[mpich-announce] Announcing the availability of MPICH 3.3b2

[Kenneth Raffenetti]

Correction: the original subject line stated the wrong version number. 
Today's release is 3.3b2.

On 04/10/2018 09:45 AM, Kenneth Raffenetti wrote:
> A new preview release of MPICH, 3.3b2, is now available for download. 
> 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>
> 
> CH4 is still in beta stages, meaning there are known build issues and 
> bugs, but most tests and common benchmarks will complete on 64-bit Linux 
> systems. Since 3.3b1, there have been more stability improvements, bug 
> fixes, and code cleanup. PMIx client library support is added in CH4 to 
> support launching with a compatible PMIx server.
> 
> Also in this release is a reorganization of MPI collectives to make it 
> easier to integrate new algorithms. A new framework is added to enable 
> collective algorithms on either generic or device-specific functionality 
> using a C++-template style system. Support is added for creating 
> communicators based on hardware topology hints, and SLURM integration in 
> Hydra is updated to work with the latest node list format. You can find 
> the release on our downloads page (www.mpich.org/downloads).
> 
> Regards,
> The MPICH team
> 
> =============================================================================== 
> 
>                                 Changes in 3.3
> =============================================================================== 
> 
> 
>   # CH4 Device: A new device layer implementation designed for low software
>     overheads. CH4 has experimental support for OFI and UCX network 
> libraries,
>     and POSIX shared memory. Thanks to Intel, Mellanox, and RIKEN AICS for
>     participating in the CH4 coding effort.
> 
>   # Added support for splitting communicators based on hardware
>     topology using info hints.
> 
>   # Fixed SLURM integration in Hydra for new node list format.
> 
>   # Added support for PMIx (https://pmix.github.io/pmix/) client
>     library in CH4 netmods. Note that you must use a compatible PMIx
>     server in this configuration.
> 
>   # Better organization of collectives in the MPI layer. The new
>     scheme, which de-couples implementation from selection logic,
>     enables easier integration of additional algorithms.
> 
>   # TSP collectives framework: A C++-template style framework for
>     collective algorithms is added to allow single collective
>     implementation to move data over generic or device-specific
>     transport functions.
> 
>   # Improvements to derived datatype testing (DTPools -
>     https://wiki.mpich.org/mpich/index.php/DTPools).
> 
>   # Added new "non-catastrophic" error codes to expose internal
>     resource exhaustion.
> 
>   # Cleanup of whitespace (ch3 excluded) using the
>     maint/code-cleanup.sh script. For instructions on how to update
>     PRs/branches based on MPICH before the cleanup, see
>     https://github.com/pmodels/mpich/wiki/Code-Cleanup-Procedure.
> 
>   # Removed the PAMI device and poe PMI client.
> 
>   # Several other minor bug fixes, memory leak fixes, and code cleanup.
> 
>     A full list of changes is available at the following link:
> 
>       http://git.mpich.org/mpich.git/shortlog/v3.2..v3.3b2
> 
>     A list of bugs that have been fixed is available at the following
>     link:
> 
>       https://github.com/pmodels/mpich/milestone/32?closed=1
> 
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