To: J3                                                     J3/21-153
From: Bill Long
Subject: MPI Liaison Report
Date: 2021-June-21

M224 MPI Liaison report:

Major additions for MPI 4.0

- Solution for "Big Count" operations  (allow 64-bit integer counts)

- Persistent Collectives

- Partitioned Communication

- Topology Solutions

- New init options via MPI Sessions

- Simple fault handling to enable fault tolerance solutions

- New tool interface for events

- Reworking of the terms chapter

MPI 4.0 was released on June 9, 2021.

For details: https://www.mpi-forum.org/

The full standard is here:

https://www.mpi-forum.org/docs/mpi-4.0/mpi40-report.pdf