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<p class="MsoNormal"><span style="font-size:11.0pt">A new release candidate of MPICH, 4.3.0rc2, is now available for download. Since rc1, we have fixed a compilation issue with the C++ bindings and added back the handle conversion macros (f2c/c2f) for ABI compatibility.
See the CHANGES below for a detailed list of features.<br>
<br>
At this stage, only critical bugs will be fixed before the 4.3.0 GA release. Please give it a try!<br>
<br>
You can find the release on our downloads page (<a href="https://urldefense.us/v3/__https://www.mpich.org/downloads/__;!!G_uCfscf7eWS!Z27hDjhF1tlpi1NeEQzhpaThPUgM5JeIsJIJnv-LL4RNnba47XpsHxfm4fRkHGb86jT9P8wo7molrppq$">https://www.mpich.org/downloads/</a>)<br>
<br>
Regards,<br>
The MPICH team<br>
<br>
===============================================================================</span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Changes in 4.3</span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Support MPI memory allocation kinds side document.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Support MPI ABI Proposal. Configure with --enable-mpi-abi and build with</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> mpicc_abi. By default, mpicc still builds and links with MPICH ABI.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Experimental API MPIX_Op_create_x. It supports user callback function with</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> extra_state context and op destructor callback. It supports language bindings</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> to use proxy function for language-specific user callbacks.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Experimental API MPIX_{Comm,File,Session,Win}_create_errhandler_x. They allow</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> user error handlers to have extra_state context and corresponding destructor.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> This allows language bindings to implement user error handlers via proxy.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Experimental API MPIX_Request_is_complete. This is a pure request state query</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> function that will not invoke progress, nor will free the request. This should</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> help applications that want separate task dependency checking from progress</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> engine to avoid progress contentions, especially in multi-threaded context.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> It is also useful for tools to profile non-deterministic calls such as</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> MPI_Test.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Experimental API MPIX_Async_start. This function let applications to inject</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> progress hooks to MPI progress. It allows application to implement custom</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> asynchronous operations that will be progressed by MPI. It avoids having to</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> implement separate progress mechanisms that may either take additional</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> resource or contend with MPI progress and negatively impact performance. It</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> also allows applications to create custom MPI operations, such as MPI</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> nonblocking collectives, and achieve near native performance.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Added benchmark tests test/mpi/bench/p2p_{latency,bw}.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Added CMA support in CH4 IPC.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Added IPC read algorithm for intranode Allgather and Allgatherv.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Added CVAR MPIR_CVAR_CH4_SHM_POSIX_TOPO_ENABLE to enable non-temporal memcpy</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> for inter-numa shm communication.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Added CVAR MPIR_CVAR_DEBUG_PROGRESS_TIMEOUT for debugging MPI deadlock issues.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># ch4:ucx now supports dynamic processes. MPI_Comm_spawn{_multiple} will work.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> MPI_Open_port will fail due to ucx port name exceeds current MPI_MAX_PORT_NAME</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> of 256. One can work around by use an info hint "port_name_size" and use a</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> larger port name buffer.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># PMI-1 defines PMI_MAX_PORT_NAME, which may be different from MPI_MAX_PORT_NAME.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> This is used by "PMI_Lookup_name". Consequently, MPI_Lookup_name accepts info</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> hint "port_name_size" that may be larger than MPI_MAX_PORT_NAME. If the port</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> name does not fit in "port_name_size", it will return a truncation error.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Autogen default to use -yaksa-depth=2.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Default MPIR_CVAR_CH4_ROOTS_ONLY_PMI to on.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Added ch4 netmod API am_tag_send and am_tag_recv.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Added MPIR_CVAR_CH4_OFI_EAGER_THRESHOLD to force RNDV send mode.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"># Make check target will run ROMIO tests.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"># Add back handle conversion macros (f2c/c2f) to preserve ABI<o:p></o:p></p>
<p class="MsoNormal"> compatibility with older MPICH libraries<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># Fix compilation issue with g++ in -std=gnu++20 mode</p>
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