MPC_4.4.0

[4.4.0] - 2026-08-04

Added

• Rail Portals
  • Added BXI version 3 support
• Low Comm
  • New lowcomm top level one sided communication interface
• OpenSHMEM
  • New network module based on a subpart of the OpenSHMEM specification

Changed

• MPI
  • Added MPI 4.1 errors
• Low Comm
  • Unify Lowcomm API using sendmode preparing integration of UBCL component

Fixed

• Low Comm
  • LCP active message rendezvous container memory leak
  • Finish the implementation of the various types of flush
  • CMA support test between processes leading to more communications going though CMA
  • Atomics with double precision floating point numbers
  • Synchronize host and NIC memory in Portals flushes
• MPI
  • Compute the correct inclusive UB for predefined datatypes
  • Handle NULL MPI_Info duplication
  • Comm_split special case: duplicate the communicator when only one color instead of referencing it
• OpenMP
  • Fix omp_get_max_threads to give a lower bound estimation with respect to topology when in hybrid MPI/OpenMP mode.