(C) 2010 by Argonne National Laboratory.
See COPYRIGHT in top-level directory.
Automatically generated
by: ./maint/extractcvars
at: Fri Nov 10 20:21:16 2017
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_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_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_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_SUPPRESS_ABORT_MESSAGE
Aliases: MPIR_PARAM_SUPPRESS_ABORT_MESSAGE
MPICH_SUPPRESS_ABORT_MESSAGE
Description: Disable printing of abort error message.
Default: 0
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_REDSCAT_COMMUTATIVE_LONG_MSG_SIZE
Aliases: MPIR_PARAM_REDSCAT_COMMUTATIVE_LONG_MSG_SIZE
MPICH_REDSCAT_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_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_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_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_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_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_ENABLE_SMP_BARRIER
Aliases: MPIR_PARAM_ENABLE_SMP_BARRIER
MPICH_ENABLE_SMP_BARRIER
Description: Enable SMP aware barrier.
Default: 1
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_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_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_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_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_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_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
MPIR_WaitForDebugger-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_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_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_CH3_ENABLE_HCOLL
Aliases: MPIR_PARAM_CH3_ENABLE_HCOLL
MPICH_CH3_ENABLE_HCOLL
Description: If true, enable HCOLL collectives.
Default: 0
MPIR_CVAR_CH3_NOLOCAL
Aliases: MPIR_PARAM_CH3_NOLOCAL
MPICH_CH3_NOLOCAL
MPIR_CVAR_CH3_NO_LOCAL
MPIR_PARAM_CH3_NO_LOCAL
MPICH_CH3_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_CH3_ODD_EVEN_CLIQUES
Aliases: MPIR_PARAM_CH3_ODD_EVEN_CLIQUES
MPICH_CH3_ODD_EVEN_CLIQUES
MPIR_CVAR_CH3_EVEN_ODD_CLIQUES
MPIR_PARAM_CH3_EVEN_ODD_CLIQUES
MPICH_CH3_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.
Default: 0
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_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_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_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_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_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_ENABLE_FT
Aliases: MPIR_PARAM_ENABLE_FT
MPICH_ENABLE_FT
Description: Enable fault tolerance functions
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_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_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_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_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_OFI_USE_PROVIDER
Aliases: MPIR_PARAM_OFI_USE_PROVIDER
MPICH_OFI_USE_PROVIDER
Description: If non-null, choose an OFI provider by name
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_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