Below is the link to the first rc release for v2.1.0:
https://www.open-mpi.org/software/ompi/v2.1/
v2.1.0 includes several new features beyond the v2.0.x series, most notably
large reductions in memory consumption for launching large numbers of MPI and
OpenSHMEM processes.
Please test! Let us know of any problems that you find.
The v2.1.x series should be backwards compatible with the v2.0.x series.
Below is a first cut of the NEWS for the v2.1.0 release (note that updating the
NEWS and README are typically among the last things we do before a release).
There are several places noted with "JMS" (my initials) where further research
is needed. Also, there may still be some features bullets missing, and/or
accidentally duplicated with bullets in the v2.0.x series. These will all be
fixed before the final v2.1.0 release. Also, the README has not yet been
updated.
Major new features:
- The main focus of the Open MPI v2.1.0 release was to update to PMIx
v1.2.1, improving launch time scalability, and greatly decreasing
the memory footprint when launching large numbers of MPI / OSHMEM
processes.
- Update OpenSHMEM API conformance to v1.3.
- The usnic BTL now supports MPI_THREAD_MULTIPLE.
- General/overall performance improvements to MPI_THREAD_MULTIPLE.
- Add a summary message at the bottom of configure that tells you many
of the configuration options specified and/or discovered by Open
MPI.
JMS Any other major new features to list?
Changes in behavior compared to prior versions:
- Should be none.
^^^ JMS Did we change --host or --hostfile behavior?
Removed legacy support:
- The ptmalloc2 hooks have been removed from the Open MPI code base.
This is not really a user-noticable change; it is only mentioned
here because there was much rejoycing in the Open MPI developer
community.
Bug fixes/minor improvements:
- New MCA parameters:
- iof_base_redirect_app_stderr_to_stdout: as its name implies, it
combines MPI / OpenSHMEM applications' stderr into its stdout
stream.
- opal_event_include: allow the user to specify which FD selection
mechanism is used by the underlying event engine.
- opal_stacktrace_output: indicate where stacktraces should be sent
upon MPI / OpenSHMEM process crashes ("none", "stdout", "stderr",
"file:filename").
- orte_timeout_for_stack_trace: number of seconds to wait for stack
traces to be reported (or <=0 to wait forever).
- Various improvements to the Portals 4 MTL, to include adding support
for non-contiguous datatypes.
- Various updates for the UCX PML.
- Updates to the following man pages:
- mpirun(1)
- MPI_COMM_CONNECT(3)
- MPI_WIN_GET_NAME(3). Thanks to Nicolas Joly for reporting the
typo.
- MPI_INFO_GET_[NKEYS|NTHKEY](3). Thanks to Nicolas Joly for
reporting the typo.
- Fix external32 support
^^^ JMS probably need to explain this more
^^^ JMS is there a user to cite here?
- Add note how to disable a warning message about when a high-speed
MPI transport is not found. Thanks to Susan Schwarz for reporting
the issue.
- Ensure that sending SIGINT when using the rsh/ssh launcher does not
orphan children nodes in the launch tree.
- Fix the help message when showing deprecated MCA param names to show
the correct (i.e., deprecated) name.
- Fix a minor error in MPI_AINT_DIFF.
- Fix bugs with MPI_IN_PLACE handling in:
- MPI_ALLGATHER[V]
- MPI_IALLTOALL*
- MPI_[I][GATHER|SCATTER][V]
- MPI_IREDUCE[_SCATTER]
- Thanks to all the users who helped diagnose these issues.
^^^ JMS Are there specific users to cite here?
- Allow qrsh to tree spawn (if the back-end system supports it).
- Fix MPI_T_PVAR_GET_INDEX to return the correct index.
^^^ JMS is there a user to cite here?
- Correctly position the shared file pointer in append mode in the
OMPIO component.
^^^ JMS is there a user to cite here?
- ...something about OMPIO SHAREDFP flag set...?
^^^ JMS probably need to explain this more
- Add some deprecated names into shmem.h for backwards compatibility
with legacy codes.
- Fix MPI_MODE_NOCHECK support.
^^^ JMS is there a user to cite here?
- Fix a regression in PowerPC atomics support. Thanks to Orion
Poplawski for reporting the issue.
- Fixes for assembly code with aggressively-optimized compilers on
x86_64/AMD64 platforms.
- Fix one more place where configure was mangling custom CFLAGS.
Thanks to Phil Tooley (@Telemin) for reporting the issue.
- Better handle builds with external installations of hwloc.
- Fixed a hang with MPI_PUT and MPI_WIN_LOCK_ALL.
- Fixed a bug when using MPI_GET on non-contiguous datatypes and
MPI_LOCK/MPI_UNLOCK.
- Fixed a bug when using POST/START/COMPLETE/WAIT after a fence.
- Fix configure portability by cleaning up a few uses of "==" with
"test". Thanks to Kevin Buckley for pointing out the issue.
- Fix bug when using darrays with lib and extent of darray datatypes.
- Updates to make Open MPI binary builds more bit-for-bit
reproducable. Thanks to Alastair McKinstry for the suggestion.
- Fix issues regarding persistent request handling.
- Ensure that shmemx.h is a standalone OpenSHMEM header file. Thanks
to Nick Park (@nspark) for the report.
- Ensure that we always send SIGTERM prior to SIGKILL. Thanks to Noel
Rycroft for the report.
- Added ConnectX-5 and Chelsio T6 device defaults for the openib BTL.
- OpenSHMEM no longer supports MXM less than v2.0.
- Plug a memory leak in ompi_osc_sm_free. Thanks to Joseph Schuchart
for the report.
- The "self" BTL now uses less memory.
- The vader BTL is now more efficient in terms of memory usage when
using XPMEM.
- Removed the --enable-openib-failover configure option. This is not
considered backwards-incompatible because this option was stale and
had long-since stopped working, anyway.
- Add support for 32-bit and floating point Cray Aries atomic
operations.
- Add support for network AMOs for MPI_ACCUMULATE, MPI_FETCH_AND_OP,
and MPI_COMPARE_AND_SWAP if the "ompi_single_intrinsice" info key is
set on the window or the "acc_single_interinsic" MCA param is set.
^^^ JMS Is that the right MCA param name?
- Automatically disqualify RDMA CM support in the openib BTL if
MPI_THREAD_MULTIPLE is used.
- Make configure smarter/better about auto-detecting Linux CMA
support.
- Improve the scalability of MPI_COMM_SPLIT_TYPE.
- Fix the mixing of C99 and C++ header files with the MPI C++
bindings. Thanks to Alastair McKinstry for the bug report.
- Add support for ARM v8.
- Several MCA paramters now directly support MPI_T enumerator
semantics (i.e., they accept a limited set of values -- e.g., MCA
parameters that accept boolean values).
- Added --with-libmpi-name=STRING configure option for vendor releases
of Open MPI. See the README for more detail.
Known issues (to be addressed in v2.1.1):
- See the list of fixes slated for v2.1.1 here:
https://github.com/open-mpi/ompi/milestone/26
--
Jeff Squyres
jsquy...@cisco.com
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