[mpich-announce] Announcing the availability of MPICH 4.0rc1

Raffenetti, Ken raffenet at anl.gov
Wed Dec 22 08:46:09 CST 2021

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.

At this stage, only critical bugs will be fixed before the 4.0 GA release. Please give it a try!

You can find the release on our downloads page (https://www.mpich.org/downloads/).

The MPICH team

                               Changes in 4.0

# All MPI-4 APIs have been implemented. Major MPI-4 features include MPI
  sessions, partitioned point-to-point communications, events in the MPI tool
  information interface, large-count functions, persistent collectives,
  MPI_Comm_idup_with_info, MPI_Isendrecv and MPI_Isendrecv_replace,
  MPI_Info_get_string, MPI_Comm_split_type with new split_type --

# Add QMPI (experimental) support.

# Add MPIX_Delete_error_{class,code,string}.

# MPI_Info objects can be accessed before MPI_Init{_thread}.

# Generate C API interface functions including man page notes and error
  checking using Python scripts.

# Generate Fortran (mpif.h, mpi_f08) bindings using Python scripts.

# Generate collective entrance functions and generate per-algorithm tests.

# Support explicit --without-cuda configure option.

# Drop support for UCX version < 1.7.0.

# Configure now optionally require Python 3 (when F08 is enabled).

# Multi-NIC support in ch4:ofi.

# Default to ch4:ofi when configure doesn't have a clear choice. Add message
  block at the end of configure to advise user.

# Multiple VCI is fully implemented including the active message fallback paths.

# Extend IPC to support non-contig datatypes.

# Add AMD GPU support using HIP.

# Add generic RNDV callback mechanism with active messages.

# Refactor ch4 dynamic process functions.

# Avoid building MPL and hwloc multiple times.

# Fix MPIX_Query_cuda_support.

# Many bug fixes and code clean-ups.

   A full list of changes is available at the following link:


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