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</style><div class="section" id="open-mpi-v3-0-x-series">
<h1><span class="section-number">3.1.5. </span>Open MPI v3.0.x series<a class="headerlink" href="#open-mpi-v3-0-x-series" title="Permalink to this heading"></a></h1>
<p>This file contains all the NEWS updates for the Open MPI v3.0.x
series, in reverse chronological order.</p>
<div class="section" id="open-mpi-version-3-0-6">
<h2><span class="section-number">3.1.5.1. </span>Open MPI version 3.0.6<a class="headerlink" href="#open-mpi-version-3-0-6" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>March, 2020</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fix one-sided shared memory window configuration bug.</p></li>
<li><p>Fix support for PGI‘18 compiler.</p></li>
<li><p>Fix run-time linker issues with OMPIO on newer Linux distros.</p></li>
<li><p>Allow the user to override modulefile_path in the Open MPI SRPM,
even if <code class="docutils literal notranslate"><span class="pre">install_in_opt</span></code> is set to 1.</p></li>
<li><p>Properly detect ConnectX-6 HCAs in the openib BTL.</p></li>
<li><p>Fix segfault in the MTL/OFI initialization for large jobs.</p></li>
<li><p>Fix various portals4 control flow bugs.</p></li>
<li><p>Fix communications ordering for alltoall and Cartesian neighborhood
collectives.</p></li>
<li><p>Fix an infinite recursion crash in the memory patcher on systems
with glibc v2.26 or later (e.g., Ubuntu 18.04) when using certain
OS-bypass interconnects.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-3-0-5">
<h2><span class="section-number">3.1.5.2. </span>Open MPI version 3.0.5<a class="headerlink" href="#open-mpi-version-3-0-5" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>November, 2019</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fix OMPIO issue limiting file reads/writes to 2GB. Thanks to
Richard Warren for reporting the issue.</p></li>
<li><p>At run time, automatically disable Linux cross-memory attach (CMA)
for vader BTL (shared memory) copies when running in user namespaces
(i.e., containers). Many thanks to Adrian Reber for raising the
issue and providing the fix.</p></li>
<li><p>Sending very large MPI messages using the ofi MTL will fail with
some of the underlying Libfabric transports (e.g., PSM2 with
messages >=4GB, verbs with messages >=2GB). Prior version of Open
MPI failed silently; this version of Open MPI invokes the
appropriate MPI error handler upon failure. See
<a class="reference external" href="https://github.com/open-mpi/ompi/issues/7058">https://github.com/open-mpi/ompi/issues/7058</a> for more details.
Thanks to Emmanuel Thomé for raising the issue.</p></li>
<li><p>Fix case where 0-extent datatypes might be eliminated during
optimization. Thanks to Github user @tjahns for raising the issue.</p></li>
<li><p>Ensure that the MPIR_Breakpoint symbol is not optimized out on
problematic platforms.</p></li>
<li><p>Fix OMPIO offset calculations with <code class="docutils literal notranslate"><span class="pre">SEEK_END</span></code> and <code class="docutils literal notranslate"><span class="pre">SEEK_CUR</span></code> in
<code class="docutils literal notranslate"><span class="pre">MPI_FILE_GET_POSITION</span></code>. Thanks to Wei-keng Liao for raising the
issue.</p></li>
<li><p>Fix corner case for datatype extent computations. Thanks to David
Dickenson for raising the issue.</p></li>
<li><p>Fix MPI buffered sends with the “cm” PML.</p></li>
<li><p>Update to PMIx v2.2.3.</p></li>
<li><p>Fix ssh-based tree-based spawning at scale. Many thanks to Github
user @zrss for the report and diagnosis.</p></li>
<li><p>Fix the Open MPI RPM spec file to not abort when grep fails. Thanks
to Daniel Letai for bringing this to our attention.</p></li>
<li><p>Handle new SLURM CLI options (SLURM 19 deprecated some options that
Open MPI was using). Thanks to Jordan Hayes for the report and the
initial fix.</p></li>
<li><p>OMPI: fix division by zero with an empty file view.</p></li>
<li><p>Also handle <code class="docutils literal notranslate"><span class="pre">shmat()</span></code>/<code class="docutils literal notranslate"><span class="pre">shmdt()</span></code> memory patching with OS-bypass networks.</p></li>
<li><p>Add support for unwinding info to all files that are present in the
stack starting from <code class="docutils literal notranslate"><span class="pre">MPI_Init</span></code>, which is helpful with parallel
debuggers. Thanks to James Clark for the report and initial fix.</p></li>
<li><p>Fixed inadvertant use of bitwise operators in the MPI C++ bindings
header files. Thanks to Bert Wesarg for the report and the fix.</p></li>
<li><p>Added configure option <code class="docutils literal notranslate"><span class="pre">--disable-wrappers-runpath</span></code> (alongside the
already-existing <code class="docutils literal notranslate"><span class="pre">--disable-wrappers-rpath</span></code> option) to prevent Open
MPI’s configure script from automatically adding runpath CLI options
to the wrapper compilers.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-3-0-4">
<h2><span class="section-number">3.1.5.3. </span>Open MPI version 3.0.4<a class="headerlink" href="#open-mpi-version-3-0-4" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>April, 2019</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fix compile error when configured with <code class="docutils literal notranslate"><span class="pre">--enable-mpi-java</span></code> and
<code class="docutils literal notranslate"><span class="pre">--with-devel-headers</span></code>. Thanks to @g-raffy for reporting the issue.</p></li>
<li><p>Fix possible floating point rounding and division issues in OMPIO
which led to crashes and/or data corruption with very large data.
Thanks to Axel Huebl and René Widera for identifing the issue,
supplying and testing the fix (** also appeared: v3.0.4).</p></li>
<li><p>Use <code class="docutils literal notranslate"><span class="pre">static_cast<></span></code> in <code class="docutils literal notranslate"><span class="pre">mpi.h</span></code> where appropriate. Thanks to @shadow-fx
for identifying the issue.</p></li>
<li><p>Fix datatype issue with RMA accumulate. Thanks to Jeff Hammond for
raising the issue.</p></li>
<li><p>Fix RMA accumulate of non-predefined datatypes with predefined
operators. Thanks to Jeff Hammond for raising the issue.</p></li>
<li><p>Fix race condition when closing open file descriptors when launching
MPI processes. Thanks to Jason Williams for identifying the issue and
supplying the fix.</p></li>
<li><p>Fix Valgrind warnings for some <code class="docutils literal notranslate"><span class="pre">MPI_TYPE_CREATE_*</span></code> functions. Thanks
to Risto Toijala for identifying the issue and supplying the fix.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">MPI_TYPE_CREATE_F90_{REAL,COMPLEX}</span></code> for r=38 and r=308.</p></li>
<li><p>Fix assembly issues with old versions of gcc (<6.0.0) that affected
the stability of shared memory communications (e.g., with the vader
BTL).</p></li>
<li><p>Fix the OFI MTL handling of <code class="docutils literal notranslate"><span class="pre">MPI_ANY_SOURCE</span></code>.</p></li>
<li><p>Fix noisy errors in the openib BTL with regards to
<code class="docutils literal notranslate"><span class="pre">ibv_exp_query_device()</span></code>. Thanks to Angel Beltre and others who
reported the issue.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-3-0-3">
<h2><span class="section-number">3.1.5.4. </span>Open MPI version 3.0.3<a class="headerlink" href="#open-mpi-version-3-0-3" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>October, 2018</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fix race condition in <code class="docutils literal notranslate"><span class="pre">MPI_THREAD_MULTIPLE</span></code> support of non-blocking
send/receive path.</p></li>
<li><p>Fix error handling <code class="docutils literal notranslate"><span class="pre">SIGCHLD</span></code> forwarding.</p></li>
<li><p>Add support for <code class="docutils literal notranslate"><span class="pre">CHARACTER</span></code> and <code class="docutils literal notranslate"><span class="pre">LOGICAL</span></code> Fortran datatypes for <code class="docutils literal notranslate"><span class="pre">MPI_SIZEOF</span></code>.</p></li>
<li><p>Fix compile error when using OpenJDK 11 to compile the Java bindings.</p></li>
<li><p>Fix crash when using a hostfile with a <a class="reference external" href="mailto:'user%40host">‘user<span>@</span>host</a>’ line.</p></li>
<li><p>Numerous Fortran ‘08 interface fixes.</p></li>
<li><p>TCP BTL error message fixes.</p></li>
<li><p>OFI MTL now will use any provider other than shm, sockets, tcp, udp, or
rstream, rather than only supporting gni, psm, and psm2.</p></li>
<li><p>Disable async receive of CUDA buffers by default, fixing a hang
on large transfers.</p></li>
<li><p>Support the BCM57XXX and BCM58XXX Broadcomm adapters.</p></li>
<li><p>Fix minmax datatype support in ROMIO.</p></li>
<li><p>Bug fixes in vader shared memory transport.</p></li>
<li><p>Support very large buffers with <code class="docutils literal notranslate"><span class="pre">MPI_TYPE_VECTOR</span></code>.</p></li>
<li><p>Fix hang when launching with mpirun on Cray systems.</p></li>
<li><p>Bug fixes in OFI MTL.</p></li>
<li><p>Assorted Portals 4.0 bug fixes.</p></li>
<li><p>Fix for possible data corruption in <code class="docutils literal notranslate"><span class="pre">MPI_BSEND</span></code>.</p></li>
<li><p>Move shared memory file for vader btl into <code class="docutils literal notranslate"><span class="pre">/dev/shm</span></code> on Linux.</p></li>
<li><p>Fix for <code class="docutils literal notranslate"><span class="pre">MPI_ISCATTER</span></code>/<code class="docutils literal notranslate"><span class="pre">MPI_ISCATTERV</span></code> Fortran interfaces with <code class="docutils literal notranslate"><span class="pre">MPI_IN_PLACE</span></code>.</p></li>
<li><p>Upgrade PMIx to v2.1.4.</p></li>
<li><p>Fix for Power9 built-in atomics.</p></li>
<li><p>Numerous One-sided bug fixes.</p></li>
<li><p>Fix for race condition in uGNI BTL.</p></li>
<li><p>Improve handling of large number of interfaces with TCP BTL.</p></li>
<li><p>Numerous UCX bug fixes.</p></li>
<li><p>Add support for QLogic and Broadcom Cumulus RoCE HCAs to Open IB BTL.</p></li>
<li><p>Add patcher support for aarch64.</p></li>
<li><p>Fix hang on Power and ARM when Open MPI was built with low compiler
optimization settings.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-3-0-2">
<h2><span class="section-number">3.1.5.5. </span>Open MPI version 3.0.2<a class="headerlink" href="#open-mpi-version-3-0-2" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>June, 2018</p>
</dd>
</dl>
<ul class="simple">
<li><p>Disable osc/pt2pt when using <code class="docutils literal notranslate"><span class="pre">MPI_THREAD_MULTIPLE</span></code> due to numerous
race conditions in the component.</p></li>
<li><p>Fix dummy variable names for the mpi and mpi_f08 Fortran bindings to
match the MPI standard. This may break applications which use
name-based parameters in Fortran which used our internal names
rather than those documented in the MPI standard.</p></li>
<li><p>Fixed <code class="docutils literal notranslate"><span class="pre">MPI_SIZEOF</span></code> in the “mpi” Fortran module for the NAG compiler.</p></li>
<li><p>Fix RMA function signatures for <code class="docutils literal notranslate"><span class="pre">use-mpi-f08</span></code> bindings to have the
asynchonous property on all buffers.</p></li>
<li><p>Fix Fortran <code class="docutils literal notranslate"><span class="pre">MPI_COMM_SPAWN_MULTIPLE</span></code> to properly follow the count
length argument when parsing the array_of_commands variable.</p></li>
<li><p>Revamp Java detection to properly handle new Java versions which do
not provide a javah wrapper.</p></li>
<li><p>Improved configure logic for finding the UCX library.</p></li>
<li><p>Add support for HDR InfiniBand link speeds.</p></li>
<li><p>Disable the POWER 7/BE block in configure. Note that POWER 7/BE is
still not a supported platform, but it is no longer automatically
disabled. See
<a class="reference external" href="https://github.com/open-mpi/ompi/issues/4349#issuecomment-374970982">https://github.com/open-mpi/ompi/issues/4349#issuecomment-374970982</a>
for more information.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-3-0-1">
<h2><span class="section-number">3.1.5.6. </span>Open MPI version 3.0.1<a class="headerlink" href="#open-mpi-version-3-0-1" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>March, 2018</p>
</dd>
</dl>
<ul class="simple">
<li><p>Fix ability to attach parallel debuggers to MPI processes.</p></li>
<li><p>Fix a number of issues in MPI I/O found by the HDF5 test suite.</p></li>
<li><p>Fix (extremely) large message transfers with shared memory.</p></li>
<li><p>Fix out of sequence bug in multi-NIC configurations.</p></li>
<li><p>Fix stdin redirection bug that could result in lost input.</p></li>
<li><p>Disable the LSF launcher if CSM is detected.</p></li>
<li><p>Plug a memory leak in <code class="docutils literal notranslate"><span class="pre">MPI_Mem_free()</span></code>. Thanks to Philip Blakely for reporting.</p></li>
<li><p>Fix the tree spawn operation when the number of nodes is larger than the radix.
Thanks to Carlos Eduardo de Andrade for reporting.</p></li>
<li><p>Fix Fortran 2008 macro in MPI extensions. Thanks to Nathan T. Weeks for
reporting.</p></li>
<li><p>Add UCX to list of interfaces that OpenSHMEM will use by default.</p></li>
<li><p>Add <code class="docutils literal notranslate"><span class="pre">--{enable|disable}-show-load-errors-by-default</span></code> to control
default behavior of the load errors option.</p></li>
<li><p>OFI MTL improvements: handle empty completion queues properly, fix
incorrect error message around <code class="docutils literal notranslate"><span class="pre">fi_getinfo()</span></code>, use default progress
option for provider by default, Add support for reading multiple
CQ events in ofi_progress.</p></li>
<li><p>PSM2 MTL improvements: Allow use of GPU buffers, thread fixes.</p></li>
<li><p>Numerous corrections to memchecker behavior.</p></li>
<li><p>Add a mca parameter <code class="docutils literal notranslate"><span class="pre">ras_base_launch_orted_on_hn</span></code> to allow for launching
MPI processes on the same node where mpirun is executing using a separate
orte daemon, rather than the mpirun process. This may be useful to set to
true when using SLURM, as it improves interoperability with SLURM’s signal
propagation tools. By default it is set to false, except for Cray XC systems.</p></li>
<li><p>Fix a problem reported on the mailing separately by Kevin McGrattan and Stephen
Guzik about consistency issues on NFS file systems when using OMPIO. This fix
also introduces a new mca parameter <code class="docutils literal notranslate"><span class="pre">fs_ufs_lock_algorithm</span></code> which allows to
control the locking algorithm used by ompio for read/write operations. By
default, ompio does not perfom locking on local UNIX file systems, locks the
entire file per operation on NFS file systems, and selective byte-range
locking on other distributed file systems.</p></li>
<li><p>Add an mca parameter <code class="docutils literal notranslate"><span class="pre">pmix_server_usock_connections</span></code> to allow mpirun to
support applications statically built against the Open MPI v2.x release,
or installed in a container along with the Open MPI v2.x libraries. It is
set to false by default.</p></li>
</ul>
</div>
<div class="section" id="open-mpi-version-3-0-0">
<h2><span class="section-number">3.1.5.7. </span>Open MPI version 3.0.0<a class="headerlink" href="#open-mpi-version-3-0-0" title="Permalink to this heading"></a></h2>
<dl class="field-list simple">
<dt class="field-odd">Date</dt>
<dd class="field-odd"><p>September, 2017</p>
</dd>
</dl>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>Major new features:</p>
<ul class="simple">
<li><p>Use UCX allocator for OSHMEM symmetric heap allocations to optimize intra-node
data transfers. UCX SPML only.</p></li>
<li><p>Use UCX multi-threaded API in the UCX PML. Requires UCX 1.0 or later.</p></li>
<li><p>Added support for Flux PMI</p></li>
<li><p>Update embedded PMIx to version 2.1.0</p></li>
<li><p>Update embedded hwloc to version 1.11.7</p></li>
</ul>
</div>
<ul class="simple">
<li><p>Per Open MPI’s versioning scheme (see the README), increasing the
major version number to 3 indicates that this version is not
ABI-compatible with prior versions of Open MPI. In addition, there may
be differences in MCA parameter names and defaults from previous releases.
Command line options for mpirun and other commands may also differ from
previous versions. You will need to recompile MPI and OpenSHMEM applications
to work with this version of Open MPI.</p></li>
<li><p>With this release, Open MPI supports <code class="docutils literal notranslate"><span class="pre">MPI_THREAD_MULTIPLE</span></code> by default.</p></li>
<li><p>New configure options have been added to specify the locations of libnl
and zlib.</p></li>
<li><p>A new configure option has been added to request Flux PMI support.</p></li>
<li><p>The help menu for mpirun and related commands is now context based.
<code class="docutils literal notranslate"><span class="pre">mpirun</span> <span class="pre">--help</span> <span class="pre">compatibility</span></code> generates the help menu in the same format
as previous releases.</p></li>
</ul>
<div class="admonition attention">
<p class="admonition-title">Attention</p>
<p>Removed legacy support:</p>
<ul class="simple">
<li><p>AIX is no longer supported.</p></li>
<li><p>Loadlever is no longer supported.</p></li>
<li><p>OpenSHMEM currently supports the UCX and MXM transports via the ucx and ikrit
SPMLs respectively.</p></li>
<li><p>Remove IB XRC support from the OpenIB BTL due to lack of support.</p></li>
<li><p>Remove support for big endian PowerPC.</p></li>
<li><p>Remove support for XL compilers older than v13.1</p></li>
</ul>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Known issues:</p>
<ul class="simple">
<li><p>MPI_Connect/accept between applications started by different mpirun
commands will fail, even if ompi-server is running.</p></li>
</ul>
</div>
</div>
</div>
</div>
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