We are pleased to announce that we have just released MPICH 4.1a1. It is available at https://www.mpich.org/downloads/. This release is the first alpha release for 4.1 release series. Major features include PMI refactor, MPIX stream experimental API, build and testing enhancements, and many fixes and improvements. In addition to the usual mpich and hydra tarballs, starting with this release, we also release libpmi and mpich-testsuite tarballs for use cases outside MPICH. The MPIX stream prototypes are experimental ideas to address explicit mapping of execution context for MPI+thread and MPI+CUDA applications. For more information, see https://github.com/pmodels/mpich/discussions/5908. Discussions and feedback are welcome. [https://opengraph.githubassets.com/c83c43818f4f946bc1cfb26ba20d3e17e7bc661807dd0a91f68c2dc733df07aa/pmodels/mpich/discussions/5908]<https://github.com/pmodels/mpich/discussions/5908> MPIX_Stream · Discussion #5908 · pmodels/mpich<https://github.com/pmodels/mpich/discussions/5908> MPIX_Stream Background motivation MPI is ambiguous on its multi-thread model. Most of the text implies a serial model -- (with `MPI_THREAD_MULTIPLE) the outcome will be as if the calls were execute... github.com [https://www.mpich.org/files/2012/10/rnd100_home.jpg1zB]<https://www.mpich.org/downloads/> Downloads | MPICH<https://www.mpich.org/downloads/> “The Oscars of Invention” – The Chicago Tribune For 45 years, the prestigious R&D 100 Awards have been helping companies provide the important initial push a new product needs to compete successfully in the marketplace. The winning of an R&D 100 Award provides a mark of excellence known to industry, government, and academia as proof that the product is one of the most innovative ideas of ... www.mpich.org -- Hui Zhou [email protected] 630-252-3430