===============================================================================

                               Changes in 3.3.2

===============================================================================

# Add support for struct sockaddr in MPICH, Hydra, and PMI socket

  code. Works with both IPv4 and IPv6 addresses.

# Fix localhost detection on FreeBSD and macOS, avoiding long delay

  during startup.

# Fix thread-local storage detection.

# Fix several test program bugs.

# Fix several static analysis and compiler warnings.

===============================================================================

                               Changes in 3.3.1

===============================================================================

 # Fix bug in MPI_Testany/MPI_Waitany that could cause deadlock

 # Add missing functionality in Argobots library support

 # Fix configure-time detection for thread local storage support

 # Better support for reproducible builds. Thanks to Bernhard

   Wiedemann for the report and fixes

 # Fix support for XL compiler toolchain

 # Add support for -static-intel linking option

 # Fix building on systems without weak symbols

 # Fix several static analysis and compiler warnings

===============================================================================

                               Changes in 3.3

===============================================================================

 # CH4 Device: A new device layer implementation designed for low software

   overheads. CH4 has experimental support for OFI and UCX network libraries,

   and POSIX shared memory. Thanks to Intel, Mellanox, and RIKEN AICS for

   participating in the CH4 coding effort.

 # Fixed SLURM integration in Hydra for new node list format.

 # Added support for PMIx (https://pmix.github.io/pmix/) client

   library in CH4 netmods. Note that you must use a compatible PMIx

   server in this configuration.

 # Better organization of collectives in the MPI layer. The new

   scheme, which de-couples implementation from selection logic,

   enables easier integration of additional algorithms.

 # TSP collectives framework: A C++-template style framework for

   collective algorithms is added to allow single collective

   implementation to move data over generic or device-specific

   transport functions.

 # Improvements to derived datatype testing (DTPools -

   https://wiki.mpich.org/mpich/index.php/DTPools).

 # Added new "non-catastrophic" error codes to expose internal

   resource exhaustion.

 # Added info hints to MPI_Comm_split_type to support splitting

   communicators by machine topology. Both on-node (socket, core,

   etc.) and off-node (switch-level) hints are defined.

 # Improvements to MPI_THREAD_MULTIPLE in CH4 through new thread safety

   models at the Virtual Network Interface (VNI) level. This introduces two

   new models that leverage work-queues to offload operations and improve

   scalability under contention.

 # Message Driven Thread Activation (MDTA). An alternative locking

   model is defined for MPI_THREAD_MULTIPLE in CH4.

 # Added PMI usage optimizations for business card exchange in CH4

   netmods.

 # Improvements on MPI_Abort. MPI_Abort invoked on subcommunicators will

   only abort the connected processes within that communicator.

`

 # Cleanup of whitespace (ch3 excluded) using the

   maint/code-cleanup.sh script. For instructions on how to update

   PRs/branches based on MPICH before the cleanup, see

   https://github.com/pmodels/mpich/wiki/Code-Cleanup-Procedure.

 # Removed the PAMI device and poe PMI client.

 # C99 compiler support is now required to build MPICH.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.3..v3.3.1

   A list of bugs that have been fixed is available at the following

   link:

     https://github.com/pmodels/mpich/milestone/25?closed=1

===============================================================================

                               Changes in 3.2

===============================================================================

 # Added support for MPI-3.1 features including nonblocking collective I/O,

   address manipulation routines, thread-safety for MPI initialization,

   pre-init functionality, and new MPI_T routines to look up variables

   by name.

 # Fortran 2008 bindings are enabled by default and fully supported.

 # Added support for the Mellanox MXM InfiniBand interface.  (thanks

   to Mellanox for the code contribution).

 # Added support for the Mellanox HCOLL interface for collectives.

   (thanks to Mellanox for the code contribution).

 # Significant stability improvements to the MPICH/portals4

   implementation.

 # Completely revamped RMA infrastructure including several

   scalability improvements, performance improvements, and bug fixes.

 # Added experimental support for Open Fabrics Interfaces (OFI) version 1.0.0.

   https://github.com/ofiwg/libfabric (thanks to Intel for code contribution)

 # The Myrinet MX network module, which had a life cyle from 1.1 till

   3.1.2, has now been deleted.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.1.3..v3.2

   A full list of bugs that have been fixed is available at the

   following link:

     https://trac.mpich.org/projects/mpich/query?status=closed&group=resolution&milestone=mpich-3.2

===============================================================================

                               Changes in 3.1.3

===============================================================================

 # Several enhancements to Portals4 support.

 # Several enhancements to PAMI (thanks to IBM for the code contribution).

 # Several enhancements to the CH3 RMA implementation.

 # Several enhancements to ROMIO.

 # Fixed deadlock in multi-threaded MPI_Comm_idup.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.1.2..v3.1.3

   A full list of bugs that have been fixed is available at the

   following link:

     https://trac.mpich.org/projects/mpich/query?status=closed&group=resolution&milestone=mpich-3.1.3

===============================================================================

                               Changes in 3.1.2

===============================================================================

 # Significant enhancements to the BG/Q device, especially for RMA and

   shared memory functionality.

 # Several enhancements to ROMIO.

 # Upgraded to hwloc-1.9.

 # Added more Fortran 2008 (F08) tests and fixed a few F08 binding bugs.

   Now all MPICH F90 tests have been ported to F08.

 # Updated weak alias support to align with gcc-4.x

 # Minor enhancements to the CH3 RMA implementation.

 # Better implementation of MPI_Allreduce for intercommunicator.

 # Added environment variables to control memory tracing overhead.

 # Added flags to enable C99 mode with Solaris compilers.

 # Updated implementation of MPI-T CVARs of type MPI_CHAR, as interpreted

   in MPI-3.0 Errata.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.1.1..v3.1.2

   A full list of bugs that have been fixed is available at the

   following link:

     https://trac.mpich.org/projects/mpich/query?status=closed&group=resolution&milestone=mpich-3.1.2

===============================================================================

                               Changes in 3.1.1

===============================================================================

 # Blue Gene/Q implementation supports MPI-3. This release contains a

   functional and compliant Blue Gene/Q implementation of the MPI-3 standard.

   Instructions to build on Blue Gene/Q are on the mpich.org wiki:

   http://wiki.mpich.org/mpich/index.php/BGQ

 # Fortran 2008 bindings (experimental). Build with --enable-fortran=all. Must have

   a Fortran 2008 + TS 29113 capable compiler.

 # Significant rework of MPICH library management and which symbols go

   into which libraries.  Also updated MPICH library names to make

   them consistent with Intel MPI, Cray MPI and IBM PE MPI.  Backward

   compatibility links are provided for older mpich-based build

   systems.

 # The ROMIO "Blue Gene" driver has seen significant rework.  We have separated

   "file system" features from "platform" features, since GPFS shows up in more

   places than just Blue Gene

 # New ROMIO options for aggregator selection and placement on Blue Gene

 # Optional new ROMIO two-phase algorithm requiring less communication for

   certain workloads

 # The old ROMIO optimization "deferred open" either stopped working or was

   disabled on several platforms.

 # Added support for powerpcle compiler. Patched libtool in MPICH to support

   little-endian powerpc linux host.

 # Fixed the prototype of the Reduce_local C++ binding.  The previous

   prototype was completely incorrect.  Thanks to Jeff Squyres for

   reporting the issue.

 # The mpd process manager, which was deprecated and unsupported for

   the past four major release series (1.3.x till 3.1), has now been

   deleted.  RIP.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.1..v3.1.1

   A full list of bugs that have been fixed is available at the

   following link:

     https://trac.mpich.org/projects/mpich/query?status=closed&group=resolution&milestone=mpich-3.1.1

===============================================================================

                               Changes in 3.1

===============================================================================

 # Implement runtime compatibility with MPICH-derived implementations as per

   the ABI Compatibility Initiative (see www.mpich.org/abi for more

   information).

 # Integrated MPICH-PAMI code base for Blue Gene/Q and other IBM

   platforms.

 # Several improvements to the SCIF netmod.  (code contribution from

   Intel).

 # Major revamp of the MPI_T interface added in MPI-3.

 # Added environment variables to control a lot more capabilities for

   collectives.  See the README.envvar file for more information.

 # Allow non-blocking collectives and fault tolerance at the same

   time. The option MPIR_PARAM_ENABLE_COLL_FT_RET has been deprecated as

   it is no longer necessary.

 # Improvements to MPI_WIN_ALLOCATE to internally allocate shared

   memory between processes on the same node.

 # Performance improvements for MPI RMA operations on shared memory

   for MPI_WIN_ALLOCATE and MPI_WIN_ALLOCATE_SHARED.

 # Enable shared library builds by default.

 # Upgraded hwloc to 1.8.

 # Several improvements to the Hydra-SLURM integration.

 # Several improvements to the Hydra process binding code.  See the

   Hydra wiki page for more information:

   http://wiki.mpich.org/mpich/index.php/Using_the_Hydra_Process_Manager

 # MPICH now supports operations on very large datatypes (those that describe

   more than 32 bits of data).  This work also allows MPICH to fully support

   MPI-3's introduction of MPI_Count.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.0.4..v3.1

   A full list of bugs that have been fixed is available at the

   following link:

     https://trac.mpich.org/projects/mpich/query?status=closed&group=resolution&milestone=mpich-3.1

===============================================================================

                               Changes in 3.0.4

===============================================================================

 # BUILD SYSTEM: Reordered the default compiler search to prefer Intel

   and PG compilers over GNU compilers because of the performance

   difference.

   WARNING: If you do not explicitly specify the compiler you want

   through CC and friends, this might break ABI for you relative to

   the previous 3.0.x release.

 # OVERALL: Added support to manage per-communicator eager-rendezvous

   thresholds.

 # PM/PMI: Performance improvements to the Hydra process manager on

   large-scale systems by allowing for key/value caching.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.0.3..v3.0.4

===============================================================================

                               Changes in 3.0.3

===============================================================================

 # RMA: Added a new mechanism for piggybacking RMA synchronization operations,

   which improves the performance of several synchronization operations,

   including Flush.

 # RMA: Added an optimization to utilize the MPI_MODE_NOCHECK assertion in

   passive target RMA to improve performance by eliminating a lock request

   message.

 # RMA: Added a default implementation of shared memory windows to CH3.  This

   adds support for this MPI 3.0 feature to the ch3:sock device.

 # RMA: Fix a bug that resulted in an error when RMA operation request handles

   where completed outside of a synchronization epoch.

 # PM/PMI: Upgraded to hwloc-1.6.2rc1.  This version uses libpciaccess

   instead of libpci, to workaround the GPL license used by libpci.

 # PM/PMI: Added support for the Cobalt process manager.

 # BUILD SYSTEM: allow MPI_LONG_DOUBLE_SUPPORT to be disabled with a configure

   option.

 # FORTRAN: fix MPI_WEIGHTS_EMPTY in the Fortran bindings

 # MISC: fix a bug in MPI_Get_elements where it could return incorrect values

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.0.2..v3.0.3

===============================================================================

                               Changes in 3.0.2

===============================================================================

 # PM/PMI: Upgrade to hwloc-1.6.1

 # RMA: Performance enhancements for shared memory windows.

 # COMPILER INTEGRATION: minor improvements and fixes to the clang static type

   checking annotation macros.

 # MPI-IO (ROMIO): improved error checking for user errors, contributed by IBM.

 # MPI-3 TOOLS INTERFACE: new MPI_T performance variables providing information

   about nemesis communication behavior and and CH3 message matching queues.

 # TEST SUITE: "make testing" now also outputs a "summary.tap" file that can be

   interpreted with standard TAP consumer libraries and tools.  The

   "summary.xml" format remains unchanged.

 # GIT: This is the first release built from the new git repository at

   git.mpich.org.  A few build system mechanisms have changed because of this

   switch.

 # BUG FIX: resolved a compilation error related to LLONG_MAX that affected

   several users (ticket #1776).

 # BUG FIX: nonblocking collectives now properly make progress when MPICH is

   configured with the ch3:sock channel (ticket #1785).

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available at the following link:

     http://git.mpich.org/mpich.git/shortlog/v3.0.1..v3.0.2

===============================================================================

                               Changes in 3.0.1

===============================================================================

 # PM/PMI: Critical bug-fix in Hydra to work correctly in multi-node

   tests.

 # A full list of changes is available using:

     svn log -r10790:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich-3.0.1

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich-3.0.1?action=follow_copy&rev=HEAD&stop_rev=10790&mode=follow_copy

===============================================================================

                               Changes in 3.0

===============================================================================

 # MPI-3: All MPI-3 features are now implemented and the MPI_VERSION

   bumped up to 3.0.

 # OVERALL: Added support for ARM-v7 native atomics

 # MPE: MPE is now separated out of MPICH and can be downloaded/used

   as a separate package.

 # PM/PMI: Upgraded to hwloc-1.6

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r10344:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich-3.0

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich-3.0?action=follow_copy&rev=HEAD&stop_rev=10344&mode=follow_copy

===============================================================================

                               Changes in 1.5

===============================================================================

 # OVERALL: Nemesis now supports an "--enable-yield=..." configure

   option for better performance/behavior when oversubscribing

   processes to cores.  Some form of this option is enabled by default

   on Linux, Darwin, and systems that support sched_yield().

 # OVERALL: Added support for Intel Many Integrated Core (MIC)

   architecture: shared memory, TCP/IP, and SCIF based communication.

 # OVERALL: Added support for IBM BG/Q architecture.  Thanks to IBM

   for the contribution.

 # MPI-3: const support has been added to mpi.h, although it is

   disabled by default.  It can be enabled on a per-translation unit

   basis with "#define MPICH2_CONST const".

 # MPI-3: Added support for MPIX_Type_create_hindexed_block.

 # MPI-3: The new MPI-3 nonblocking collective functions are now

   available as "MPIX_" functions (e.g., "MPIX_Ibcast").

 # MPI-3: The new MPI-3 neighborhood collective routines are now available as

   "MPIX_" functions (e.g., "MPIX_Neighbor_allgather").

 # MPI-3: The new MPI-3 MPI_Comm_split_type function is now available

   as an "MPIX_" function.

 # MPI-3: The new MPI-3 tools interface is now available as "MPIX_T_"

   functions.  This is a beta implementation right now with several

   limitations, including no support for multithreading.  Several

   performance variables related to CH3's message matching are exposed

   through this interface.

 # MPI-3: The new MPI-3 matched probe functionality is supported via

   the new routines MPIX_Mprobe, MPIX_Improbe, MPIX_Mrecv, and

   MPIX_Imrecv.

 # MPI-3: The new MPI-3 nonblocking communicator duplication routine,

   MPIX_Comm_idup, is now supported.  It will only work for

   single-threaded programs at this time.

 # MPI-3: MPIX_Comm_reenable_anysource support

 # MPI-3: Native MPIX_Comm_create_group support (updated version of

   the prior MPIX_Group_comm_create routine).

 # MPI-3: MPI_Intercomm_create's internal communication no longer interferes

   with point-to-point communication, even if point-to-point operations on the

   parent communicator use the same tag or MPI_ANY_TAG.

 # MPI-3: Eliminated the possibility of interference between

   MPI_Intercomm_create and point-to-point messaging operations.

 # Build system: Completely revamped build system to rely fully on

   autotools.  Parallel builds ("make -j8" and similar) are now supported.

 # Build system: rename "./maint/updatefiles" --> "./autogen.sh" and

   "configure.in" --> "configure.ac"

 # JUMPSHOT: Improvements to Jumpshot to handle thousands of

   timelines, including performance improvements to slog2 in such

   cases.

 # JUMPSHOT: Added navigation support to locate chosen drawable's ends

   when viewport has been scrolled far from the drawable.

 # PM/PMI: Added support for memory binding policies.

 # PM/PMI: Various improvements to the process binding support in

   Hydra.  Several new pre-defined binding options are provided.

 # PM/PMI: Upgraded to hwloc-1.5

 # PM/PMI: Several improvements to PBS support to natively use the PBS

   launcher.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r8478:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.5

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.5?action=follow_copy&rev=HEAD&stop_rev=8478&mode=follow_copy

===============================================================================

                               Changes in 1.4.1

===============================================================================

 # OVERALL: Several improvements to the ARMCI API implementation

   within MPICH2.

 # Build system: Added beta support for DESTDIR while installing

   MPICH2.

 # PM/PMI: Upgrade hwloc to 1.2.1rc2.

 # PM/PMI: Initial support for the PBS launcher.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r8675:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.4.1

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.4.1?action=follow_copy&rev=HEAD&stop_rev=8675&mode=follow_copy

===============================================================================

                               Changes in 1.4

===============================================================================

 # OVERALL: Improvements to fault tolerance for collective

   operations. Thanks to Rui Wang @ ICT for reporting several of these

   issues.

 # OVERALL: Improvements to the universe size detection. Thanks to

   Yauheni Zelenko for reporting this issue.

 # OVERALL: Bug fixes for Fortran attributes on some systems. Thanks

   to Nicolai Stange for reporting this issue.

 # OVERALL: Added new ARMCI API implementation (experimental).

 # OVERALL: Added new MPIX_Group_comm_create function to allow

   non-collective creation of sub-communicators.

 # FORTRAN: Bug fixes in the MPI_DIST_GRAPH_ Fortran bindings.

 # PM/PMI: Support for a manual "none" launcher in Hydra to allow for

   higher-level tools to be built on top of Hydra. Thanks to Justin

   Wozniak for reporting this issue, for providing several patches for

   the fix, and testing it.

 # PM/PMI: Bug fixes in Hydra to handle non-uniform layouts of hosts

   better. Thanks to the MVAPICH group at OSU for reporting this issue

   and testing it.

 # PM/PMI: Bug fixes in Hydra to handle cases where only a subset of

   the available launchers or resource managers are compiled

   in. Thanks to Satish Balay @ Argonne for reporting this issue.

 # PM/PMI: Support for a different username to be provided for each

   host; this only works for launchers that support this (such as

   SSH).

 # PM/PMI: Bug fixes for using Hydra on AIX machines. Thanks to

   Kitrick Sheets @ NCSA for reporting this issue and providing the

   first draft of the patch.

 # PM/PMI: Bug fixes in memory allocation/management for environment

   variables that was showing up on older platforms. Thanks to Steven

   Sutphen for reporting the issue and providing detailed analysis to

   track down the bug.

 # PM/PMI: Added support for providing a configuration file to pick

   the default options for Hydra. Thanks to Saurabh T. for reporting

   the issues with the current implementation and working with us to

   improve this option.

 # PM/PMI: Improvements to the error code returned by Hydra.

 # PM/PMI: Bug fixes for handling "=" in environment variable values in

   hydra.

 # PM/PMI: Upgrade the hwloc version to 1.2.

 # COLLECTIVES: Performance and memory usage improvements for MPI_Bcast

   in certain cases.

 # VALGRIND: Fix incorrect Valgrind client request usage when MPICH2 is

   built for memory debugging.

 # BUILD SYSTEM: "--enable-fast" and "--disable-error-checking" are once

   again valid simultaneous options to configure.

 # TEST SUITE: Several new tests for MPI RMA operations.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r7838:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.4

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.4?action=follow_copy&rev=HEAD&stop_rev=7838&mode=follow_copy

===============================================================================

                               Changes in 1.3.2

===============================================================================

 # OVERALL: MPICH2 now recognizes the OSX mach_absolute_time as a

   native timer type.

 # OVERALL: Performance improvements to MPI_Comm_split on large

   systems.

 # OVERALL: Several improvements to error returns capabilities in the

   presence of faults.

 # PM/PMI: Several fixes and improvements to Hydra's process binding

   capability.

 # PM/PMI: Upgrade the hwloc version to 1.1.1.

 # PM/PMI: Allow users to sort node lists allocated by resource

   managers in Hydra.

 # PM/PMI: Improvements to signal handling. Now Hydra respects Ctrl-Z

   signals and passes on the signal to the application.

 # PM/PMI: Improvements to STDOUT/STDERR handling including improved

   support for rank prepending on output. Improvements to STDIN

   handling for applications being run in the background.

 # PM/PMI: Split the bootstrap servers into "launchers" and "resource

   managers", allowing the user to pick a different resource manager

   from the launcher. For example, the user can now pick the "SLURM"

   resource manager and "SSH" as the launcher.

 # PM/PMI: The MPD process manager is deprecated.

 # PM/PMI: The PLPA process binding library support is deprecated.

 # WINDOWS: Adding support for gfortran and 64-bit gcc libs.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r7457:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.3.2

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.3.2?action=follow_copy&rev=HEAD&stop_rev=7457&mode=follow_copy

===============================================================================

                               Changes in 1.3.1

===============================================================================

 # OVERALL: MPICH2 is now fully compliant with the CIFTS FTB standard

   MPI events (based on the draft standard).

 # OVERALL: Major improvements to RMA performance for long lists of

   RMA operations.

 # OVERALL: Performance improvements for Group_translate_ranks.

 # COLLECTIVES: Collective algorithm selection thresholds can now be controlled

   at runtime via environment variables.

 # ROMIO: PVFS error codes are now mapped to MPI error codes.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r7350:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.3.1

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.3.1?action=follow_copy&rev=HEAD&stop_rev=7350&mode=follow_copy

===============================================================================

                               Changes in 1.3

===============================================================================

 # OVERALL: Initial support for fine-grained threading in

   ch3:nemesis:tcp.

 # OVERALL: Support for Asynchronous Communication Progress.

 # OVERALL: The ssm and shm channels have been removed.

 # OVERALL: Checkpoint/restart support using BLCR.

 # OVERALL: Improved tolerance to process and communication failures

   when error handler is set to MPI_ERRORS_RETURN.  If a communication

   operation fails (e.g., due to a process failure) MPICH2 will return

   an error, and further communication to that process is not

   possible.  However, communication with other processes will still

   proceed normally.  Note, however, that the behavior collective

   operations on communicators containing the failed process is

   undefined, and may give incorrect results or hang some processes.

 # OVERALL: Experimental support for inter-library dependencies.

 # PM/PMI: Hydra is now the default process management framework

   replacing MPD.

 # PM/PMI: Added dynamic process support for Hydra.

 # PM/PMI: Added support for LSF, SGE and POE in Hydra.

 # PM/PMI: Added support for CPU and memory/cache topology aware

   process-core binding.

 # DEBUGGER: Improved support and bug fixes in the Totalview support.

 # Build system: Replaced F90/F90FLAGS by FC/FCFLAGS. F90/F90FLAGS are

   not longer supported in the configure.

 # Multi-compiler support: On systems where C compiler that is used to

   build mpich2 libraries supports multiple weak symbols and multiple aliases,

   the Fortran binding built in the mpich2 libraries can handle different

   Fortran compilers (than the one used to build mpich2).  Details in README.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r5762:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.3

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.3?action=follow_copy&rev=HEAD&stop_rev=5762&mode=follow_copy

===============================================================================

                               Changes in 1.2.1

===============================================================================

 # OVERALL: Improved support for fine-grained multithreading.

 # OVERALL: Improved integration with Valgrind for debugging builds of MPICH2.

 # PM/PMI: Initial support for hwloc process-core binding library in

   Hydra.

 # PM/PMI: Updates to the PMI-2 code to match the PMI-2 API and

   wire-protocol draft.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r5425:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.2.1

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.2.1?action=follow_copy&rev=HEAD&stop_rev=5425&mode=follow_copy

===============================================================================

                               Changes in 1.2

===============================================================================

 # OVERALL: Support for MPI-2.2

 # OVERALL: Several fixes to Nemesis/MX.

 # WINDOWS: Performance improvements to Nemesis/windows.

 # PM/PMI: Scalability and performance improvements to Hydra using

   PMI-1.1 process-mapping features.

 # PM/PMI: Support for process-binding for hyperthreading enabled

   systems in Hydra.

 # PM/PMI: Initial support for PBS as a resource management kernel in

   Hydra.

 # PM/PMI: PMI2 client code is now officially included in the release.

 # TEST SUITE: Support to run the MPICH2 test suite through valgrind.

 # Several other minor bug fixes, memory leak fixes, and code cleanup.

   A full list of changes is available using:

     svn log -r5025:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.2

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.2?action=follow_copy&rev=HEAD&stop_rev=5025&mode=follow_copy

===============================================================================

                               Changes in 1.1.1p1

===============================================================================

 - OVERALL: Fixed an invalid read in the dataloop code for zero count types.

 - OVERALL: Fixed several bugs in ch3:nemesis:mx (tickets #744,#760;

   also change r5126).

 - BUILD SYSTEM: Several fixes for functionality broken in 1.1.1 release,

   including MPICH2LIB_xFLAGS and extra libraries living in $LIBS instead of

   $LDFLAGS.  Also, '-lpthread' should no longer be duplicated in link lines.

 - BUILD SYSTEM: MPICH2 shared libraries are now compatible with glibc versioned

   symbols on Linux, such as those present in the MX shared libraries.

 - BUILD SYSTEM: Minor tweaks to improve compilation under the nvcc CUDA

   compiler.

 - PM/PMI: Fix mpd incompatibility with python2.3 introduced in mpich2-1.1.1.

 - PM/PMI: Several fixes to hydra, including memory leak fixes and process

   binding issues.

 - TEST SUITE: Correct invalid arguments in the coll2 and coll3 tests.

 - Several other minor bug fixes, memory leak fixes, and code cleanup.  A full

   list of changes is available using:

     svn log -r5032:HEAD https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.1.1p1

     ... or at the following link:

     https://trac.mcs.anl.gov/projects/mpich2/log/mpich2/tags/release/mpich2-1.1.1p1?action=follow_copy&rev=HEAD&stop_rev=5032&mode=follow_copy

===============================================================================

                               Changes in 1.1.1

===============================================================================

 # OVERALL: Improved support for Boost MPI.

 # PM/PMI: Significantly improved time taken by MPI_Init with Nemesis and MPD on

   large numbers of processes.