The MVAPICH team is pleased to announce the release of MVAPICH2 2.3.4 GA and OSU Micro-Benchmarks (OMB) 5.6.3.

Features and enhancements for MVAPICH2 2.3.4 GA are as follows:

* Features and Enhancements (since 2.3.3):

• Improved performance for small message collective operations
• Improved performance for data transfers from/to non-contiguous buffers used by user-defined datatypes
• Add custom API to identify if MVAPICH2 has in-built CUDA support
• New API ‘MPIX_Query_cuda_support’ defined in mpi-ext.h
  • New macro ‘MPIX_CUDA_AWARE_SUPPORT’ defined in mpi-ext.h
• Add support for MPI_REAL16 based reduction operations for Fortran programs
  • MPI_SUM, MPI_MAX, MPI_MIN, MPI_LAND, MPI_LOR, MPI_MINLOC, and MPI_MAXLOC
  • Thanks to Greg Lee@LLNL for the report and reproduced
  • Thanks to Hui Zhou@ANL for the initial patch
• Add support to intercept aligned_alloc in ptmalloc
  • Thanks to Ye Luo @ANL for the report and the reproduced
• Add support to enable fork safety in MVAPICH2 using environment variable
  • “MV2_SUPPORT_FORK_SAFETY”
• Add support for user to modify QKEY using environment variable
  • “MV2_DEFAULT_QKEY”
• Add multiple MPI_T PVARs and CVARs for point-to-point and collective operations
• Enhanced point-to-point and collective tuning for AMD EPYC Rome, Frontera@TACC, Longhorn@TACC, Mayer@Sandia, Pitzer@OSC, Catalyst@EPCC, Summit@ORNL, Lassen@LLNL, and Sierra@LLNL systems
• Give preference to CMA if LiMIC2 and CMA are enabled at the same time
• Move -lmpi, -lmpicxx, and -lmpifort before other LDFLAGS in compiler wrappers like mpicc, mpicxx, mpif77, and mpif90
• Allow passing flags to nvcc compiler through environment variable NVCCFLAGS
• Display more meaningful error messages for InfiniBand asynchronous events
• Add support for AMD Optimizing C/C++ (AOCC) compiler v2.1.0
• Add support for GCC compiler v10.1.0
  • Requires setting FFLAGS=-fallow-argument-mismatch at configure time
• Update to hwloc v2.2.0

 

* Bug Fixes (since 2.3.3):

• Fix compilation issue with IBM XLC++ compilers and CUDA 10.2
• Fix hangs with MPI_Get operations win UD-Hybrid mode
• Initialize MPI3 data structures correctly to avoid random hangs caused by garbage values
• Fix corner case with LiMIC2 and MPI3 one-sided operations
• Add proper fallback and warning message when shared RMA window cannot be created
• Fix race condition in calling mv2_get_path_rec_sl by introducing mutex
  • Thanks to Alexander Melnikov for reporting the issue and providing the patch
• Fix mapping generation for the cases where hwloc returns zero on non-numa machines
  • Thanks to Honggang Li @Red Hat for the report and initial patch
• Fix issues with InfiniBand registration cache and PGI20 compiler
• Fix warnings raised by Coverity scans
  • Thanks to Honggang Li @Red Hat for the report
• Fix bad baseptr address returned from MPI_Win_shared_query
  • Thanks to Adam Moody@LLNL for the report and discussion
• Fix issues with HCA selection logic in heterogeneous multi-rail scenarios
• Fix spelling mistake in error message
  • Thanks to Bill Long and Krishna Kandalla @Cray/HPE for the report
• Fix compilation warnings and memory leaks

 

New features, enhancements and bug fixes for OSU Micro-Benchmarks

(OMB) 5.6.3 are listed here

* New Features & Enhancements (since v5.6.2)

• Add support for benchmarking applications that use ‘fork’ system call

* osu_latency_mp

 

* Bug Fixes (since v5.6.2)

• Fix compilation issue with IBM XLC++ compilers and CUDA 10.2
• Allow passing flags to nvcc compiler
• Fix issues in window creation with host-to-device and device-to-host transfers for one-sided tests

For downloading MVAPICH2 2.3.4 GA, OMB 5.6.3, and associated user guides, quick start guide, and accessing the SVN, please visit the following URL:

http://mvapich.cse.ohio-state.edu