A new stable release of MPICH, 3.3, is now available for download. This is the first stable release in the 3.3 series. It contains several new features, enhancements and bug fixes. A detailed list of changes can be found here: https://github.com/pmodels/mpich/blob/master/CHANGES
All production environments are encouraged to upgrade to this release.
MPICH 3.3 contains a new (non-default) device layer implementation – CH4. CH4 is designed for low software overheads to better exploit next-generation hardware. An OFI (http://libfabric.org) or UCX (http://openucx.org) library is required to build CH4. Example configure lines:
./configure --with-device=ch4:ofi --with-libfabric=<path/to/ofi/install>
./configure --with-device=ch4:ucx --with-ucx=<path/to/ucx/install>