(C) 2010 by Argonne National Laboratory. See COPYRIGHT in top-level directory. Automatically generated by: ./maint/extractcvars at: Wed Nov 13 03:23:43 2019 UTC DO NOT EDIT!!! This file lists the various environment variables available to change the behavior of the MPICH library. These are intended to be used by advanced users. --------------------------------------------------------------------------- MPIR_CVAR_ALLGATHER_SHORT_MSG_SIZE Aliases: MPIR_PARAM_ALLGATHER_SHORT_MSG_SIZE MPICH_ALLGATHER_SHORT_MSG_SIZE Description: For MPI_Allgather and MPI_Allgatherv, the short message algorithm will be used if the send buffer size is < this value (in bytes). (See also: MPIR_CVAR_ALLGATHER_LONG_MSG_SIZE) Default: 81920 MPIR_CVAR_ALLGATHER_LONG_MSG_SIZE Aliases: MPIR_PARAM_ALLGATHER_LONG_MSG_SIZE MPICH_ALLGATHER_LONG_MSG_SIZE Description: For MPI_Allgather and MPI_Allgatherv, the long message algorithm will be used if the send buffer size is >= this value (in bytes) (See also: MPIR_CVAR_ALLGATHER_SHORT_MSG_SIZE) Default: 524288 MPIR_CVAR_ALLGATHER_INTRA_ALGORITHM Aliases: MPIR_PARAM_ALLGATHER_INTRA_ALGORITHM MPICH_ALLGATHER_INTRA_ALGORITHM Description: Variable to select allgather algorithm auto - Internal algorithm selection brucks - Force brucks algorithm nb - Force nonblocking algorithm recursive_doubling - Force recursive doubling algorithm ring - Force ring algorithm Default: "auto" MPIR_CVAR_ALLGATHER_INTER_ALGORITHM Aliases: MPIR_PARAM_ALLGATHER_INTER_ALGORITHM MPICH_ALLGATHER_INTER_ALGORITHM Description: Variable to select allgather algorithm auto - Internal algorithm selection local_gather_remote_bcast - Force local-gather-remote-bcast algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_ALLGATHER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ALLGATHER_DEVICE_COLLECTIVE MPICH_ALLGATHER_DEVICE_COLLECTIVE Description: If set to true, MPI_Allgather will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level allgather function will not be called. Default: 1 MPIR_CVAR_ALLGATHERV_PIPELINE_MSG_SIZE Aliases: MPIR_PARAM_ALLGATHERV_PIPELINE_MSG_SIZE MPICH_ALLGATHERV_PIPELINE_MSG_SIZE Description: The smallest message size that will be used for the pipelined, large-message, ring algorithm in the MPI_Allgatherv implementation. Default: 32768 MPIR_CVAR_ALLGATHERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_ALLGATHERV_INTRA_ALGORITHM MPICH_ALLGATHERV_INTRA_ALGORITHM Description: Variable to select allgatherv algorithm auto - Internal algorithm selection brucks - Force brucks algorithm nb - Force nonblocking algorithm recursive_doubling - Force recursive doubling algorithm ring - Force ring algorithm Default: "auto" MPIR_CVAR_ALLGATHERV_INTER_ALGORITHM Aliases: MPIR_PARAM_ALLGATHERV_INTER_ALGORITHM MPICH_ALLGATHERV_INTER_ALGORITHM Description: Variable to select allgatherv algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm remote_gather_local_bcast - Force remote-gather-local-bcast algorithm Default: "auto" MPIR_CVAR_ALLGATHERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ALLGATHERV_DEVICE_COLLECTIVE MPICH_ALLGATHERV_DEVICE_COLLECTIVE Description: If set to true, MPI_Allgatherv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level allgatherv function will not be called. Default: 1 MPIR_CVAR_ALLREDUCE_SHORT_MSG_SIZE Aliases: MPIR_PARAM_ALLREDUCE_SHORT_MSG_SIZE MPICH_ALLREDUCE_SHORT_MSG_SIZE Description: the short message algorithm will be used if the send buffer size is <= this value (in bytes) Default: 2048 MPIR_CVAR_ENABLE_SMP_COLLECTIVES Aliases: MPIR_PARAM_ENABLE_SMP_COLLECTIVES MPICH_ENABLE_SMP_COLLECTIVES Description: Enable SMP aware collective communication. Default: 1 MPIR_CVAR_ENABLE_SMP_ALLREDUCE Aliases: MPIR_PARAM_ENABLE_SMP_ALLREDUCE MPICH_ENABLE_SMP_ALLREDUCE Description: Enable SMP aware allreduce. Default: 1 MPIR_CVAR_MAX_SMP_ALLREDUCE_MSG_SIZE Aliases: MPIR_PARAM_MAX_SMP_ALLREDUCE_MSG_SIZE MPICH_MAX_SMP_ALLREDUCE_MSG_SIZE Description: Maximum message size for which SMP-aware allreduce is used. A value of '0' uses SMP-aware allreduce for all message sizes. Default: 0 MPIR_CVAR_ALLREDUCE_INTRA_ALGORITHM Aliases: MPIR_PARAM_ALLREDUCE_INTRA_ALGORITHM MPICH_ALLREDUCE_INTRA_ALGORITHM Description: Variable to select allreduce algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm recursive_doubling - Force recursive doubling algorithm reduce_scatter_allgather - Force reduce scatter allgather algorithm Default: "auto" MPIR_CVAR_ALLREDUCE_INTER_ALGORITHM Aliases: MPIR_PARAM_ALLREDUCE_INTER_ALGORITHM MPICH_ALLREDUCE_INTER_ALGORITHM Description: Variable to select allreduce algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm reduce_exchange_bcast - Force reduce-exchange-bcast algorithm Default: "auto" MPIR_CVAR_ALLREDUCE_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ALLREDUCE_DEVICE_COLLECTIVE MPICH_ALLREDUCE_DEVICE_COLLECTIVE Description: If set to true, MPI_Allreduce will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level allreduce function will not be called. Default: 1 MPIR_CVAR_ALLTOALL_SHORT_MSG_SIZE Aliases: MPIR_PARAM_ALLTOALL_SHORT_MSG_SIZE MPICH_ALLTOALL_SHORT_MSG_SIZE Description: the short message algorithm will be used if the per-destination message size (sendcount*size(sendtype)) is <= this value (See also: MPIR_CVAR_ALLTOALL_MEDIUM_MSG_SIZE) Default: 256 MPIR_CVAR_ALLTOALL_MEDIUM_MSG_SIZE Aliases: MPIR_PARAM_ALLTOALL_MEDIUM_MSG_SIZE MPICH_ALLTOALL_MEDIUM_MSG_SIZE Description: the medium message algorithm will be used if the per-destination message size (sendcount*size(sendtype)) is <= this value and larger than MPIR_CVAR_ALLTOALL_SHORT_MSG_SIZE (See also: MPIR_CVAR_ALLTOALL_SHORT_MSG_SIZE) Default: 32768 MPIR_CVAR_ALLTOALL_THROTTLE Aliases: MPIR_PARAM_ALLTOALL_THROTTLE MPICH_ALLTOALL_THROTTLE Description: max no. of irecvs/isends posted at a time in some alltoall algorithms. Setting it to 0 causes all irecvs/isends to be posted at once Default: 32 MPIR_CVAR_ALLTOALL_INTRA_ALGORITHM Aliases: MPIR_PARAM_ALLTOALL_INTRA_ALGORITHM MPICH_ALLTOALL_INTRA_ALGORITHM Description: Variable to select alltoall algorithm auto - Internal algorithm selection brucks - Force brucks algorithm nb - Force nonblocking algorithm pairwise - Force pairwise algorithm pairwise_sendrecv_replace - Force pairwise sendrecv replace algorithm scattered - Force scattered algorithm Default: "auto" MPIR_CVAR_ALLTOALL_INTER_ALGORITHM Aliases: MPIR_PARAM_ALLTOALL_INTER_ALGORITHM MPICH_ALLTOALL_INTER_ALGORITHM Description: Variable to select alltoall algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm pairwise_exchange - Force pairwise exchange algorithm Default: "auto" MPIR_CVAR_ALLTOALL_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ALLTOALL_DEVICE_COLLECTIVE MPICH_ALLTOALL_DEVICE_COLLECTIVE Description: If set to true, MPI_Alltoall will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level alltoall function will not be called. Default: 1 MPIR_CVAR_ALLTOALLV_INTRA_ALGORITHM Aliases: MPIR_PARAM_ALLTOALLV_INTRA_ALGORITHM MPICH_ALLTOALLV_INTRA_ALGORITHM Description: Variable to select alltoallv algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm pairwise_sendrecv_replace - Force pairwise_sendrecv_replace algorithm scattered - Force scattered algorithm Default: "auto" MPIR_CVAR_ALLTOALLV_INTER_ALGORITHM Aliases: MPIR_PARAM_ALLTOALLV_INTER_ALGORITHM MPICH_ALLTOALLV_INTER_ALGORITHM Description: Variable to select alltoallv algorithm auto - Internal algorithm selection pairwise_exchange - Force pairwise exchange algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_ALLTOALLV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ALLTOALLV_DEVICE_COLLECTIVE MPICH_ALLTOALLV_DEVICE_COLLECTIVE Description: If set to true, MPI_Alltoallv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level alltoallv function will not be called. Default: 1 MPIR_CVAR_ALLTOALLW_INTRA_ALGORITHM Aliases: MPIR_PARAM_ALLTOALLW_INTRA_ALGORITHM MPICH_ALLTOALLW_INTRA_ALGORITHM Description: Variable to select alltoallw algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm pairwise_sendrecv_replace - Force pairwise sendrecv replace algorithm scattered - Force scattered algorithm Default: "auto" MPIR_CVAR_ALLTOALLW_INTER_ALGORITHM Aliases: MPIR_PARAM_ALLTOALLW_INTER_ALGORITHM MPICH_ALLTOALLW_INTER_ALGORITHM Description: Variable to select alltoallw algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm pairwise_exchange - Force pairwise exchange algorithm Default: "auto" MPIR_CVAR_ALLTOALLW_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ALLTOALLW_DEVICE_COLLECTIVE MPICH_ALLTOALLW_DEVICE_COLLECTIVE Description: If set to true, MPI_Alltoallw will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level alltoallw function will not be called. Default: 1 MPIR_CVAR_ENABLE_SMP_BARRIER Aliases: MPIR_PARAM_ENABLE_SMP_BARRIER MPICH_ENABLE_SMP_BARRIER Description: Enable SMP aware barrier. Default: 1 MPIR_CVAR_BARRIER_INTRA_ALGORITHM Aliases: MPIR_PARAM_BARRIER_INTRA_ALGORITHM MPICH_BARRIER_INTRA_ALGORITHM Description: Variable to select barrier algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm recursive_doubling - Force recursive doubling algorithm Default: "auto" MPIR_CVAR_BARRIER_INTER_ALGORITHM Aliases: MPIR_PARAM_BARRIER_INTER_ALGORITHM MPICH_BARRIER_INTER_ALGORITHM Description: Variable to select barrier algorithm auto - Internal algorithm selection bcast - Force bcast algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_BARRIER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_BARRIER_DEVICE_COLLECTIVE MPICH_BARRIER_DEVICE_COLLECTIVE Description: If set to true, MPI_Barrier will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level barrier function will not be called. Default: 1 MPIR_CVAR_BCAST_MIN_PROCS Aliases: MPIR_PARAM_BCAST_MIN_PROCS MPICH_BCAST_MIN_PROCS Description: Let's define short messages as messages with size < MPIR_CVAR_BCAST_SHORT_MSG_SIZE, and medium messages as messages with size >= MPIR_CVAR_BCAST_SHORT_MSG_SIZE but < MPIR_CVAR_BCAST_LONG_MSG_SIZE, and long messages as messages with size >= MPIR_CVAR_BCAST_LONG_MSG_SIZE. The broadcast algorithms selection procedure is as follows. For short messages or when the number of processes is < MPIR_CVAR_BCAST_MIN_PROCS, we do broadcast using the binomial tree algorithm. Otherwise, for medium messages and with a power-of-two number of processes, we do broadcast based on a scatter followed by a recursive doubling allgather algorithm. Otherwise, for long messages or with non power-of-two number of processes, we do broadcast based on a scatter followed by a ring allgather algorithm. (See also: MPIR_CVAR_BCAST_SHORT_MSG_SIZE, MPIR_CVAR_BCAST_LONG_MSG_SIZE) Default: 8 MPIR_CVAR_BCAST_SHORT_MSG_SIZE Aliases: MPIR_PARAM_BCAST_SHORT_MSG_SIZE MPICH_BCAST_SHORT_MSG_SIZE Description: Let's define short messages as messages with size < MPIR_CVAR_BCAST_SHORT_MSG_SIZE, and medium messages as messages with size >= MPIR_CVAR_BCAST_SHORT_MSG_SIZE but < MPIR_CVAR_BCAST_LONG_MSG_SIZE, and long messages as messages with size >= MPIR_CVAR_BCAST_LONG_MSG_SIZE. The broadcast algorithms selection procedure is as follows. For short messages or when the number of processes is < MPIR_CVAR_BCAST_MIN_PROCS, we do broadcast using the binomial tree algorithm. Otherwise, for medium messages and with a power-of-two number of processes, we do broadcast based on a scatter followed by a recursive doubling allgather algorithm. Otherwise, for long messages or with non power-of-two number of processes, we do broadcast based on a scatter followed by a ring allgather algorithm. (See also: MPIR_CVAR_BCAST_MIN_PROCS, MPIR_CVAR_BCAST_LONG_MSG_SIZE) Default: 12288 MPIR_CVAR_BCAST_LONG_MSG_SIZE Aliases: MPIR_PARAM_BCAST_LONG_MSG_SIZE MPICH_BCAST_LONG_MSG_SIZE Description: Let's define short messages as messages with size < MPIR_CVAR_BCAST_SHORT_MSG_SIZE, and medium messages as messages with size >= MPIR_CVAR_BCAST_SHORT_MSG_SIZE but < MPIR_CVAR_BCAST_LONG_MSG_SIZE, and long messages as messages with size >= MPIR_CVAR_BCAST_LONG_MSG_SIZE. The broadcast algorithms selection procedure is as follows. For short messages or when the number of processes is < MPIR_CVAR_BCAST_MIN_PROCS, we do broadcast using the binomial tree algorithm. Otherwise, for medium messages and with a power-of-two number of processes, we do broadcast based on a scatter followed by a recursive doubling allgather algorithm. Otherwise, for long messages or with non power-of-two number of processes, we do broadcast based on a scatter followed by a ring allgather algorithm. (See also: MPIR_CVAR_BCAST_MIN_PROCS, MPIR_CVAR_BCAST_SHORT_MSG_SIZE) Default: 524288 MPIR_CVAR_ENABLE_SMP_BCAST Aliases: MPIR_PARAM_ENABLE_SMP_BCAST MPICH_ENABLE_SMP_BCAST Description: Enable SMP aware broadcast (See also: MPIR_CVAR_MAX_SMP_BCAST_MSG_SIZE) Default: 1 MPIR_CVAR_MAX_SMP_BCAST_MSG_SIZE Aliases: MPIR_PARAM_MAX_SMP_BCAST_MSG_SIZE MPICH_MAX_SMP_BCAST_MSG_SIZE Description: Maximum message size for which SMP-aware broadcast is used. A value of '0' uses SMP-aware broadcast for all message sizes. (See also: MPIR_CVAR_ENABLE_SMP_BCAST) Default: 0 MPIR_CVAR_BCAST_INTRA_ALGORITHM Aliases: MPIR_PARAM_BCAST_INTRA_ALGORITHM MPICH_BCAST_INTRA_ALGORITHM Description: Variable to select bcast algorithm auto - Internal algorithm selection binomial - Force Binomial Tree nb - Force nonblocking algorithm scatter_recursive_doubling_allgather - Force Scatter Recursive-Doubling Allgather scatter_ring_allgather - Force Scatter Ring Default: "auto" MPIR_CVAR_BCAST_INTER_ALGORITHM Aliases: MPIR_PARAM_BCAST_INTER_ALGORITHM MPICH_BCAST_INTER_ALGORITHM Description: Variable to select bcast algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm remote_send_local_bcast - Force remote-send-local-bcast algorithm Default: "auto" MPIR_CVAR_BCAST_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_BCAST_DEVICE_COLLECTIVE MPICH_BCAST_DEVICE_COLLECTIVE Description: If set to true, MPI_Bcast will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level bcast function will not be called. Default: 1 MPIR_CVAR_EXSCAN_INTRA_ALGORITHM Aliases: MPIR_PARAM_EXSCAN_INTRA_ALGORITHM MPICH_EXSCAN_INTRA_ALGORITHM Description: Variable to select allgather algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm recursive_doubling - Force recursive doubling algorithm Default: "auto" MPIR_CVAR_EXSCAN_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_EXSCAN_DEVICE_COLLECTIVE MPICH_EXSCAN_DEVICE_COLLECTIVE Description: If set to true, MPI_Exscan will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level exscan function will not be called. Default: 1 MPIR_CVAR_GATHER_INTER_SHORT_MSG_SIZE Aliases: MPIR_PARAM_GATHER_INTER_SHORT_MSG_SIZE MPICH_GATHER_INTER_SHORT_MSG_SIZE Description: use the short message algorithm for intercommunicator MPI_Gather if the send buffer size is < this value (in bytes) (See also: MPIR_CVAR_GATHER_VSMALL_MSG_SIZE) Default: 2048 MPIR_CVAR_GATHER_INTRA_ALGORITHM Aliases: MPIR_PARAM_GATHER_INTRA_ALGORITHM MPICH_GATHER_INTRA_ALGORITHM Description: Variable to select gather algorithm auto - Internal algorithm selection binomial - Force binomial algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_GATHER_INTER_ALGORITHM Aliases: MPIR_PARAM_GATHER_INTER_ALGORITHM MPICH_GATHER_INTER_ALGORITHM Description: Variable to select gather algorithm auto - Internal algorithm selection linear - Force linear algorithm local_gather_remote_send - Force local-gather-remote-send algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_GATHER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_GATHER_DEVICE_COLLECTIVE MPICH_GATHER_DEVICE_COLLECTIVE Description: If set to true, MPI_Gather will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level gather function will not be called. Default: 1 MPIR_CVAR_GATHER_VSMALL_MSG_SIZE Aliases: MPIR_PARAM_GATHER_VSMALL_MSG_SIZE MPICH_GATHER_VSMALL_MSG_SIZE Description: use a temporary buffer for intracommunicator MPI_Gather if the send buffer size is < this value (in bytes) (See also: MPIR_CVAR_GATHER_INTER_SHORT_MSG_SIZE) Default: 1024 MPIR_CVAR_GATHERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_GATHERV_INTRA_ALGORITHM MPICH_GATHERV_INTRA_ALGORITHM Description: Variable to select gatherv algorithm auto - Internal algorithm selection linear - Force linear algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_GATHERV_INTER_ALGORITHM Aliases: MPIR_PARAM_GATHERV_INTER_ALGORITHM MPICH_GATHERV_INTER_ALGORITHM Description: Variable to select gatherv algorithm auto - Internal algorithm selection linear - Force linear algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_GATHERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_GATHERV_DEVICE_COLLECTIVE MPICH_GATHERV_DEVICE_COLLECTIVE Description: If set to true, MPI_Gatherv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level gatherv function will not be called. Default: 1 MPIR_CVAR_GATHERV_INTER_SSEND_MIN_PROCS Aliases: MPIR_PARAM_GATHERV_INTER_SSEND_MIN_PROCS MPICH_GATHERV_INTER_SSEND_MIN_PROCS Description: Use Ssend (synchronous send) for intercommunicator MPI_Gatherv if the "group B" size is >= this value. Specifying "-1" always avoids using Ssend. For backwards compatibility, specifying "0" uses the default value. Default: 32 MPIR_CVAR_IALLGATHER_RECEXCH_KVAL Aliases: MPIR_PARAM_IALLGATHER_RECEXCH_KVAL MPICH_IALLGATHER_RECEXCH_KVAL Description: k value for recursive exchange based iallgather Default: 2 MPIR_CVAR_IALLGATHER_BRUCKS_KVAL Aliases: MPIR_PARAM_IALLGATHER_BRUCKS_KVAL MPICH_IALLGATHER_BRUCKS_KVAL Description: k value for radix in brucks based iallgather Default: 2 MPIR_CVAR_IALLGATHER_INTRA_ALGORITHM Aliases: MPIR_PARAM_IALLGATHER_INTRA_ALGORITHM MPICH_IALLGATHER_INTRA_ALGORITHM Description: Variable to select iallgather algorithm auto - Internal algorithm selection brucks - Force brucks algorithm recursive_doubling - Force recursive doubling algorithm ring - Force ring algorithm recexch_distance_doubling - Force generic transport recursive exchange with neighbours doubling in distance in each phase recexch_distance_halving - Force generic transport recursive exchange with neighbours halving in distance in each phase gentran_brucks - Force generic transport based brucks algorithm Default: "auto" MPIR_CVAR_IALLGATHER_INTER_ALGORITHM Aliases: MPIR_PARAM_IALLGATHER_INTER_ALGORITHM MPICH_IALLGATHER_INTER_ALGORITHM Description: Variable to select iallgather algorithm auto - Internal algorithm selection local_gather_remote_bcast - Force local-gather-remote-bcast algorithm Default: "auto" MPIR_CVAR_IALLGATHER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IALLGATHER_DEVICE_COLLECTIVE MPICH_IALLGATHER_DEVICE_COLLECTIVE Description: If set to true, MPI_Iallgather will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level iallgather function will not be called. Default: 1 MPIR_CVAR_IALLGATHERV_RECEXCH_KVAL Aliases: MPIR_PARAM_IALLGATHERV_RECEXCH_KVAL MPICH_IALLGATHERV_RECEXCH_KVAL Description: k value for recursive exchange based iallgatherv Default: 2 MPIR_CVAR_IALLGATHERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_IALLGATHERV_INTRA_ALGORITHM MPICH_IALLGATHERV_INTRA_ALGORITHM Description: Variable to select iallgatherv algorithm auto - Internal algorithm selection brucks - Force brucks algorithm recursive_doubling - Force recursive doubling algorithm ring - Force ring algorithm recexch_distance_doubling - Force generic transport recursive exchange with neighbours doubling in distance in each phase recexch_distance_halving - Force generic transport recursive exchange with neighbours halving in distance in each phase gentran_ring - Force generic transport ring algorithm Default: "auto" MPIR_CVAR_IALLGATHERV_INTER_ALGORITHM Aliases: MPIR_PARAM_IALLGATHERV_INTER_ALGORITHM MPICH_IALLGATHERV_INTER_ALGORITHM Description: Variable to select iallgatherv algorithm auto - Internal algorithm selection remote_gather_local_bcast - Force remote-gather-local-bcast algorithm Default: "auto" MPIR_CVAR_IALLGATHERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IALLGATHERV_DEVICE_COLLECTIVE MPICH_IALLGATHERV_DEVICE_COLLECTIVE Description: If set to true, MPI_Iallgatherv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level iallgatherv function will not be called. Default: 1 MPIR_CVAR_IALLREDUCE_TREE_KVAL Aliases: MPIR_PARAM_IALLREDUCE_TREE_KVAL MPICH_IALLREDUCE_TREE_KVAL Description: k value for tree based iallreduce (for tree_kary and tree_knomial) Default: 2 MPIR_CVAR_IALLREDUCE_TREE_PIPELINE_CHUNK_SIZE Aliases: MPIR_PARAM_IALLREDUCE_TREE_PIPELINE_CHUNK_SIZE MPICH_IALLREDUCE_TREE_PIPELINE_CHUNK_SIZE Description: Maximum chunk size (in bytes) for pipelining in tree based iallreduce (tree_kary and tree_knomial). Default value is 0, that is, no pipelining by default Default: -1 MPIR_CVAR_IALLREDUCE_TREE_BUFFER_PER_CHILD Aliases: MPIR_PARAM_IALLREDUCE_TREE_BUFFER_PER_CHILD MPICH_IALLREDUCE_TREE_BUFFER_PER_CHILD Description: If set to true, a rank in tree_kary and tree_knomial algorithms will allocate a dedicated buffer for every child it receives data from. This would mean more memory consumption but it would allow preposting of the receives and hence reduce the number of unexpected messages. If set to false, there is only one buffer that is used to receive the data from all the children. The receives are therefore serialized, that is, only one receive can be posted at a time. Default: 0 MPIR_CVAR_IALLREDUCE_RECEXCH_KVAL Aliases: MPIR_PARAM_IALLREDUCE_RECEXCH_KVAL MPICH_IALLREDUCE_RECEXCH_KVAL Description: k value for recursive exchange based iallreduce Default: 2 MPIR_CVAR_IALLREDUCE_INTRA_ALGORITHM Aliases: MPIR_PARAM_IALLREDUCE_INTRA_ALGORITHM MPICH_IALLREDUCE_INTRA_ALGORITHM Description: Variable to select iallreduce algorithm auto - Internal algorithm selection naive - Force naive algorithm recursive_doubling - Force recursive doubling algorithm reduce_scatter_allgather - Force reduce scatter allgather algorithm recexch_single_buffer - Force generic transport recursive exchange with single buffer for receives recexch_multiple_buffer - Force generic transport recursive exchange with multiple buffers for receives Default: "auto" MPIR_CVAR_IALLREDUCE_INTER_ALGORITHM Aliases: MPIR_PARAM_IALLREDUCE_INTER_ALGORITHM MPICH_IALLREDUCE_INTER_ALGORITHM Description: Variable to select iallreduce algorithm auto - Internal algorithm selection remote_reduce_local_bcast - Force remote-reduce-local-bcast algorithm Default: "auto" MPIR_CVAR_IALLREDUCE_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IALLREDUCE_DEVICE_COLLECTIVE MPICH_IALLREDUCE_DEVICE_COLLECTIVE Description: If set to true, MPI_Iallreduce will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level iallreduce function will not be called. Default: 1 MPIR_CVAR_IALLTOALL_INTRA_ALGORITHM Aliases: MPIR_PARAM_IALLTOALL_INTRA_ALGORITHM MPICH_IALLTOALL_INTRA_ALGORITHM Description: Variable to select ialltoall algorithm auto - Internal algorithm selection brucks - Force brucks algorithm inplace - Force inplace algorithm pairwise - Force pairwise algorithm permuted_sendrecv - Force permuted sendrecv algorithm Default: "auto" MPIR_CVAR_IALLTOALL_INTER_ALGORITHM Aliases: MPIR_PARAM_IALLTOALL_INTER_ALGORITHM MPICH_IALLTOALL_INTER_ALGORITHM Description: Variable to select ialltoall algorithm auto - Internal algorithm selection pairwise_exchange - Force pairwise exchange algorithm Default: "auto" MPIR_CVAR_IALLTOALL_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IALLTOALL_DEVICE_COLLECTIVE MPICH_IALLTOALL_DEVICE_COLLECTIVE Description: If set to true, MPI_Ialltoall will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ialltoall function will not be called. Default: 1 MPIR_CVAR_IALLTOALLV_INTRA_ALGORITHM Aliases: MPIR_PARAM_IALLTOALLV_INTRA_ALGORITHM MPICH_IALLTOALLV_INTRA_ALGORITHM Description: Variable to select ialltoallv algorithm auto - Internal algorithm selection blocked - Force blocked algorithm inplace - Force inplace algorithm pairwise_exchange - Force pairwise exchange algorithm Default: "auto" MPIR_CVAR_IALLTOALLV_INTER_ALGORITHM Aliases: MPIR_PARAM_IALLTOALLV_INTER_ALGORITHM MPICH_IALLTOALLV_INTER_ALGORITHM Description: Variable to select ialltoallv algorithm auto - Internal algorithm selection Default: "auto" MPIR_CVAR_IALLTOALLV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IALLTOALLV_DEVICE_COLLECTIVE MPICH_IALLTOALLV_DEVICE_COLLECTIVE Description: If set to true, MPI_Ialltoallv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ialltoallv function will not be called. Default: 1 MPIR_CVAR_IALLTOALLW_INTRA_ALGORITHM Aliases: MPIR_PARAM_IALLTOALLW_INTRA_ALGORITHM MPICH_IALLTOALLW_INTRA_ALGORITHM Description: Variable to select ialltoallw algorithm auto - Internal algorithm selection blocked - Force blocked algorithm inplace - Force inplace algorithm pairwise_exchange - Force pairwise exchange algorithm Default: "auto" MPIR_CVAR_IALLTOALLW_INTER_ALGORITHM Aliases: MPIR_PARAM_IALLTOALLW_INTER_ALGORITHM MPICH_IALLTOALLW_INTER_ALGORITHM Description: Variable to select ialltoallw algorithm auto - Internal algorithm selection Default: "auto" MPIR_CVAR_IALLTOALLW_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IALLTOALLW_DEVICE_COLLECTIVE MPICH_IALLTOALLW_DEVICE_COLLECTIVE Description: If set to true, MPI_Ialltoallw will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ialltoallw function will not be called. Default: 1 MPIR_CVAR_IBARRIER_RECEXCH_KVAL Aliases: MPIR_PARAM_IBARRIER_RECEXCH_KVAL MPICH_IBARRIER_RECEXCH_KVAL Description: k value for recursive exchange based ibarrier Default: 2 MPIR_CVAR_IBARRIER_INTRA_ALGORITHM Aliases: MPIR_PARAM_IBARRIER_INTRA_ALGORITHM MPICH_IBARRIER_INTRA_ALGORITHM Description: Variable to select ibarrier algorithm auto - Internal algorithm selection recursive_doubling - Force recursive doubling algorithm recexch - Force generic transport based recursive exchange algorithm Default: "auto" MPIR_CVAR_IBARRIER_INTER_ALGORITHM Aliases: MPIR_PARAM_IBARRIER_INTER_ALGORITHM MPICH_IBARRIER_INTER_ALGORITHM Description: Variable to select ibarrier algorithm auto - Internal algorithm selection bcast - Force bcast algorithm Default: "auto" MPIR_CVAR_IBARRIER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IBARRIER_DEVICE_COLLECTIVE MPICH_IBARRIER_DEVICE_COLLECTIVE Description: If set to true, MPI_Ibarrier will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ibarrier function will not be called. Default: 1 MPIR_CVAR_IBCAST_TREE_KVAL Aliases: MPIR_PARAM_IBCAST_TREE_KVAL MPICH_IBCAST_TREE_KVAL Description: k value for tree (kary, knomial, etc.) based ibcast Default: 2 MPIR_CVAR_IBCAST_TREE_TYPE Aliases: MPIR_PARAM_IBCAST_TREE_TYPE MPICH_IBCAST_TREE_TYPE Description: Tree type for tree based ibcast kary - kary tree type knomial_1 - knomial_1 tree type knomial_2 - knomial_2 tree type Default: "kary" MPIR_CVAR_IBCAST_TREE_PIPELINE_CHUNK_SIZE Aliases: MPIR_PARAM_IBCAST_TREE_PIPELINE_CHUNK_SIZE MPICH_IBCAST_TREE_PIPELINE_CHUNK_SIZE Description: Maximum chunk size (in bytes) for pipelining in tree based ibcast. Default value is 0, that is, no pipelining by default Default: 0 MPIR_CVAR_IBCAST_RING_CHUNK_SIZE Aliases: MPIR_PARAM_IBCAST_RING_CHUNK_SIZE MPICH_IBCAST_RING_CHUNK_SIZE Description: Maximum chunk size (in bytes) for pipelining in ibcast ring algorithm. Default value is 0, that is, no pipelining by default Default: 0 MPIR_CVAR_IBCAST_INTRA_ALGORITHM Aliases: MPIR_PARAM_IBCAST_INTRA_ALGORITHM MPICH_IBCAST_INTRA_ALGORITHM Description: Variable to select ibcast algorithm auto - Internal algorithm selection binomial - Force Binomial algorithm scatter_recursive_doubling_allgather - Force Scatter Recursive Doubling Allgather algorithm scatter_ring_allgather - Force Scatter Ring Allgather algorithm tree - Force Generic Transport Tree algorithm scatter_recexch_allgather - Force Generic Transport Scatter followed by Recursive Exchange Allgather algorithm ring - Force Generic Transport Ring algorithm Default: "auto" MPIR_CVAR_IBCAST_SCATTER_KVAL Aliases: MPIR_PARAM_IBCAST_SCATTER_KVAL MPICH_IBCAST_SCATTER_KVAL Description: k value for tree based scatter in scatter_recexch_allgather algorithm Default: 2 MPIR_CVAR_IBCAST_ALLGATHER_RECEXCH_KVAL Aliases: MPIR_PARAM_IBCAST_ALLGATHER_RECEXCH_KVAL MPICH_IBCAST_ALLGATHER_RECEXCH_KVAL Description: k value for recursive exchange based allgather in scatter_recexch_allgather algorithm Default: 2 MPIR_CVAR_IBCAST_INTER_ALGORITHM Aliases: MPIR_PARAM_IBCAST_INTER_ALGORITHM MPICH_IBCAST_INTER_ALGORITHM Description: Variable to select ibcast algorithm auto - Internal algorithm selection flat - Force flat algorithm Default: "auto" MPIR_CVAR_IBCAST_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IBCAST_DEVICE_COLLECTIVE MPICH_IBCAST_DEVICE_COLLECTIVE Description: If set to true, MPI_Ibcast will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ibcast function will not be called. Default: 1 MPIR_CVAR_IEXSCAN_INTRA_ALGORITHM Aliases: MPIR_PARAM_IEXSCAN_INTRA_ALGORITHM MPICH_IEXSCAN_INTRA_ALGORITHM Description: Variable to select iexscan algorithm auto - Internal algorithm selection recursive_doubling - Force recursive doubling algorithm Default: "auto" MPIR_CVAR_IEXSCAN_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IEXSCAN_DEVICE_COLLECTIVE MPICH_IEXSCAN_DEVICE_COLLECTIVE Description: If set to true, MPI_Iexscan will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level iexscan function will not be called. Default: 1 MPIR_CVAR_IGATHER_INTRA_ALGORITHM Aliases: MPIR_PARAM_IGATHER_INTRA_ALGORITHM MPICH_IGATHER_INTRA_ALGORITHM Description: Variable to select igather algorithm auto - Internal algorithm selection binomial - Force binomial algorithm tree - Force genetric transport based tree algorithm Default: "auto" MPIR_CVAR_IGATHER_TREE_KVAL Aliases: MPIR_PARAM_IGATHER_TREE_KVAL MPICH_IGATHER_TREE_KVAL Description: k value for tree based igather Default: 2 MPIR_CVAR_IGATHER_INTER_ALGORITHM Aliases: MPIR_PARAM_IGATHER_INTER_ALGORITHM MPICH_IGATHER_INTER_ALGORITHM Description: Variable to select igather algorithm auto - Internal algorithm selection long_inter - Force long inter algorithm short_inter - Force short inter algorithm Default: "auto" MPIR_CVAR_IGATHER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IGATHER_DEVICE_COLLECTIVE MPICH_IGATHER_DEVICE_COLLECTIVE Description: If set to true, MPI_Igather will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level igather function will not be called. Default: 1 MPIR_CVAR_IGATHERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_IGATHERV_INTRA_ALGORITHM MPICH_IGATHERV_INTRA_ALGORITHM Description: Variable to select igatherv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_IGATHERV_INTER_ALGORITHM Aliases: MPIR_PARAM_IGATHERV_INTER_ALGORITHM MPICH_IGATHERV_INTER_ALGORITHM Description: Variable to select igatherv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_IGATHERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IGATHERV_DEVICE_COLLECTIVE MPICH_IGATHERV_DEVICE_COLLECTIVE Description: If set to true, MPI_Igatherv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level igatherv function will not be called. Default: 1 MPIR_CVAR_INEIGHBOR_ALLGATHER_INTRA_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLGATHER_INTRA_ALGORITHM MPICH_INEIGHBOR_ALLGATHER_INTRA_ALGORITHM Description: Variable to select ineighbor_allgather algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLGATHER_INTER_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLGATHER_INTER_ALGORITHM MPICH_INEIGHBOR_ALLGATHER_INTER_ALGORITHM Description: Variable to select ineighbor_allgather algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLGATHER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_INEIGHBOR_ALLGATHER_DEVICE_COLLECTIVE MPICH_INEIGHBOR_ALLGATHER_DEVICE_COLLECTIVE Description: If set to true, MPI_ineighbor_allgather will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ineighbor_allgather function will not be called. Default: 1 MPIR_CVAR_INEIGHBOR_ALLGATHERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLGATHERV_INTRA_ALGORITHM MPICH_INEIGHBOR_ALLGATHERV_INTRA_ALGORITHM Description: Variable to select ineighbor_allgatherv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLGATHERV_INTER_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLGATHERV_INTER_ALGORITHM MPICH_INEIGHBOR_ALLGATHERV_INTER_ALGORITHM Description: Variable to select ineighbor_allgatherv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLGATHERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_INEIGHBOR_ALLGATHERV_DEVICE_COLLECTIVE MPICH_INEIGHBOR_ALLGATHERV_DEVICE_COLLECTIVE Description: If set to true, MPI_ineighbor_allgatherv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ineighbor_allgatherv function will not be called. Default: 1 MPIR_CVAR_INEIGHBOR_ALLTOALL_INTRA_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALL_INTRA_ALGORITHM MPICH_INEIGHBOR_ALLTOALL_INTRA_ALGORITHM Description: Variable to select ineighbor_alltoall algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLTOALL_INTER_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALL_INTER_ALGORITHM MPICH_INEIGHBOR_ALLTOALL_INTER_ALGORITHM Description: Variable to select ineighbor_alltoall algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLTOALL_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALL_DEVICE_COLLECTIVE MPICH_INEIGHBOR_ALLTOALL_DEVICE_COLLECTIVE Description: If set to true, MPI_ineighbor_alltoall will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ineighbor_alltoall function will not be called. Default: 1 MPIR_CVAR_INEIGHBOR_ALLTOALLV_INTRA_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALLV_INTRA_ALGORITHM MPICH_INEIGHBOR_ALLTOALLV_INTRA_ALGORITHM Description: Variable to select ineighbor_alltoallv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLTOALLV_INTER_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALLV_INTER_ALGORITHM MPICH_INEIGHBOR_ALLTOALLV_INTER_ALGORITHM Description: Variable to select ineighbor_alltoallv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLTOALLV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALLV_DEVICE_COLLECTIVE MPICH_INEIGHBOR_ALLTOALLV_DEVICE_COLLECTIVE Description: If set to true, MPI_ineighbor_alltoallv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ineighbor_alltoallv function will not be called. Default: 1 MPIR_CVAR_INEIGHBOR_ALLTOALLW_INTRA_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALLW_INTRA_ALGORITHM MPICH_INEIGHBOR_ALLTOALLW_INTRA_ALGORITHM Description: Variable to select ineighbor_alltoallw algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLTOALLW_INTER_ALGORITHM Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALLW_INTER_ALGORITHM MPICH_INEIGHBOR_ALLTOALLW_INTER_ALGORITHM Description: Variable to select ineighbor_alltoallw algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_INEIGHBOR_ALLTOALLW_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_INEIGHBOR_ALLTOALLW_DEVICE_COLLECTIVE MPICH_INEIGHBOR_ALLTOALLW_DEVICE_COLLECTIVE Description: If set to true, MPI_ineighbor_alltoallw will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ineighbor_alltoallw function will not be called. Default: 1 MPIR_CVAR_IREDUCE_TREE_KVAL Aliases: MPIR_PARAM_IREDUCE_TREE_KVAL MPICH_IREDUCE_TREE_KVAL Description: k value for tree (kary, knomial, etc.) based ireduce Default: 2 MPIR_CVAR_IREDUCE_TREE_TYPE Aliases: MPIR_PARAM_IREDUCE_TREE_TYPE MPICH_IREDUCE_TREE_TYPE Description: Tree type for tree based ireduce kary - kary tree knomial_1 - knomial_1 tree knomial_2 - knomial_2 tree Default: "kary" MPIR_CVAR_IREDUCE_TREE_PIPELINE_CHUNK_SIZE Aliases: MPIR_PARAM_IREDUCE_TREE_PIPELINE_CHUNK_SIZE MPICH_IREDUCE_TREE_PIPELINE_CHUNK_SIZE Description: Maximum chunk size (in bytes) for pipelining in tree based ireduce. Default value is 0, that is, no pipelining by default Default: -1 MPIR_CVAR_IREDUCE_RING_CHUNK_SIZE Aliases: MPIR_PARAM_IREDUCE_RING_CHUNK_SIZE MPICH_IREDUCE_RING_CHUNK_SIZE Description: Maximum chunk size (in bytes) for pipelining in ireduce ring algorithm. Default value is 0, that is, no pipelining by default Default: 0 MPIR_CVAR_IREDUCE_TREE_BUFFER_PER_CHILD Aliases: MPIR_PARAM_IREDUCE_TREE_BUFFER_PER_CHILD MPICH_IREDUCE_TREE_BUFFER_PER_CHILD Description: If set to true, a rank in tree algorithms will allocate a dedicated buffer for every child it receives data from. This would mean more memory consumption but it would allow preposting of the receives and hence reduce the number of unexpected messages. If set to false, there is only one buffer that is used to receive the data from all the children. The receives are therefore serialized, that is, only one receive can be posted at a time. Default: 0 MPIR_CVAR_IREDUCE_INTRA_ALGORITHM Aliases: MPIR_PARAM_IREDUCE_INTRA_ALGORITHM MPICH_IREDUCE_INTRA_ALGORITHM Description: Variable to select ireduce algorithm auto - Internal algorithm selection binomial - Force binomial algorithm reduce_scatter_gather - Force reduce scatter gather algorithm tree - Force Generic Transport Tree ring - Force Generic Transport Ring Default: "auto" MPIR_CVAR_IREDUCE_INTER_ALGORITHM Aliases: MPIR_PARAM_IREDUCE_INTER_ALGORITHM MPICH_IREDUCE_INTER_ALGORITHM Description: Variable to select ireduce algorithm auto - Internal algorithm selection local_reduce_remote_send - Force local-reduce-remote-send algorithm Default: "auto" MPIR_CVAR_IREDUCE_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IREDUCE_DEVICE_COLLECTIVE MPICH_IREDUCE_DEVICE_COLLECTIVE Description: If set to true, MPI_Ireduce will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ireduce function will not be called. Default: 1 MPIR_CVAR_IREDUCE_SCATTER_RECEXCH_KVAL Aliases: MPIR_PARAM_IREDUCE_SCATTER_RECEXCH_KVAL MPICH_IREDUCE_SCATTER_RECEXCH_KVAL Description: k value for recursive exchange based ireduce_scatter Default: 2 MPIR_CVAR_IREDUCE_SCATTER_INTRA_ALGORITHM Aliases: MPIR_PARAM_IREDUCE_SCATTER_INTRA_ALGORITHM MPICH_IREDUCE_SCATTER_INTRA_ALGORITHM Description: Variable to select ireduce_scatter algorithm auto - Internal algorithm selection noncommutative - Force noncommutative algorithm recursive_doubling - Force recursive doubling algorithm pairwise - Force pairwise algorithm recursive_halving - Force recursive halving algorithm recexch - Force generic transport recursive exchange algorithm Default: "auto" MPIR_CVAR_IREDUCE_SCATTER_INTER_ALGORITHM Aliases: MPIR_PARAM_IREDUCE_SCATTER_INTER_ALGORITHM MPICH_IREDUCE_SCATTER_INTER_ALGORITHM Description: Variable to select ireduce_scatter algorithm auto - Internal algorithm selection remote_reduce_local_scatterv - Force remote-reduce-local-scatterv algorithm Default: "auto" MPIR_CVAR_IREDUCE_SCATTER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IREDUCE_SCATTER_DEVICE_COLLECTIVE MPICH_IREDUCE_SCATTER_DEVICE_COLLECTIVE Description: If set to true, MPI_Ireduce_scatter will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ireduce_scatter function will not be called. Default: 1 MPIR_CVAR_IREDUCE_SCATTER_BLOCK_RECEXCH_KVAL Aliases: MPIR_PARAM_IREDUCE_SCATTER_BLOCK_RECEXCH_KVAL MPICH_IREDUCE_SCATTER_BLOCK_RECEXCH_KVAL Description: k value for recursive exchange based ireduce_scatter_block Default: 2 MPIR_CVAR_IREDUCE_SCATTER_BLOCK_INTRA_ALGORITHM Aliases: MPIR_PARAM_IREDUCE_SCATTER_BLOCK_INTRA_ALGORITHM MPICH_IREDUCE_SCATTER_BLOCK_INTRA_ALGORITHM Description: Variable to select ireduce_scatter_block algorithm auto - Internal algorithm selection noncommutative - Force noncommutative algorithm recursive_doubling - Force recursive doubling algorithm pairwise - Force pairwise algorithm recursive_halving - Force recursive halving algorithm recexch - Force generic transport recursive exchange algorithm Default: "auto" MPIR_CVAR_IREDUCE_SCATTER_BLOCK_INTER_ALGORITHM Aliases: MPIR_PARAM_IREDUCE_SCATTER_BLOCK_INTER_ALGORITHM MPICH_IREDUCE_SCATTER_BLOCK_INTER_ALGORITHM Description: Variable to select ireduce_scatter_block algorithm auto - Internal algorithm selection remote_reduce_local_scatterv - Force remote-reduce-local-scatterv algorithm Default: "auto" MPIR_CVAR_IREDUCE_SCATTER_BLOCK_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_IREDUCE_SCATTER_BLOCK_DEVICE_COLLECTIVE MPICH_IREDUCE_SCATTER_BLOCK_DEVICE_COLLECTIVE Description: If set to true, MPI_Ireduce_scatter_block will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level ireduce_scatter_block function will not be called. Default: 1 MPIR_CVAR_ISCAN_INTRA_ALGORITHM Aliases: MPIR_PARAM_ISCAN_INTRA_ALGORITHM MPICH_ISCAN_INTRA_ALGORITHM Description: Variable to select allgather algorithm auto - Internal algorithm selection recursive_doubling - Force recursive doubling algorithm Default: "auto" MPIR_CVAR_ISCAN_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ISCAN_DEVICE_COLLECTIVE MPICH_ISCAN_DEVICE_COLLECTIVE Description: If set to true, MPI_Iscan will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level iscan function will not be called. Default: 1 MPIR_CVAR_ISCATTER_INTRA_ALGORITHM Aliases: MPIR_PARAM_ISCATTER_INTRA_ALGORITHM MPICH_ISCATTER_INTRA_ALGORITHM Description: Variable to select iscatter algorithm auto - Internal algorithm selection binomial - Force binomial algorithm tree - Force genetric transport based tree algorithm Default: "auto" MPIR_CVAR_ISCATTER_TREE_KVAL Aliases: MPIR_PARAM_ISCATTER_TREE_KVAL MPICH_ISCATTER_TREE_KVAL Description: k value for tree based iscatter Default: 2 MPIR_CVAR_ISCATTER_INTER_ALGORITHM Aliases: MPIR_PARAM_ISCATTER_INTER_ALGORITHM MPICH_ISCATTER_INTER_ALGORITHM Description: Variable to select iscatter algorithm auto - Internal algorithm selection linear - Force linear algorithm remote_send_local_scatter - Force remote-send-local-scatter algorithm Default: "auto" MPIR_CVAR_ISCATTER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ISCATTER_DEVICE_COLLECTIVE MPICH_ISCATTER_DEVICE_COLLECTIVE Description: If set to true, MPI_Iscatter will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level iscatter function will not be called. Default: 1 MPIR_CVAR_ISCATTERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_ISCATTERV_INTRA_ALGORITHM MPICH_ISCATTERV_INTRA_ALGORITHM Description: Variable to select iscatterv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_ISCATTERV_INTER_ALGORITHM Aliases: MPIR_PARAM_ISCATTERV_INTER_ALGORITHM MPICH_ISCATTERV_INTER_ALGORITHM Description: Variable to select iscatterv algorithm auto - Internal algorithm selection linear - Force linear algorithm Default: "auto" MPIR_CVAR_ISCATTERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_ISCATTERV_DEVICE_COLLECTIVE MPICH_ISCATTERV_DEVICE_COLLECTIVE Description: If set to true, MPI_Iscatterv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level iscatterv function will not be called. Default: 1 MPIR_CVAR_NEIGHBOR_ALLGATHER_INTRA_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLGATHER_INTRA_ALGORITHM MPICH_NEIGHBOR_ALLGATHER_INTRA_ALGORITHM Description: Variable to select ineighbor_allgather algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLGATHER_INTER_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLGATHER_INTER_ALGORITHM MPICH_NEIGHBOR_ALLGATHER_INTER_ALGORITHM Description: Variable to select ineighbor_allgather algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLGATHER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_NEIGHBOR_ALLGATHER_DEVICE_COLLECTIVE MPICH_NEIGHBOR_ALLGATHER_DEVICE_COLLECTIVE Description: If set to true, MPI_neighbor_allgather will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level neighbor_allgather function will not be called. Default: 1 MPIR_CVAR_NEIGHBOR_ALLGATHERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLGATHERV_INTRA_ALGORITHM MPICH_NEIGHBOR_ALLGATHERV_INTRA_ALGORITHM Description: Variable to select neighbor_allgatherv algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLGATHERV_INTER_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLGATHERV_INTER_ALGORITHM MPICH_NEIGHBOR_ALLGATHERV_INTER_ALGORITHM Description: Variable to select neighbor_allgatherv algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLGATHERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_NEIGHBOR_ALLGATHERV_DEVICE_COLLECTIVE MPICH_NEIGHBOR_ALLGATHERV_DEVICE_COLLECTIVE Description: If set to true, MPI_neighbor_allgatherv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level neighbor_allgatherv function will not be called. Default: 1 MPIR_CVAR_NEIGHBOR_ALLTOALL_INTRA_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALL_INTRA_ALGORITHM MPICH_NEIGHBOR_ALLTOALL_INTRA_ALGORITHM Description: Variable to select neighbor_alltoall algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLTOALL_INTER_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALL_INTER_ALGORITHM MPICH_NEIGHBOR_ALLTOALL_INTER_ALGORITHM Description: Variable to select neighbor_alltoall algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLTOALL_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALL_DEVICE_COLLECTIVE MPICH_NEIGHBOR_ALLTOALL_DEVICE_COLLECTIVE Description: If set to true, MPI_neighbor_alltoall will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level neighbor_alltoall function will not be called. Default: 1 MPIR_CVAR_NEIGHBOR_ALLTOALLV_INTRA_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALLV_INTRA_ALGORITHM MPICH_NEIGHBOR_ALLTOALLV_INTRA_ALGORITHM Description: Variable to select neighbor_alltoallv algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLTOALLV_INTER_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALLV_INTER_ALGORITHM MPICH_NEIGHBOR_ALLTOALLV_INTER_ALGORITHM Description: Variable to select neighbor_alltoallv algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLTOALLV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALLV_DEVICE_COLLECTIVE MPICH_NEIGHBOR_ALLTOALLV_DEVICE_COLLECTIVE Description: If set to true, MPI_neighbor_alltoallv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level neighbor_alltoallv function will not be called. Default: 1 MPIR_CVAR_NEIGHBOR_ALLTOALLW_INTRA_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALLW_INTRA_ALGORITHM MPICH_NEIGHBOR_ALLTOALLW_INTRA_ALGORITHM Description: Variable to select neighbor_alltoallw algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLTOALLW_INTER_ALGORITHM Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALLW_INTER_ALGORITHM MPICH_NEIGHBOR_ALLTOALLW_INTER_ALGORITHM Description: Variable to select neighbor_alltoallw algorithm auto - Internal algorithm selection nb - Force nb algorithm Default: "auto" MPIR_CVAR_NEIGHBOR_ALLTOALLW_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_NEIGHBOR_ALLTOALLW_DEVICE_COLLECTIVE MPICH_NEIGHBOR_ALLTOALLW_DEVICE_COLLECTIVE Description: If set to true, MPI_neighbor_alltoallw will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level neighbor_alltoallw function will not be called. Default: 1 MPIR_CVAR_REDUCE_SHORT_MSG_SIZE Aliases: MPIR_PARAM_REDUCE_SHORT_MSG_SIZE MPICH_REDUCE_SHORT_MSG_SIZE Description: the short message algorithm will be used if the send buffer size is <= this value (in bytes) Default: 2048 MPIR_CVAR_ENABLE_SMP_REDUCE Aliases: MPIR_PARAM_ENABLE_SMP_REDUCE MPICH_ENABLE_SMP_REDUCE Description: Enable SMP aware reduce. Default: 1 MPIR_CVAR_MAX_SMP_REDUCE_MSG_SIZE Aliases: MPIR_PARAM_MAX_SMP_REDUCE_MSG_SIZE MPICH_MAX_SMP_REDUCE_MSG_SIZE Description: Maximum message size for which SMP-aware reduce is used. A value of '0' uses SMP-aware reduce for all message sizes. Default: 0 MPIR_CVAR_REDUCE_INTRA_ALGORITHM Aliases: MPIR_PARAM_REDUCE_INTRA_ALGORITHM MPICH_REDUCE_INTRA_ALGORITHM Description: Variable to select reduce algorithm auto - Internal algorithm selection binomial - Force binomial algorithm nb - Force nonblocking algorithm reduce_scatter_gather - Force reduce scatter gather algorithm Default: "auto" MPIR_CVAR_REDUCE_INTER_ALGORITHM Aliases: MPIR_PARAM_REDUCE_INTER_ALGORITHM MPICH_REDUCE_INTER_ALGORITHM Description: Variable to select reduce algorithm auto - Internal algorithm selection local_reduce_remote_send - Force local-reduce-remote-send algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_REDUCE_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_REDUCE_DEVICE_COLLECTIVE MPICH_REDUCE_DEVICE_COLLECTIVE Description: If set to true, MPI_Reduce will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level reduce function will not be called. Default: 1 MPIR_CVAR_REDUCE_SCATTER_COMMUTATIVE_LONG_MSG_SIZE Aliases: MPIR_PARAM_REDUCE_SCATTER_COMMUTATIVE_LONG_MSG_SIZE MPICH_REDUCE_SCATTER_COMMUTATIVE_LONG_MSG_SIZE Description: the long message algorithm will be used if the operation is commutative and the send buffer size is >= this value (in bytes) Default: 524288 MPIR_CVAR_REDUCE_SCATTER_INTRA_ALGORITHM Aliases: MPIR_PARAM_REDUCE_SCATTER_INTRA_ALGORITHM MPICH_REDUCE_SCATTER_INTRA_ALGORITHM Description: Variable to select reduce_scatter algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm noncommutative - Force noncommutative algorithm pairwise - Force pairwise algorithm recursive_doubling - Force recursive doubling algorithm recursive_halving - Force recursive halving algorithm Default: "auto" MPIR_CVAR_REDUCE_SCATTER_INTER_ALGORITHM Aliases: MPIR_PARAM_REDUCE_SCATTER_INTER_ALGORITHM MPICH_REDUCE_SCATTER_INTER_ALGORITHM Description: Variable to select reduce_scatter algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm remote_reduce_local_scatter - Force remote-reduce-local-scatter algorithm Default: "auto" MPIR_CVAR_REDUCE_SCATTER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_REDUCE_SCATTER_DEVICE_COLLECTIVE MPICH_REDUCE_SCATTER_DEVICE_COLLECTIVE Description: If set to true, MPI_Redscat will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level reduce_scatter function will not be called. Default: 1 MPIR_CVAR_REDUCE_SCATTER_BLOCK_INTRA_ALGORITHM Aliases: MPIR_PARAM_REDUCE_SCATTER_BLOCK_INTRA_ALGORITHM MPICH_REDUCE_SCATTER_BLOCK_INTRA_ALGORITHM Description: Variable to select reduce_scatter_block algorithm auto - Internal algorithm selection noncommutative - Force noncommutative algorithm recursive_doubling - Force recursive doubling algorithm pairwise - Force pairwise algorithm recursive_halving - Force recursive halving algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_REDUCE_SCATTER_BLOCK_INTER_ALGORITHM Aliases: MPIR_PARAM_REDUCE_SCATTER_BLOCK_INTER_ALGORITHM MPICH_REDUCE_SCATTER_BLOCK_INTER_ALGORITHM Description: Variable to select reduce_scatter_block algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm remote_reduce_local_scatter - Force remote-reduce-local-scatter algorithm Default: "auto" MPIR_CVAR_REDUCE_SCATTER_BLOCK_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_REDUCE_SCATTER_BLOCK_DEVICE_COLLECTIVE MPICH_REDUCE_SCATTER_BLOCK_DEVICE_COLLECTIVE Description: If set to true, MPI_Reduce_scatter_block will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level reduce_scatter_block function will not be called. Default: 1 MPIR_CVAR_SCAN_INTRA_ALGORITHM Aliases: MPIR_PARAM_SCAN_INTRA_ALGORITHM MPICH_SCAN_INTRA_ALGORITHM Description: Variable to select allgather algorithm auto - Internal algorithm selection nb - Force nonblocking algorithm recursive_doubling - Force recursive doubling algorithm Default: "auto" MPIR_CVAR_SCAN_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_SCAN_DEVICE_COLLECTIVE MPICH_SCAN_DEVICE_COLLECTIVE Description: If set to true, MPI_Scan will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level scan function will not be called. Default: 1 MPIR_CVAR_SCATTER_INTER_SHORT_MSG_SIZE Aliases: MPIR_PARAM_SCATTER_INTER_SHORT_MSG_SIZE MPICH_SCATTER_INTER_SHORT_MSG_SIZE Description: use the short message algorithm for intercommunicator MPI_Scatter if the send buffer size is < this value (in bytes) Default: 2048 MPIR_CVAR_SCATTER_INTRA_ALGORITHM Aliases: MPIR_PARAM_SCATTER_INTRA_ALGORITHM MPICH_SCATTER_INTRA_ALGORITHM Description: Variable to select scatter algorithm auto - Internal algorithm selection binomial - Force binomial algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_SCATTER_INTER_ALGORITHM Aliases: MPIR_PARAM_SCATTER_INTER_ALGORITHM MPICH_SCATTER_INTER_ALGORITHM Description: Variable to select scatter algorithm auto - Internal algorithm selection linear - Force linear algorithm nb - Force nonblocking algorithm remote_send_local_scatter - Force remote-send-local-scatter algorithm Default: "auto" MPIR_CVAR_SCATTER_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_SCATTER_DEVICE_COLLECTIVE MPICH_SCATTER_DEVICE_COLLECTIVE Description: If set to true, MPI_Scatter will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level scatter function will not be called. Default: 1 MPIR_CVAR_SCATTERV_INTRA_ALGORITHM Aliases: MPIR_PARAM_SCATTERV_INTRA_ALGORITHM MPICH_SCATTERV_INTRA_ALGORITHM Description: Variable to select scatterv algorithm auto - Internal algorithm selection linear - Force linear algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_SCATTERV_INTER_ALGORITHM Aliases: MPIR_PARAM_SCATTERV_INTER_ALGORITHM MPICH_SCATTERV_INTER_ALGORITHM Description: Variable to select scatterv algorithm auto - Internal algorithm selection linear - Force linear algorithm nb - Force nonblocking algorithm Default: "auto" MPIR_CVAR_SCATTERV_DEVICE_COLLECTIVE Aliases: MPIR_PARAM_SCATTERV_DEVICE_COLLECTIVE MPICH_SCATTERV_DEVICE_COLLECTIVE Description: If set to true, MPI_scatterv will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level scatterv function will not be called. Default: 1 MPIR_CVAR_DEVICE_COLLECTIVES Aliases: MPIR_PARAM_DEVICE_COLLECTIVES MPICH_DEVICE_COLLECTIVES Description: If set to true, MPI collectives will allow the device to override the MPIR-level collective algorithms. The device still has the option to call the MPIR-level algorithms manually. If set to false, the device-level collective function will not be called. Default: 1 MPIR_CVAR_PROGRESS_MAX_COLLS Aliases: MPIR_PARAM_PROGRESS_MAX_COLLS MPICH_PROGRESS_MAX_COLLS Description: Maximum number of collective operations at a time that the progress engine should make progress on Default: 8 MPIR_CVAR_COMM_SPLIT_USE_QSORT Aliases: MPIR_PARAM_COMM_SPLIT_USE_QSORT MPICH_COMM_SPLIT_USE_QSORT Description: Use qsort(3) in the implementation of MPI_Comm_split instead of bubble sort. Default: 1 MPIR_CVAR_CTXID_EAGER_SIZE Aliases: MPIR_PARAM_CTXID_EAGER_SIZE MPICH_CTXID_EAGER_SIZE Description: The MPIR_CVAR_CTXID_EAGER_SIZE environment variable allows you to specify how many words in the context ID mask will be set aside for the eager allocation protocol. If the application is running out of context IDs, reducing this value may help. Default: 2 MPIR_CVAR_PROCTABLE_SIZE Aliases: MPIR_PARAM_PROCTABLE_SIZE MPICH_PROCTABLE_SIZE Description: Size of the "MPIR" debugger interface proctable (process table). Default: 64 MPIR_CVAR_PROCTABLE_PRINT Aliases: MPIR_PARAM_PROCTABLE_PRINT MPICH_PROCTABLE_PRINT Description: If true, dump the proctable entries at MPII_Wait_for_debugger-time. Default: 0 MPIR_CVAR_PRINT_ERROR_STACK Aliases: MPIR_PARAM_PRINT_ERROR_STACK MPICH_PRINT_ERROR_STACK Description: If true, print an error stack trace at error handling time. Default: 1 MPIR_CVAR_CHOP_ERROR_STACK Aliases: MPIR_PARAM_CHOP_ERROR_STACK MPICH_CHOP_ERROR_STACK Description: If >0, truncate error stack output lines this many characters wide. If 0, do not truncate, and if <0 use a sensible default. Default: 0 MPIR_CVAR_SUPPRESS_ABORT_MESSAGE Aliases: MPIR_PARAM_SUPPRESS_ABORT_MESSAGE MPICH_SUPPRESS_ABORT_MESSAGE Description: Disable printing of abort error message. Default: 0 MPIR_CVAR_MEMDUMP Aliases: MPIR_PARAM_MEMDUMP MPICH_MEMDUMP Description: If true, list any memory that was allocated by MPICH and that remains allocated when MPI_Finalize completes. Default: 1 MPIR_CVAR_MEM_CATEGORY_INFORMATION Aliases: MPIR_PARAM_MEM_CATEGORY_INFORMATION MPICH_MEM_CATEGORY_INFORMATION Description: If true, print a summary of memory allocation by category. The category definitions are found in mpl_trmem.h. Default: 0 MPIR_CVAR_ASYNC_PROGRESS Aliases: MPIR_PARAM_ASYNC_PROGRESS MPICH_ASYNC_PROGRESS Description: If set to true, MPICH will initiate an additional thread to make asynchronous progress on all communication operations including point-to-point, collective, one-sided operations and I/O. Setting this variable will automatically increase the thread-safety level to MPI_THREAD_MULTIPLE. While this improves the progress semantics, it might cause a small amount of performance overhead for regular MPI operations. The user is encouraged to leave one or more hardware threads vacant in order to prevent contention between the application threads and the progress thread(s). The impact of oversubscription is highly system dependent but may be substantial in some cases, hence this recommendation. Default: 0 MPIR_CVAR_DEFAULT_THREAD_LEVEL Aliases: MPIR_PARAM_DEFAULT_THREAD_LEVEL MPICH_DEFAULT_THREAD_LEVEL Description: Sets the default thread level to use when using MPI_INIT. This variable is case-insensitive. Default: "MPI_THREAD_SINGLE" MPIR_CVAR_DEBUG_HOLD Aliases: MPIR_PARAM_DEBUG_HOLD MPICH_DEBUG_HOLD Description: If true, causes processes to wait in MPI_Init and MPI_Initthread for a debugger to be attached. Once the debugger has attached, the variable 'hold' should be set to 0 in order to allow the process to continue (e.g., in gdb, "set hold=0"). Default: 0 MPIR_CVAR_ERROR_CHECKING Aliases: MPIR_PARAM_ERROR_CHECKING MPICH_ERROR_CHECKING Description: If true, perform checks for errors, typically to verify valid inputs to MPI routines. Only effective when MPICH is configured with --enable-error-checking=runtime . Default: 1 MPIR_CVAR_NETLOC_NODE_FILE Aliases: MPIR_PARAM_NETLOC_NODE_FILE MPICH_NETLOC_NODE_FILE Description: Subnet json file Default: "auto" MPIR_CVAR_DIMS_VERBOSE Aliases: MPIR_PARAM_DIMS_VERBOSE MPICH_DIMS_VERBOSE Description: If true, enable verbose output about the actions of the implementation of MPI_Dims_create. Default: 0 MPIR_CVAR_NAMESERV_FILE_PUBDIR Aliases: MPIR_PARAM_NAMESERV_FILE_PUBDIR MPICH_NAMESERV_FILE_PUBDIR MPIR_CVAR_NAMEPUB_DIR MPIR_PARAM_NAMEPUB_DIR MPICH_NAMEPUB_DIR Description: Sets the directory to use for MPI service publishing in the file nameserv implementation. Allows the user to override where the publish and lookup information is placed for connect/accept based applications. Default: NULL MPIR_CVAR_ABORT_ON_LEAKED_HANDLES Aliases: MPIR_PARAM_ABORT_ON_LEAKED_HANDLES MPICH_ABORT_ON_LEAKED_HANDLES Description: If true, MPI will call MPI_Abort at MPI_Finalize if any MPI object handles have been leaked. For example, if MPI_Comm_dup is called without calling a corresponding MPI_Comm_free. For uninteresting reasons, enabling this option may prevent all known object leaks from being reported. MPICH must have been configure with "--enable-g=handlealloc" or better in order for this functionality to work. Default: 0 MPIR_CVAR_NOLOCAL Aliases: MPIR_PARAM_NOLOCAL MPICH_NOLOCAL MPIR_CVAR_NO_LOCAL MPIR_PARAM_NO_LOCAL MPICH_NO_LOCAL Description: If true, force all processes to operate as though all processes are located on another node. For example, this disables shared memory communication hierarchical collectives. Default: 0 MPIR_CVAR_ODD_EVEN_CLIQUES Aliases: MPIR_PARAM_ODD_EVEN_CLIQUES MPICH_ODD_EVEN_CLIQUES MPIR_CVAR_EVEN_ODD_CLIQUES MPIR_PARAM_EVEN_ODD_CLIQUES MPICH_EVEN_ODD_CLIQUES Description: If true, odd procs on a node are seen as local to each other, and even procs on a node are seen as local to each other. Used for debugging on a single machine. Deprecated in favor of MPIR_CVAR_NUM_CLIQUES. Default: 0 MPIR_CVAR_NUM_CLIQUES Aliases: MPIR_PARAM_NUM_CLIQUES MPICH_NUM_CLIQUES MPIR_CVAR_NUM_CLIQUES MPIR_PARAM_NUM_CLIQUES MPICH_NUM_CLIQUES Description: Specify the number of cliques that should be used to partition procs on a local node. Procs with the same clique number are seen as local to each other. Used for debugging on a single machine. Default: 1 MPIR_CVAR_COLL_ALIAS_CHECK Aliases: MPIR_PARAM_COLL_ALIAS_CHECK MPICH_COLL_ALIAS_CHECK Description: Enable checking of aliasing in collective operations Default: 1 MPIR_CVAR_REQUEST_POLL_FREQ Aliases: MPIR_PARAM_REQUEST_POLL_FREQ MPICH_REQUEST_POLL_FREQ Description: How frequent to poll during completion calls (wait/test) in terms of number of processed requests before polling. Default: 8 MPIR_CVAR_REQUEST_BATCH_SIZE Aliases: MPIR_PARAM_REQUEST_BATCH_SIZE MPICH_REQUEST_BATCH_SIZE Description: The number of requests to make completion as a batch in MPI_Waitall and MPI_Testall implementation. A large number is likely to cause more cache misses. Default: 64 MPIR_CVAR_POLLS_BEFORE_YIELD Aliases: MPIR_PARAM_POLLS_BEFORE_YIELD MPICH_POLLS_BEFORE_YIELD Description: When MPICH is in a busy waiting loop, it will periodically call a function to yield the processor. This cvar sets the number of loops before the yield function is called. A value of 0 disables yielding. Default: 1000 MPIR_CVAR_NEMESIS_MXM_BULK_CONNECT Aliases: MPIR_PARAM_NEMESIS_MXM_BULK_CONNECT MPICH_NEMESIS_MXM_BULK_CONNECT Description: If true, force mxm to connect all processes at initialization time. Default: 0 MPIR_CVAR_NEMESIS_MXM_BULK_DISCONNECT Aliases: MPIR_PARAM_NEMESIS_MXM_BULK_DISCONNECT MPICH_NEMESIS_MXM_BULK_DISCONNECT Description: If true, force mxm to disconnect all processes at finalization time. Default: 0 MPIR_CVAR_NEMESIS_MXM_HUGEPAGE Aliases: MPIR_PARAM_NEMESIS_MXM_HUGEPAGE MPICH_NEMESIS_MXM_HUGEPAGE Description: If true, mxm tries detecting hugepage support. On HPC-X 2.3 and earlier, this might cause problems on Ubuntu and other platforms even if the system provides hugepage support. Default: 0 MPIR_CVAR_OFI_USE_PROVIDER Aliases: MPIR_PARAM_OFI_USE_PROVIDER MPICH_OFI_USE_PROVIDER Description: If non-null, choose an OFI provider by name. If using with the CH4 device and using a provider that supports an older version of the libfabric API then the default version of the installed library, specifying the OFI version via the appropriate CVARs is also recommended. Default: NULL MPIR_CVAR_OFI_DUMP_PROVIDERS Aliases: MPIR_PARAM_OFI_DUMP_PROVIDERS MPICH_OFI_DUMP_PROVIDERS Description: If true, dump provider information at init Default: 0 MPIR_CVAR_CH3_INTERFACE_HOSTNAME Aliases: MPIR_PARAM_CH3_INTERFACE_HOSTNAME MPICH_CH3_INTERFACE_HOSTNAME MPIR_CVAR_INTERFACE_HOSTNAME MPIR_PARAM_INTERFACE_HOSTNAME MPICH_INTERFACE_HOSTNAME Description: If non-NULL, this cvar specifies the IP address that other processes should use when connecting to this process. This cvar is mutually exclusive with the MPIR_CVAR_CH3_NETWORK_IFACE cvar and it is an error to set them both. Default: NULL MPIR_CVAR_CH3_PORT_RANGE Aliases: MPIR_PARAM_CH3_PORT_RANGE MPICH_CH3_PORT_RANGE MPIR_CVAR_PORTRANGE MPIR_CVAR_PORT_RANGE MPIR_PARAM_PORTRANGE MPIR_PARAM_PORT_RANGE MPICH_PORTRANGE MPICH_PORT_RANGE Description: The MPIR_CVAR_CH3_PORT_RANGE environment variable allows you to specify the range of TCP ports to be used by the process manager and the MPICH library. The format of this variable is <low>:<high>. To specify any available port, use 0:0. Default: {0,0} MPIR_CVAR_NEMESIS_TCP_NETWORK_IFACE Aliases: MPIR_PARAM_NEMESIS_TCP_NETWORK_IFACE MPICH_NEMESIS_TCP_NETWORK_IFACE MPIR_CVAR_NETWORK_IFACE MPIR_PARAM_NETWORK_IFACE MPICH_NETWORK_IFACE Description: If non-NULL, this cvar specifies which pseudo-ethernet interface the tcp netmod should use (e.g., "eth1", "ib0"). Note, this is a Linux-specific cvar. This cvar is mutually exclusive with the MPIR_CVAR_CH3_INTERFACE_HOSTNAME cvar and it is an error to set them both. Default: NULL MPIR_CVAR_NEMESIS_TCP_HOST_LOOKUP_RETRIES Aliases: MPIR_PARAM_NEMESIS_TCP_HOST_LOOKUP_RETRIES MPICH_NEMESIS_TCP_HOST_LOOKUP_RETRIES Description: This cvar controls the number of times to retry the gethostbyname() function before giving up. Default: 10 MPIR_CVAR_NEMESIS_ENABLE_CKPOINT Aliases: MPIR_PARAM_NEMESIS_ENABLE_CKPOINT MPICH_NEMESIS_ENABLE_CKPOINT Description: If true, enables checkpointing support and returns an error if checkpointing library cannot be initialized. Default: 0 MPIR_CVAR_NEMESIS_SHM_EAGER_MAX_SZ Aliases: MPIR_PARAM_NEMESIS_SHM_EAGER_MAX_SZ MPICH_NEMESIS_SHM_EAGER_MAX_SZ Description: This cvar controls the message size at which Nemesis switches from eager to rendezvous mode for shared memory. If this cvar is set to -1, then Nemesis will choose an appropriate value. Default: -1 MPIR_CVAR_NEMESIS_SHM_READY_EAGER_MAX_SZ Aliases: MPIR_PARAM_NEMESIS_SHM_READY_EAGER_MAX_SZ MPICH_NEMESIS_SHM_READY_EAGER_MAX_SZ Description: This cvar controls the message size at which Nemesis switches from eager to rendezvous mode for ready-send messages. If this cvar is set to -1, then ready messages will always be sent eagerly. If this cvar is set to -2, then Nemesis will choose an appropriate value. Default: -2 MPIR_CVAR_ENABLE_FT Aliases: MPIR_PARAM_ENABLE_FT MPICH_ENABLE_FT Description: Enable fault tolerance functions Default: 0 MPIR_CVAR_NEMESIS_LMT_DMA_THRESHOLD Aliases: MPIR_PARAM_NEMESIS_LMT_DMA_THRESHOLD MPICH_NEMESIS_LMT_DMA_THRESHOLD Description: Messages larger than this size will use the "dma" (knem) intranode LMT implementation, if it is enabled and available. Default: 2097152 MPIR_CVAR_NEMESIS_NETMOD Aliases: MPIR_PARAM_NEMESIS_NETMOD MPICH_NEMESIS_NETMOD Description: If non-empty, this cvar specifies which network module should be used for communication. This variable is case-insensitive. Default: "" MPIR_CVAR_CH3_ENABLE_HCOLL Aliases: MPIR_PARAM_CH3_ENABLE_HCOLL MPICH_CH3_ENABLE_HCOLL Description: If true, enable HCOLL collectives. Default: 0 MPIR_CVAR_CH3_COMM_CONNECT_TIMEOUT Aliases: MPIR_PARAM_CH3_COMM_CONNECT_TIMEOUT MPICH_CH3_COMM_CONNECT_TIMEOUT Description: The default time out period in seconds for a connection attempt to the server communicator where the named port exists but no pending accept. User can change the value for a specified connection through its info argument. Default: 180 MPIR_CVAR_CH3_RMA_OP_PIGGYBACK_LOCK_DATA_SIZE Aliases: MPIR_PARAM_CH3_RMA_OP_PIGGYBACK_LOCK_DATA_SIZE MPICH_CH3_RMA_OP_PIGGYBACK_LOCK_DATA_SIZE Description: Specify the threshold of data size of a RMA operation which can be piggybacked with a LOCK message. It is always a positive value and should not be smaller than MPIDI_RMA_IMMED_BYTES. If user sets it as a small value, for middle and large data size, we will lose performance because of always waiting for round-trip of LOCK synchronization; if user sets it as a large value, we need to consume more memory on target side to buffer this lock request when lock is not satisfied. Default: 65536 MPIR_CVAR_CH3_RMA_ACTIVE_REQ_THRESHOLD Aliases: MPIR_PARAM_CH3_RMA_ACTIVE_REQ_THRESHOLD MPICH_CH3_RMA_ACTIVE_REQ_THRESHOLD Description: Threshold of number of active requests to trigger blocking waiting in operation routines. When the value is negative, we never blockingly wait in operation routines. When the value is zero, we always trigger blocking waiting in operation routines to wait until no. of active requests becomes zero. When the value is positive, we do blocking waiting in operation routines to wait until no. of active requests being reduced to this value. Default: 65536 MPIR_CVAR_CH3_RMA_POKE_PROGRESS_REQ_THRESHOLD Aliases: MPIR_PARAM_CH3_RMA_POKE_PROGRESS_REQ_THRESHOLD MPICH_CH3_RMA_POKE_PROGRESS_REQ_THRESHOLD Description: Threshold at which the RMA implementation attempts to complete requests while completing RMA operations and while using the lazy synchonization approach. Change this value if programs fail because they run out of requests or other internal resources Default: 128 MPIR_CVAR_CH3_RMA_SCALABLE_FENCE_PROCESS_NUM Aliases: MPIR_PARAM_CH3_RMA_SCALABLE_FENCE_PROCESS_NUM MPICH_CH3_RMA_SCALABLE_FENCE_PROCESS_NUM Description: Specify the threshold of switching the algorithm used in FENCE from the basic algorithm to the scalable algorithm. The value can be nagative, zero or positive. When the number of processes is larger than or equal to this value, FENCE will use a scalable algorithm which do not use O(P) data structure; when the number of processes is smaller than the value, FENCE will use a basic but fast algorithm which requires an O(P) data structure. Default: 1024 MPIR_CVAR_CH3_RMA_DELAY_ISSUING_FOR_PIGGYBACKING Aliases: MPIR_PARAM_CH3_RMA_DELAY_ISSUING_FOR_PIGGYBACKING MPICH_CH3_RMA_DELAY_ISSUING_FOR_PIGGYBACKING Description: Specify if delay issuing of RMA operations for piggybacking LOCK/UNLOCK/FLUSH is enabled. It can be either 0 or 1. When it is set to 1, the issuing of LOCK message is delayed until origin process see the first RMA operation and piggyback LOCK with that operation, and the origin process always keeps the current last operation until the ending synchronization call in order to piggyback UNLOCK/FLUSH with that operation. When it is set to 0, in WIN_LOCK/UNLOCK case, the LOCK message is sent out as early as possible, in WIN_LOCK_ALL/UNLOCK_ALL case, the origin process still tries to piggyback LOCK message with the first operation; for UNLOCK/FLUSH message, the origin process no longer keeps the current last operation but only piggyback UNLOCK/FLUSH if there is an operation avaliable in the ending synchronization call. Default: 0 MPIR_CVAR_CH3_RMA_SLOTS_SIZE Aliases: MPIR_PARAM_CH3_RMA_SLOTS_SIZE MPICH_CH3_RMA_SLOTS_SIZE Description: Number of RMA slots during window creation. Each slot contains a linked list of target elements. The distribution of ranks among slots follows a round-robin pattern. Requires a positive value. Default: 262144 MPIR_CVAR_CH3_RMA_TARGET_LOCK_DATA_BYTES Aliases: MPIR_PARAM_CH3_RMA_TARGET_LOCK_DATA_BYTES MPICH_CH3_RMA_TARGET_LOCK_DATA_BYTES Description: Size (in bytes) of available lock data this window can provided. If current buffered lock data is more than this value, the process will drop the upcoming operation data. Requires a positive calue. Default: 655360 MPIR_CVAR_CH3_EAGER_MAX_MSG_SIZE Aliases: MPIR_PARAM_CH3_EAGER_MAX_MSG_SIZE MPICH_CH3_EAGER_MAX_MSG_SIZE Description: This cvar controls the message size at which CH3 switches from eager to rendezvous mode. Default: 131072 MPIR_CVAR_CH3_RMA_OP_WIN_POOL_SIZE Aliases: MPIR_PARAM_CH3_RMA_OP_WIN_POOL_SIZE MPICH_CH3_RMA_OP_WIN_POOL_SIZE Description: Size of the window-private RMA operations pool (in number of operations) that stores information about RMA operations that could not be issued immediately. Requires a positive value. Default: 256 MPIR_CVAR_CH3_RMA_OP_GLOBAL_POOL_SIZE Aliases: MPIR_PARAM_CH3_RMA_OP_GLOBAL_POOL_SIZE MPICH_CH3_RMA_OP_GLOBAL_POOL_SIZE Description: Size of the Global RMA operations pool (in number of operations) that stores information about RMA operations that could not be issued immediatly. Requires a positive value. Default: 16384 MPIR_CVAR_CH3_RMA_TARGET_WIN_POOL_SIZE Aliases: MPIR_PARAM_CH3_RMA_TARGET_WIN_POOL_SIZE MPICH_CH3_RMA_TARGET_WIN_POOL_SIZE Description: Size of the window-private RMA target pool (in number of targets) that stores information about RMA targets that could not be issued immediately. Requires a positive value. Default: 256 MPIR_CVAR_CH3_RMA_TARGET_GLOBAL_POOL_SIZE Aliases: MPIR_PARAM_CH3_RMA_TARGET_GLOBAL_POOL_SIZE MPICH_CH3_RMA_TARGET_GLOBAL_POOL_SIZE Description: Size of the Global RMA targets pool (in number of targets) that stores information about RMA targets that could not be issued immediatly. Requires a positive value. Default: 16384 MPIR_CVAR_CH3_RMA_TARGET_LOCK_ENTRY_WIN_POOL_SIZE Aliases: MPIR_PARAM_CH3_RMA_TARGET_LOCK_ENTRY_WIN_POOL_SIZE MPICH_CH3_RMA_TARGET_LOCK_ENTRY_WIN_POOL_SIZE Description: Size of the window-private RMA lock entries pool (in number of lock entries) that stores information about RMA lock requests that could not be satisfied immediatly. Requires a positive value. Default: 256 MPIR_CVAR_CH4_OFI_CAPABILITY_SETS_DEBUG Aliases: MPIR_PARAM_CH4_OFI_CAPABILITY_SETS_DEBUG MPICH_CH4_OFI_CAPABILITY_SETS_DEBUG Description: Prints out the configuration of each capability selected via the capability sets interface. Default: 0 MPIR_CVAR_CH4_OFI_ENABLE_DATA Aliases: MPIR_PARAM_CH4_OFI_ENABLE_DATA MPICH_CH4_OFI_ENABLE_DATA Description: Enable immediate data fields in OFI to transmit source rank outside of the match bits Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_AV_TABLE Aliases: MPIR_PARAM_CH4_OFI_ENABLE_AV_TABLE MPICH_CH4_OFI_ENABLE_AV_TABLE Description: If true, the OFI addressing information will be stored with an FI_AV_TABLE. If false, an FI_AV_MAP will be used. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_SCALABLE_ENDPOINTS Aliases: MPIR_PARAM_CH4_OFI_ENABLE_SCALABLE_ENDPOINTS MPICH_CH4_OFI_ENABLE_SCALABLE_ENDPOINTS Description: If true, use OFI scalable endpoints. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_SHARED_CONTEXTS Aliases: MPIR_PARAM_CH4_OFI_ENABLE_SHARED_CONTEXTS MPICH_CH4_OFI_ENABLE_SHARED_CONTEXTS Description: If set to false (zero), MPICH does not use OFI shared contexts. If set to -1, it is determined by the OFI capability sets based on the provider. Otherwise, MPICH tries to use OFI shared contexts. If they are unavailable, it'll fall back to the mode without shared contexts. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_MR_SCALABLE Aliases: MPIR_PARAM_CH4_OFI_ENABLE_MR_SCALABLE MPICH_CH4_OFI_ENABLE_MR_SCALABLE Description: If true, MR_SCALABLE for OFI memory regions. If false, MR_BASIC for OFI memory regions. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_TAGGED Aliases: MPIR_PARAM_CH4_OFI_ENABLE_TAGGED MPICH_CH4_OFI_ENABLE_TAGGED Description: If true, use tagged message transmission functions in OFI. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_AM Aliases: MPIR_PARAM_CH4_OFI_ENABLE_AM MPICH_CH4_OFI_ENABLE_AM Description: If true, enable OFI active message support. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_RMA Aliases: MPIR_PARAM_CH4_OFI_ENABLE_RMA MPICH_CH4_OFI_ENABLE_RMA Description: If true, enable OFI RMA support. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_ATOMICS Aliases: MPIR_PARAM_CH4_OFI_ENABLE_ATOMICS MPICH_CH4_OFI_ENABLE_ATOMICS Description: If true, enable OFI Atomics support. Default: -1 MPIR_CVAR_CH4_OFI_FETCH_ATOMIC_IOVECS Aliases: MPIR_PARAM_CH4_OFI_FETCH_ATOMIC_IOVECS MPICH_CH4_OFI_FETCH_ATOMIC_IOVECS Description: Specifies the maximum number of iovecs that can be used by the OFI provider for fetch_atomic operations. The default value is -1, indicating that no value is set. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_DATA_AUTO_PROGRESS Aliases: MPIR_PARAM_CH4_OFI_ENABLE_DATA_AUTO_PROGRESS MPICH_CH4_OFI_ENABLE_DATA_AUTO_PROGRESS Description: If true, enable MPI data auto progress. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_CONTROL_AUTO_PROGRESS Aliases: MPIR_PARAM_CH4_OFI_ENABLE_CONTROL_AUTO_PROGRESS MPICH_CH4_OFI_ENABLE_CONTROL_AUTO_PROGRESS Description: If true, enable MPI control auto progress. Default: -1 MPIR_CVAR_CH4_OFI_ENABLE_PT2PT_NOPACK Aliases: MPIR_PARAM_CH4_OFI_ENABLE_PT2PT_NOPACK MPICH_CH4_OFI_ENABLE_PT2PT_NOPACK Description: If true, enable iovec for pt2pt. Default: -1 MPIR_CVAR_CH4_OFI_CONTEXT_ID_BITS Aliases: MPIR_PARAM_CH4_OFI_CONTEXT_ID_BITS MPICH_CH4_OFI_CONTEXT_ID_BITS Description: Specifies the number of bits that will be used for matching the context ID. The default value is -1, indicating that no value is set and that the default will be defined in the ofi_types.h file. Default: -1 MPIR_CVAR_CH4_OFI_RANK_BITS Aliases: MPIR_PARAM_CH4_OFI_RANK_BITS MPICH_CH4_OFI_RANK_BITS Description: Specifies the number of bits that will be used for matching the MPI rank. The default value is -1, indicating that no value is set and that the default will be defined in the ofi_types.h file. Default: -1 MPIR_CVAR_CH4_OFI_TAG_BITS Aliases: MPIR_PARAM_CH4_OFI_TAG_BITS MPICH_CH4_OFI_TAG_BITS Description: Specifies the number of bits that will be used for matching the user tag. The default value is -1, indicating that no value is set and that the default will be defined in the ofi_types.h file. Default: -1 MPIR_CVAR_CH4_OFI_MAJOR_VERSION Aliases: MPIR_PARAM_CH4_OFI_MAJOR_VERSION MPICH_CH4_OFI_MAJOR_VERSION Description: Specifies the major version of the OFI library. The default is the major version of the OFI library used with MPICH. If using this CVAR, it is recommended that the user also specifies a specific OFI provider. Default: -1 MPIR_CVAR_CH4_OFI_MINOR_VERSION Aliases: MPIR_PARAM_CH4_OFI_MINOR_VERSION MPICH_CH4_OFI_MINOR_VERSION Description: Specifies the major version of the OFI library. The default is the minor version of the OFI library used with MPICH. If using this CVAR, it is recommended that the user also specifies a specific OFI provider. Default: -1 MPIR_CVAR_CH4_OFI_MAX_VNIS Aliases: MPIR_PARAM_CH4_OFI_MAX_VNIS MPICH_CH4_OFI_MAX_VNIS Description: If set to positive, this CVAR specifies the maximum number of CH4 VNIs that OFI netmod exposes. Default: 1 MPIR_CVAR_CH4_OFI_MAX_RMA_SEP_CTX Aliases: MPIR_PARAM_CH4_OFI_MAX_RMA_SEP_CTX MPICH_CH4_OFI_MAX_RMA_SEP_CTX Description: If set to positive, this CVAR specifies the maximum number of transmit contexts RMA can utilize in a scalable endpoint. This value is effective only when scalable endpoint is available, otherwise it will be ignored. Default: 0 MPIR_CVAR_CH4_OFI_MAX_EAGAIN_RETRY Aliases: MPIR_PARAM_CH4_OFI_MAX_EAGAIN_RETRY MPICH_CH4_OFI_MAX_EAGAIN_RETRY Description: If set to positive, this CVAR specifies the maximum number of retries of an ofi operations before returning MPIX_ERR_EAGAIN. This value is effective only when the communicator has the MPI_OFI_set_eagain info hint set to true. Default: -1 MPIR_CVAR_CH4_OFI_NUM_AM_BUFFERS Aliases: MPIR_PARAM_CH4_OFI_NUM_AM_BUFFERS MPICH_CH4_OFI_NUM_AM_BUFFERS Description: Specifies the number of buffers for receiving active messages. Default: -1 MPIR_CVAR_CH4_NETMOD Aliases: MPIR_PARAM_CH4_NETMOD MPICH_CH4_NETMOD Description: If non-empty, this cvar specifies which network module to use Default: "" MPIR_CVAR_CH4_SHM Aliases: MPIR_PARAM_CH4_SHM MPICH_CH4_SHM Description: If non-empty, this cvar specifies which shm module to use Default: "" MPIR_CVAR_CH4_ROOTS_ONLY_PMI Aliases: MPIR_PARAM_CH4_ROOTS_ONLY_PMI MPICH_CH4_ROOTS_ONLY_PMI Description: Enables an optimized business card exchange over PMI for node root processes only. Default: 0 MPIR_CVAR_CH4_RUNTIME_CONF_DEBUG Aliases: MPIR_PARAM_CH4_RUNTIME_CONF_DEBUG MPICH_CH4_RUNTIME_CONF_DEBUG Description: If enabled, CH4-level runtime configurations are printed out Default: 0 MPIR_CVAR_CH4_MT_MODEL Aliases: MPIR_PARAM_CH4_MT_MODEL MPICH_CH4_MT_MODEL Description: Specifies the CH4 multi-threading model. Possible values are: direct (default) handoff trylock Default: "" MPIR_CVAR_CH4_COMM_CONNECT_TIMEOUT Aliases: MPIR_PARAM_CH4_COMM_CONNECT_TIMEOUT MPICH_CH4_COMM_CONNECT_TIMEOUT Description: The default time out period in seconds for a connection attempt to the server communicator where the named port exists but no pending accept. User can change the value for a specified connection through its info argument. Default: 180 MPIR_CVAR_CH4_RANDOM_ADDR_RETRY Aliases: MPIR_PARAM_CH4_RANDOM_ADDR_RETRY MPICH_CH4_RANDOM_ADDR_RETRY Description: The default number of retries for generating a random address. A retrying involves only local operations. Default: 100 MPIR_CVAR_CH4_SHM_SYMHEAP_RETRY Aliases: MPIR_PARAM_CH4_SHM_SYMHEAP_RETRY MPICH_CH4_SHM_SYMHEAP_RETRY Description: The default number of retries for allocating a symmetric heap in shared memory. A retrying involves collective communication over the group in the shared memory. Default: 100 MPIR_CVAR_CH4_RMA_MEM_EFFICIENT Aliases: MPIR_PARAM_CH4_RMA_MEM_EFFICIENT MPICH_CH4_RMA_MEM_EFFICIENT Description: If true, memory-saving mode is on, per-target object is released at the epoch end call. If false, performance-efficient mode is on, all allocated target objects are cached and freed at win_finalize. Default: 0 MPIR_CVAR_ENABLE_HCOLL Aliases: MPIR_PARAM_ENABLE_HCOLL MPICH_ENABLE_HCOLL Description: Enable hcoll collective support. Default: 0 MPIR_CVAR_COLL_SCHED_DUMP Aliases: MPIR_PARAM_COLL_SCHED_DUMP MPICH_COLL_SCHED_DUMP Description: Print schedule data for nonblocking collective operations. Default: 0