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MPICH team is happy to announce the release of version 4.3.0b1. It is now available for download at <a href="https://urldefense.us/v3/__https://www.mpich.org/downloads__;!!G_uCfscf7eWS!fCg7k2tCFpzCTlJO36fN24ekIYv8ZfCfkHWjKtl34Wnkhdak0jMgZYuJ473Er_MwmP2eNA15jT7Q$">https://www.mpich.org/downloads</a>.</div>
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This is the first beta release for the MPICH 4.3.x series.</div>
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Regards,</div>
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The MPICH team</div>
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===============================================================================</div>
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Changes in 4.3</div>
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===============================================================================</div>
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# Support MPI memory allocation kinds side document.</div>
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# Support MPI ABI Proposal. Configure with --enable-mpi-abi and build with</div>
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mpicc_abi. By default, mpicc still builds and links with MPICH ABI.</div>
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# Experimental API MPIX_Op_create_x. It supports user callback function with</div>
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extra_state context and op destructor callback. It supports language bindings</div>
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to use proxy function for language-specific user callbacks.</div>
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# Experimental API MPIX_{Comm,File,Session,Win}_create_errhandler_x. They allow</div>
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user error handlers to have extra_state context and corresponding destructor.</div>
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This allows language bindings to implement user error handlers via proxy.</div>
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# Experimental API MPIX_Request_is_complete. This is a pure request state query</div>
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function that will not invoke progress, nor will free the request. This should</div>
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help applications that want separate task dependency checking from progress</div>
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engine to avoid progress contentions, especially in multi-threaded context.</div>
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It is also useful for tools to profile non-deterministic calls such as</div>
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MPI_Test.</div>
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# Experimental API MPIX_Async_start. This function let applications to inject</div>
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progress hooks to MPI progress. It allows application to implement custom</div>
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asynchronous operations that will be progressed by MPI. It avoids having to</div>
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implement separate progress mechanisms that may either take additional</div>
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resource or contend with MPI progress and negatively impact performance. It</div>
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also allows applications to create custom MPI operations, such as MPI</div>
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nonblocking collectives, and achieve near native performance.</div>
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# Added benchmark tests test/mpi/bench/p2p_{latency,bw}.</div>
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# Added CMA support in CH4 IPC.</div>
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# Added IPC read algorithm for intranode Allgather and Allgatherv.</div>
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# Added CVAR MPIR_CVAR_CH4_SHM_POSIX_TOPO_ENABLE to enable non-temporal memcpy</div>
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for inter-numa shm communication.</div>
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# Added CVAR MPIR_CVAR_DEBUG_PROGRESS_TIMEOUT for debugging MPI deadlock issues.</div>
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# ch4:ucx now supports dynamic processes. MPI_Comm_spawn{_multiple} will work.</div>
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MPI_Open_port will fail due to ucx port name exceeds current MPI_MAX_PORT_NAME</div>
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of 256. One can work around by use an info hint "port_name_size" and use a</div>
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larger port name buffer.</div>
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# PMI-1 defines PMI_MAX_PORT_NAME, which may be different from MPI_MAX_PORT_NAME.</div>
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This is used by "PMI_Lookup_name". Consequently, MPI_Lookup_name accepts info</div>
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hint "port_name_size" that may be larger than MPI_MAX_PORT_NAME. If the port</div>
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name does not fit in "port_name_size", it will return a truncation error.</div>
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# Autogen default to use -yaksa-depth=2.</div>
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# Default MPIR_CVAR_CH4_ROOTS_ONLY_PMI to on.</div>
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# Added ch4 netmod API am_tag_send and am_tag_recv.</div>
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# Added MPIR_CVAR_CH4_OFI_EAGER_THRESHOLD to force RNDV send mode.</div>
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# Make check target will run ROMIO tests.</div>
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