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Subject: [Open MPI Announce] Open MPI v1.6 released
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2012-05-14 06:27:49

The Open MPI Team, representing a consortium of research, academic, and industry partners, is pleased to announce a major release of Open MPI and the beginning of a new "super stable" release series: version 1.6.

The Open MPI project maintains two simultaneous release series:

- v1.4.x (i.e., v1.even): "super stable" series, where only bug fixes are applied
- v1.5.x (i.e., v1.odd): "feature" series, where new features are developed

v1.6 is a major release; it effectively deprecates both the v1.4.x and v1.5.x series, and replaces v1.4.x as the current "super stable" series. A forthcoming v1.7 series will become the new "feature" series.

*All users* -- including production users and downstream providers -- are encouraged to upgrade to v1.6.

Note that v1.6 is ABI compatible with the entire v1.5.x series, but is not ABI compatible with the v1.4.x series. See for a description of Open MPI's release methodology.

Version 1.6 can be downloaded from the main Open MPI web site or any of its mirrors (Windows binaries will be available shortly; mirrors will also be updating soon).

Here is a list of changes in v1.6 as compared to v1.5.5:

- Fix some process affinity issues. When binding a process, Open MPI
  will now bind to all available hyperthreads in a core (or socket,
  depending on the binding options specified).
  --> Note that "mpirun --bind-to-socket ..." does not work on POWER6-
      and POWER7-based systems with some Linux kernel versions. See
      the FAQ on the Open MPI web site for more information.
- Add support for ARM5 and ARM6 (in addition to the existing ARM7
  support). Thanks to Evan Clinton for the patch.
- Minor Mellanox MXM fixes.
- Properly detect FDR10, FDR, and EDR OpenFabrics devices.
- Minor fixes to the mpirun(1) and MPI_Comm_create(3) man pages.
- Prevent segv if COMM_SPAWN_MULTIPLE fails. Thanks to Fujitsu for
  the patch.
- Disable interposed memory management in fakeroot environments. This
  fixes a problem in some build environments.
- Minor hwloc updates.
- Array versions of MPI_TEST and MPI_WAIT with a count==0 will now
  return immediately with MPI_SUCCESS. Thanks to Jeremiah Willcock
  for the suggestion.
- Update VampirTrace to v5.12.2.
- Properly handle forwarding stdin to all processes when "mpirun
  --stdin all" is used.
- Workaround XLC assembly bug.
- OS X Tiger (10.3) has not been supported for a while, so forcibly
  abort configure if we detect it.
- Fix segv in the openib BTL when running on SPARC 64 systems.
- Fix some include file ordering issues on some BSD-based platforms.
  Thanks to Paul Hargove for this (and many, many other) fixes.
- Properly handle .FALSE. return parameter value to attribute copy
  callback functions.
- Fix a bunch of minor C++ API issues; thanks to Fujitsu for the patch.
- Fixed the default hostfile MCA parameter behavior.
- Per the MPI spec, ensure not to touch the port_name parameter to
  MPI_CLOSE_PORT (it's an IN parameter).

Jeff Squyres
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