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</style><div class="section" id="open-mpi-v4-1-x-series">
<h1><span class="section-number">3.1.2. </span>Open MPI v4.1.x series<a class="headerlink" href="#open-mpi-v4-1-x-series" title="Permalink to this heading"></a></h1>
<p>This file contains all the NEWS updates for the Open MPI v4.1.x
series, in reverse chronological order.</p>
<div class="section" id="open-mpi-version-4-1-6">
<h2><span class="section-number">3.1.2.1. </span>Open MPI version 4.1.6<a class="headerlink" href="#open-mpi-version-4-1-6" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>September, 2023</p>
</dd>
</dl>
<ul>
<li><p>Fix configure issue with XCode 15.</p></li>
<li><p>Update embedded PMIx to 3.2.5. PMIx 3.2.5 addresses CVE-2023-41915.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Prior versions of Open MPI (and their associated PMIx
implementations) are <strong>not</strong> impacted by this CVE, because
Open MPI never uses escalated privileges on behalf of an
unprivileged user. We are backporting this change both
because it is low risk and to avoid alarms from CVE
scanners.</p>
</div>
</li>
<li><p>Fix issue with buffered sends and MTL-based interfaces (Libfabric,
PSM, Portals).</p></li>
<li><p>Add missing <code class="docutils literal notranslate"><span class="pre">MPI_F_STATUS_SIZE</span></code> to <code class="docutils literal notranslate"><span class="pre">mpi.h</span></code>. Thanks to @jprotze for
reporting the issue.</p></li>
<li><p>Update Fortran <code class="docutils literal notranslate"><span class="pre">mpi</span></code> module configure check to be more correct.
Thanks to Sergey Kosukhin for identifying the issue and supplying
the fix.</p></li>
<li><p>Update to properly handle PMIx v>=4.2.3. Thanks to Bruno Chareyre,
Github user @sukanka, and Christof Koehler for raising the
compatibility issues and helping test the fixes.</p></li>
<li><p>Fix minor issues and add some minor performance optimizations with
OFI support.</p></li>
<li><p>Support the <code class="docutils literal notranslate"><span class="pre">striping_factor</span></code> and <code class="docutils literal notranslate"><span class="pre">striping_unit</span></code> MPI_Info names
recomended by the MPI standard for parallel IO.</p></li>
<li><p>Fixed some minor issues with UCX support.</p></li>
<li><p>Minor optimization for 0-byte MPI_Alltoallw (i.e., make it a no-op).</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-4-1-5">
<h2><span class="section-number">3.1.2.2. </span>Open MPI version 4.1.5<a class="headerlink" href="#open-mpi-version-4-1-5" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>February, 2023</p>
</dd>
</dl>
<ul>
<li><p>Fix crash in one-sided applications for certain process layouts.</p></li>
<li><p>Update embedded OpenPMIx to version 3.2.4</p></li>
<li><p>Fix issue building with <code class="docutils literal notranslate"><span class="pre">ifort</span></code> on MacOS.</p></li>
<li><p>Backport patches to Libevent for CVE-2016-10195, CVE-2016-10196, and
CVE-2016-10197.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Open MPI’s internal libevent does not use the impacted
portions of the Libevent code base.</p>
</div>
</li>
<li><p>SHMEM improvements:</p>
<ul class="simple">
<li><p>Fix initializer bugs in SHMEM interface.</p></li>
<li><p>Fix unsigned type comparisons generating warnings.</p></li>
<li><p>Fix use after clear issue in <code class="docutils literal notranslate"><span class="pre">shmem_ds_reset</span></code>.</p></li>
</ul>
</li>
<li><p>UCX improvements</p>
<ul class="simple">
<li><p>Fix memory registration bug that could occur when UCX was built
but not selected.</p></li>
<li><p>Reduce overhead of <code class="docutils literal notranslate"><span class="pre">add_procs</span></code> with intercommunicators.</p></li>
<li><p>Enable <code class="docutils literal notranslate"><span class="pre">multi_send_nb</span></code> by default.</p></li>
<li><p>Call <code class="docutils literal notranslate"><span class="pre">opal_progress</span></code> while waiting for a UCX fence to complete.</p></li>
</ul>
</li>
<li><p>Fix data corruption bug in osc/rdma component.</p></li>
<li><p>Fix overflow bug in alltoall collective</p></li>
<li><p>Fix crash when displaying topology.</p></li>
<li><p>Add some <code class="docutils literal notranslate"><span class="pre">MPI_F_XXX</span></code> constants that were missing from <code class="docutils literal notranslate"><span class="pre">mpi.h</span></code>.</p></li>
<li><p>coll/ucc bug fixes.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-4-1-4">
<h2><span class="section-number">3.1.2.3. </span>Open MPI version 4.1.4<a class="headerlink" href="#open-mpi-version-4-1-4" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>May, 2022</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fix possible length integer overflow in numerous non-blocking collective
operations.</p></li>
<li><p>Fix segmentation fault in UCX if MPI Tool interface is finalized before
<code class="docutils literal notranslate"><span class="pre">MPI_Init</span></code> is called.</p></li>
<li><p>Remove <code class="docutils literal notranslate"><span class="pre">/usr/bin/python</span></code> dependency in configure.</p></li>
<li><p>Fix OMPIO issue with long double etypes.</p></li>
<li><p>Update treematch topology component to fix numerous correctness issues.</p></li>
<li><p>Fix memory leak in UCX MCA parameter registration.</p></li>
<li><p>Fix long operation closing file descriptors on non-Linux systems that
can appear as a hang to users.</p></li>
<li><p>Fix for attribute handling on GCC 11 due to pointer aliasing.</p></li>
<li><p>Fix multithreaded race in UCX PML’s datatype handling.</p></li>
<li><p>Fix a correctness issue in CUDA Reduce algorithm.</p></li>
<li><p>Fix compilation issue with CUDA GPUDirect RDMA support.</p></li>
<li><p>Fix to make <code class="docutils literal notranslate"><span class="pre">shmem_calloc(...,</span> <span class="pre">0)</span></code> conform to the OpenSHMEM
specification.</p></li>
<li><p>Add UCC collectives component.</p></li>
<li><p>Fix divide by zero issue in OMPI IO component.</p></li>
<li><p>Fix compile issue with libnl when not in standard search locations.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-4-1-3">
<h2><span class="section-number">3.1.2.4. </span>Open MPI version 4.1.3<a class="headerlink" href="#open-mpi-version-4-1-3" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>March, 2022</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fixed a seg fault in the <code class="docutils literal notranslate"><span class="pre">smcuda</span></code> BTL. Thanks to Moritz Kreutzer
and @Stadik for reporting the issue.</p></li>
<li><p>Added support for <code class="docutils literal notranslate"><span class="pre">ELEMENTAL</span></code> to the MPI handle comparison
functions in the <code class="docutils literal notranslate"><span class="pre">mpi_f08</span></code> module. Thanks to Salvatore Filippone
for raising the issue.</p></li>
<li><p>Minor datatype performance improvements in the CUDA-based code paths.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">MPI_ALLTOALLV</span></code> when used with <code class="docutils literal notranslate"><span class="pre">MPI_IN_PLACE</span></code>.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">MPI_BOTTOM</span></code> handling for non-blocking collectives. Thanks to
Lisandro Dalcin for reporting the problem.</p></li>
<li><p>Enable OPAL memory hooks by default for UCX.</p></li>
<li><p>Many compiler warnings fixes, particularly for newer versions of
GCC.</p></li>
<li><p>Fix intercommunicator overflow with large payload collectives. Also
fixed <code class="docutils literal notranslate"><span class="pre">MPI_REDUCE_SCATTER_BLOCK</span></code> for similar issues with large
payload collectives.</p></li>
<li><p>Back-port ROMIO 3.3 fix to use stat64() instead of stat() on GPFS.</p></li>
<li><p>Fixed several non-blocking MPI collectives to not round fractions
based on float precision.</p></li>
<li><p>Fix compile failure for <code class="docutils literal notranslate"><span class="pre">--enable-heterogeneous</span></code>. Also updated
the README to clarify that <code class="docutils literal notranslate"><span class="pre">--enable-heterogeneous</span></code> is functional,
but still not recomended for most environments.</p></li>
<li><p>Minor fixes to OMPIO, including:</p>
<ul>
<li><p>Fixing the open behavior of shared memory shared file pointers.
Thanks to Axel Huebl for reporting the issue</p></li>
<li><p>Fixes to clean up lockfiles when closing files. Thanks to Eric
Chamberland for reporting the issue.</p></li>
</ul>
</li>
<li><p>Update LSF configure failure output to be more clear (e.g., on RHEL
platforms).</p></li>
<li><p>Update <code class="docutils literal notranslate"><span class="pre">if_[in|ex]clude</span></code> behavior in <code class="docutils literal notranslate"><span class="pre">btl_tcp</span></code> and <code class="docutils literal notranslate"><span class="pre">oob_tcp</span></code>
to select <em>all</em> interfaces that fall within the specified subnet
range.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-4-1-2">
<h2><span class="section-number">3.1.2.5. </span>Open MPI version 4.1.2<a class="headerlink" href="#open-mpi-version-4-1-2" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>November, 2021</p>
</dd>
</dl>
<ul>
<li><p>ROMIO portability fix for OpenBSD</p></li>
<li><p>Fix handling of <code class="docutils literal notranslate"><span class="pre">MPI_IN_PLACE</span></code> with <code class="docutils literal notranslate"><span class="pre">MPI_ALLTOALLW</span></code> and improve performance
of <code class="docutils literal notranslate"><span class="pre">MPI_ALLTOALL</span></code> and <code class="docutils literal notranslate"><span class="pre">MPI_ALLTOALLV</span></code> for <code class="docutils literal notranslate"><span class="pre">MPI_IN_PLACE.</span></code></p></li>
<li><p>Fix one-sided issue with empty groups in Post-Start-Wait-Complete
synchronization mode.</p></li>
<li><p>Fix Fortran status returns in certain use cases involving
Generalized Requests</p></li>
<li><p>Romio datatype bug fixes.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">oshmem_shmem_finalize()</span></code> when <code class="docutils literal notranslate"><span class="pre">main()</span></code> returns non-zero value.</p></li>
<li><p>Fix wrong affinity under LSF with the membind option.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">count==0</span></code> cases in <code class="docutils literal notranslate"><span class="pre">MPI_REDUCE</span></code> and <code class="docutils literal notranslate"><span class="pre">MPI_IREDUCE.</span></code></p></li>
<li><p>Fix ssh launching on Bourne-flavored shells when the user has <code class="docutils literal notranslate"><span class="pre">set</span> <span class="pre">-u</span></code>
set in their shell startup files.</p></li>
<li><p>Correctly process 0 slots with the <code class="docutils literal notranslate"><span class="pre">mpirun</span> <span class="pre">--host</span></code> option.</p></li>
<li><p>Ensure to unlink and rebind socket when the Open MPI session
directory already exists.</p></li>
<li><p>Fix a segv in <code class="docutils literal notranslate"><span class="pre">mpirun</span> <span class="pre">--disable-dissable-map</span></code>.</p></li>
<li><p>Fix a potential hang in the memory hook handling.</p></li>
<li><p>Slight performance improvement in <code class="docutils literal notranslate"><span class="pre">MPI_WAITALL</span></code> when running in
<code class="docutils literal notranslate"><span class="pre">MPI_THREAD_MULTIPLE</span></code>.</p></li>
<li><p>Fix hcoll datatype mapping and rooted operation behavior.</p></li>
<li><p>Correct some operations modifying <code class="docutils literal notranslate"><span class="pre">MPI_Status</span></code>. <code class="docutils literal notranslate"><span class="pre">MPI_ERROR</span></code> when it is
disallowed by the MPI standard.</p></li>
<li><p>UCX updates:</p>
<blockquote>
<div><ul class="simple">
<li><p>Fix datatype reference count issues.</p></li>
<li><p>Detach dynamic window memory when freeing a window.</p></li>
<li><p>Fix memory leak in datatype handling.</p></li>
</ul>
</div></blockquote>
</li>
<li><p>Fix various atomic operations issues.</p></li>
<li><p>mpirun: try to set the curses winsize to the pty of the spawned
task. Thanks to Stack Overflow user @Seriously for reporting the
issue.</p></li>
<li><p>PMIx updates:</p>
<blockquote>
<div><ul class="simple">
<li><p>Fix compatibility with external PMIx v4.x installations.</p></li>
<li><p>Fix handling of PMIx v3.x compiler/linker flags. Thanks to Erik
Schnetter for reporting the issue.</p></li>
<li><p>Skip SLURM-provided PMIx detection when appropriate. Thanks to
Alexander Grund for reporting the issue.</p></li>
</ul>
</div></blockquote>
</li>
<li><p>Fix handling by C++ compilers when they #include the STL “<version>”
header file, which ends up including Open MPI’s text VERSION file
(which is not C code). Thanks to @srpgilles for reporting the
issue.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">MPI_Op</span></code> support for <code class="docutils literal notranslate"><span class="pre">MPI_LONG</span></code>.</p></li>
<li><p>Make the MPI C++ bindings library (libmpi_cxx) explicitly depend on
the OPAL internal library (libopen-pal). Thanks to Ye Luo for
reporting the issue.</p></li>
<li><p>Fix configure handling of <code class="docutils literal notranslate"><span class="pre">--with-libevent=/usr</span></code>.</p></li>
<li><p>Fix memory leak when opening Lustre files. Thanks to Bert Wesarg
for submitting the fix.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">MPI_SENDRECV_REPLACE</span></code> to correctly process datatype errors.
Thanks to Lisandro Dalcin for reporting the issue.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">MPI_SENDRECV_REPLACE</span></code> to correctly handle large data. Thanks
Jakub Benda for reporting this issue and suggesting a fix.</p></li>
<li><p>Add workaround for TCP “dropped connection” errors to drastically
reduce the possibility of this happening.</p></li>
<li><p>OMPIO updates:</p>
<blockquote>
<div><ul class="simple">
<li><p>Fix handling when AMODE is not set. Thanks to Rainer Keller for
reporting the issue and supplying the fix.</p></li>
<li><p>Fix FBTL “posix” component linking issue. Thanks for Honggang Li
for reporting the issue.</p></li>
<li><p>Fixed segv with <code class="docutils literal notranslate"><span class="pre">MPI_FILE_GET_BYTE_OFFSET</span></code> on 0-sized file view.</p></li>
<li><p>Thanks to GitHub user @shanedsnyder for submitting the issue.</p></li>
</ul>
</div></blockquote>
</li>
<li><p>OFI updates:</p>
<blockquote>
<div><ul class="simple">
<li><p>Multi-plane / Multi-Nic nic selection cleanups</p></li>
<li><p>Add support for exporting Open MPI memory monitors into
Libfabric.</p></li>
<li><p>Ensure that Cisco usNIC devices are never selected by the OFI
MTL.</p></li>
<li><p>Fix buffer overflow in OFI networking setup. Thanks to Alexander
Grund for reporting the issue and supplying the fix.</p></li>
</ul>
</div></blockquote>
</li>
<li><p>Fix SSEND on tag matching networks.</p></li>
<li><p>Fix error handling in several MPI collectives.</p></li>
<li><p>Fix the ordering of <code class="docutils literal notranslate"><span class="pre">MPI_COMM_SPLIT_TYPE</span></code>. Thanks to Wolfgang
Bangerth for raising the issue.</p></li>
<li><p>No longer install the orted-mpir library (it’s an internal / Libtool
convenience library). Thanks to Andrew Hesford for the fix.</p></li>
<li><p>PSM2 updates:</p>
<blockquote>
<div><ul class="simple">
<li><p>Allow advanced users to disable PSM2 version checking.</p></li>
<li><p>Fix to allow non-default installation locations of psm2.h.</p></li>
</ul>
</div></blockquote>
</li>
</ul>
</div>
<div class="section" id="open-mpi-version-4-1-1">
<h2><span class="section-number">3.1.2.6. </span>Open MPI version 4.1.1<a class="headerlink" href="#open-mpi-version-4-1-1" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>April, 2021</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fix a number of datatype issues, including an issue with
improper handling of partial datatypes that could lead to
an unexpected application failure.</p></li>
<li><p>Change UCX PML to not warn about MPI_Request leaks during
<code class="docutils literal notranslate"><span class="pre">MPI_Finalize()</span></code> by default. The old behavior can be restored with
the mca_pml_ucx_request_leak_check MCA parameter.</p></li>
<li><p>Reverted temporary solution that worked around launch issues in
SLURM v20.11.{0,1,2}. SchedMD encourages users to avoid these
versions and to upgrade to v20.11.3 or newer.</p></li>
<li><p>Updated PMIx to v3.2.2.</p></li>
<li><p>Fixed configuration issue on Apple Silicon observed with
Homebrew. Thanks to François-Xavier Coudert for reporting the issue.</p></li>
<li><p>Disabled gcc built-in atomics by default on aarch64 platforms.</p></li>
<li><p>Disabled UCX PML when UCX v1.8.0 is detected. UCX version 1.8.0 has a bug that
may cause data corruption when its TCP transport is used in conjunction with
the shared memory transport. UCX versions prior to v1.8.0 are not affected by
this issue. Thanks to @ksiazekm for reporting the issue.</p></li>
<li><p>Fixed detection of available UCX transports/devices to better inform PML
prioritization.</p></li>
<li><p>Fixed SLURM support to mark ORTE daemons as non-MPI tasks.</p></li>
<li><p>Improved AVX detection to more accurately detect supported
platforms. Also improved the generated AVX code, and switched to
using word-based MCA params for the op/avx component (vs. numeric
big flags).</p></li>
<li><p>Improved OFI compatibility support and fixed memory leaks in error
handling paths.</p></li>
<li><p>Improved HAN collectives with support for Barrier and Scatter. Thanks
to @EmmanuelBRELLE for these changes and the relevant bug fixes.</p></li>
<li><p>Fixed MPI debugger support (i.e., the <code class="docutils literal notranslate"><span class="pre">MPIR_Breakpoint()</span></code> symbol).
Thanks to @louisespellacy-arm for reporting the issue.</p></li>
<li><p>Fixed ORTE bug that prevented debuggers from reading MPIR_Proctable.</p></li>
<li><p>Removed PML uniformity check from the UCX PML to address performance
regression.</p></li>
<li><p>Fixed <code class="docutils literal notranslate"><span class="pre">MPI_Init_thread(3)</span></code> statement about C++ binding and update
references about <code class="docutils literal notranslate"><span class="pre">MPI_THREAD_MULTIPLE.</span></code> Thanks to Andreas Lösel for
bringing the outdated docs to our attention.</p></li>
<li><p>Added <code class="docutils literal notranslate"><span class="pre">fence_nb</span></code> to Flux PMIx support to address segmentation faults.</p></li>
<li><p>Ensured progress of AIO requests in the POSIX FBTL component to
prevent exceeding maximum number of pending requests on MacOS.</p></li>
<li><p>Used OPAL’s mutli-thread support in the orted to leverage atomic
operations for object refcounting.</p></li>
<li><p>Fixed segv when launching with static TCP ports.</p></li>
<li><p>Fixed <code class="docutils literal notranslate"><span class="pre">--debug-daemons</span></code> mpirun CLI option.</p></li>
<li><p>Fixed bug where mpirun did not honor <code class="docutils literal notranslate"><span class="pre">--host</span></code> in a managed job
allocation.</p></li>
<li><p>Made a managed allocation filter a hostfile/hostlist.</p></li>
<li><p>Fixed bug to marked a generalized request as pending once initiated.</p></li>
<li><p>Fixed external PMIx v4.x check.</p></li>
<li><p>Fixed OSHMEM build with <code class="docutils literal notranslate"><span class="pre">--enable-mem-debug</span></code>.</p></li>
<li><p>Fixed a performance regression observed with older versions of GCC when
<code class="docutils literal notranslate"><span class="pre">__ATOMIC_SEQ_CST</span></code> is used. Thanks to @BiplabRaut for reporting the issue.</p></li>
<li><p>Fixed buffer allocation bug in the binomial tree scatter algorithm when
non-contiguous datatypes are used. Thanks to @sadcat11 for reporting the issue.</p></li>
<li><p>Fixed bugs related to the accumulate and atomics functionality in the
osc/rdma component.</p></li>
<li><p>Fixed race condition in MPI group operations observed with
<code class="docutils literal notranslate"><span class="pre">MPI_THREAD_MULTIPLE</span></code> threading level.</p></li>
<li><p>Fixed a deadlock in the TCP BTL’s connection matching logic.</p></li>
<li><p>Fixed pml/ob1 compilation error when CUDA support is enabled.</p></li>
<li><p>Fixed a build issue with Lustre caused by unnecessary header includes.</p></li>
<li><p>Fixed a build issue with IMB LSF workload manager.</p></li>
<li><p>Fixed linker error with UCX SPML.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-4-1-0">
<h2><span class="section-number">3.1.2.7. </span>Open MPI version 4.1.0<a class="headerlink" href="#open-mpi-version-4-1-0" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>December, 2020</p>
</dd>
</dl>
<ul class="simple">
<li><p>collectives: Add HAN and ADAPT adaptive collectives components.
Both components are off by default and can be enabled by specifying
<code class="docutils literal notranslate"><span class="pre">mpirun</span> <span class="pre">--mca</span> <span class="pre">coll_adapt_priority</span> <span class="pre">100</span> <span class="pre">--mca</span> <span class="pre">coll_han_priority</span> <span class="pre">100</span> <span class="pre">...</span></code>.
We intend to enable both by default in Open MPI 5.0.</p></li>
<li><p>OMPIO is now the default for MPI-IO on all filesystems, including
Lustre (prior to this, ROMIO was the default for Lustre). Many
thanks to Mark Dixon for identifying MPI I/O issues and providing
access to Lustre systems for testing.</p></li>
<li><p>Updates for macOS Big Sur. Thanks to FX Coudert for reporting this
issue and pointing to a solution.</p></li>
<li><p>Minor MPI one-sided RDMA performance improvements.</p></li>
<li><p>Fix hcoll <code class="docutils literal notranslate"><span class="pre">MPI_SCATTERV</span></code> with <code class="docutils literal notranslate"><span class="pre">MPI_IN_PLACE</span></code>.</p></li>
<li><p>Add AVX support for MPI collectives.</p></li>
<li><p>Updates to mpirun(1) about “slots” and PE=x values.</p></li>
<li><p>Fix buffer allocation for large environment variables. Thanks to
@zrss for reporting the issue.</p></li>
<li><p>Upgrade the embedded OpenPMIx to v3.2.2.</p></li>
<li><p>Take more steps towards creating fully Reproducible builds (see
<a class="reference external" href="https://reproducible-builds.org/">https://reproducible-builds.org/</a>). Thanks Bernhard M. Wiedemann for
bringing this to our attention.</p></li>
<li><p>Fix issue with extra-long values in MCA files. Thanks to GitHub
user @zrss for bringing the issue to our attention.</p></li>
<li><p>UCX: Fix zero-sized datatype transfers.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">--cpu-list</span></code> for non-uniform modes.</p></li>
<li><p>Fix issue in PMIx callback caused by missing memory barrier on Arm platforms.</p></li>
<li><p>OFI MTL: Various bug fixes.</p></li>
<li><p>Fixed issue where <code class="docutils literal notranslate"><span class="pre">MPI_TYPE_CREATE_RESIZED</span></code> would create a datatype
with unexpected extent on oddly-aligned datatypes.</p></li>
<li><p>collectives: Adjust default tuning thresholds for many collective
algorithms</p></li>
<li><p>runtime: fix situation where rank-by argument does not work</p></li>
<li><p>Portals4: Clean up error handling corner cases</p></li>
<li><p>runtime: Remove <code class="docutils literal notranslate"><span class="pre">--enable-install-libpmix</span></code> option, which has not
worked since it was added</p></li>
<li><p>opal: Disable memory patcher component on MacOS</p></li>
<li><p>UCX: Allow UCX 1.8 to be used with the btl uct</p></li>
<li><p>UCX: Replace usage of the deprecated NB API of UCX with NBX</p></li>
<li><p>OMPIO: Add support for the IME file system</p></li>
<li><p>OFI/libfabric: Added support for multiple NICs</p></li>
<li><p>OFI/libfabric: Added support for Scalable Endpoints</p></li>
<li><p>OFI/libfabric: Added btl for one-sided support</p></li>
<li><p>OFI/libfabric: Multiple small bugfixes</p></li>
<li><p>libnbc: Adding numerous performance-improving algorithms</p></li>
</ul>
</div>
</div>
</div>
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