A new release candidate of MPICH, 4.0rc1, is now available for download. This is the first release candidate in the 4.0 series. This release is feature complete and includes support for all new MPI-4.0 APIs. The full set of changes since 4.0b1 can be found here: https://github.com/pmodels/mpich/compare/v4.0b1…v4.0rc1.
Also in this release are several bugs fixes (thanks to user reports) and improvements in ch3, hydra, and common MPICH code. You can find the release on our downloads page.
At this stage, only critical bugs will be fixed before the 4.0 GA release. Please give it a try and report any issues!
