MVAPICH - Announcing the release of MVAPICH2 2.0rc2 and MVAPICH2-X 2.0rc2

The MVAPICH team is pleased to announce the release of MVAPICH2 2.0rc2 and MVAPICH2-X 2.0rc2 (Hybrid MPI+PGAS (OpenSHMEM) with Unified Communication Runtime).

Features, Enhancements, and Bug Fixes for MVAPICH2 2.0rc2 (since
MVAPICH2 2.0rc1 release) are listed here.

* Features and Enhancements (since 2.0rc1):
    - CMA support is now enabled by default
    - Optimization of collectives with CMA support
    - RMA optimizations for shared memory and atomic operations
    - Tuning RGET and Atomics operations
    - Tuning RDMA FP-based communication 
    - MPI-T support for additional performance and control variables
    - The --enable-mpit-pvars=yes configuration option will now
      enable only MVAPICH2 specific variables
    - Large message transfer support for PSM interface
    - Optimization of collectives for PSM interface
    - Updated to hwloc v1.9

* Bug-Fixes (since 2.0rc1):
    - Fix multicast hang when there is a single process on one node
      and more than one process on other nodes
    - Fix non-power-of-two usage of scatter-doubling-allgather algorithm
    - Fix for bcastzero type hang during finalize
    - Enhanced handling of failures in RDMA_CM based
      connection establishment
    - Fix for a hang in finalize when using RDMA_CM
    - Finish receive request when RDMA READ completes in RGET protocol
    - Always use direct RDMA when flush is used
    - Fix compilation error with --enable-g=all in PSM interface
    - Fix warnings and memory leaks

MVAPICH2-X 2.0rc2 software package provides support for hybrid MPI+PGAS (UPC and OpenSHMEM) programming models with unified communication runtime for emerging exascale systems. This software package provides flexibility for users to write applications using the following programming models with a unified communication runtime: MPI, MPI+OpenMP, pure UPC, and pure OpenSHMEM programs as well as hybrid MPI(+OpenMP) + PGAS (UPC and OpenSHMEM) programs.

Features and enhancements for MVAPICH2-X 2.0rc2 (since MVAPICH2-X 2.0rc1) are as follows:

* Features and Enhancements (since 2.0rc1):
    - MPI Features
        - Based on MVAPICH2 2.0rc2 (OFA-IB-CH3 interface)

    - Unified Runtime Features
        - Based on MVAPICH2 2.0rc2 (OFA-IB-CH3 interface). All the
          runtime features enabled by default in OFA-IB-CH3 interface
          of MVAPICH2 2.0rc2 are available in MVAPICH2-X 2.0rc2

For downloading MVAPICH2 2.0rc2 and MVAPICH2-X 2.0rc2, associated user guides, quick start guide, and accessing the SVN, please visit the following URL: http://mvapich.cse.ohio-state.edu

Announcing the Release of MVAPICH2 2.0b, MVAPICH2-X 2.0b and OSU Micro-Benchmarks (OMB) 4.2

The MVAPICH team is pleased to announce the release of MVAPICH2 2.0b,
MVAPICH2-X 2.0b (Hybrid MPI+PGAS (OpenSHMEM) with Unified
Communication Runtime) and OSU Micro-Benchmarks (OMB) 4.2.
Features, Enhancements, and Bug Fixes for MVAPICH2 2.0b (since
MVAPICH2 2.0a release) are listed here.
* Features and Enhancements (since 2.0a):
    - Based on MPICH-3.1b1
    - Multi-rail support for GPU communication
    - Non-blocking streams in asynchronous CUDA transfers for
      better overlap
    - Initialize GPU resources only when used by MPI transfer
    - Extended support for MPI-3 RMA in OFA-IB-CH3, OFA-IWARP-CH3, and
      OFA-RoCE-CH3
    - Additional MPIT counters and performance variables
    - Updated compiler wrappers to remove application dependency
      on network and other extra libraries
        - Thanks to Adam Moody from LLNL for the suggestion
    - Capability to checkpoint CH3 channel using the Hydra process manager
    - Optimized support for broadcast, reduce and other collectives
    - Tuning for IvyBridge architecture
    - Improved launch time for large-scale mpirun_rsh jobs
    - Introduced retry mechanism in mpirun_rsh for socket binding
    - Updated hwloc to version 1.7.2
* Bug-Fixes (since 2.0a):
    - Consider list provided by MV2_IBA_HCA when scanning device list
    - Fix issues in Nemesis interface with --with-ch3-rank-bits=32
    - Better cleanup of XRC files in corner cases
    - Initialize using better defaults for ibv_modify_qp (initial ring)
    - Add unconditional check and addition of pthread library
    - MPI_Get_library_version updated with proper MVAPICH2 branding
        - Thanks to Jerome Vienne from the TACC for the report
MVAPICH2-X 2.0b software package provides support for hybrid MPI+PGAS
(UPC and OpenSHMEM) programming models with unified communication
runtime for emerging exascale systems. This software package
provides flexibility for users to write applications using the
following programming models with a unified communication runtime:
MPI, MPI+OpenMP, pure UPC, and pure OpenSHMEM programs as well as
hybrid MPI(+OpenMP) + PGAS (UPC and OpenSHMEM) programs.
Features, enhancements and bug-fixes for MVAPICH2-X 2.0b
(since MVAPICH2-X 2.0a) are as follows:
* Features and Enhancements (since 2.0a)
    - OpenSHMEM Features
        - Based on OpenSHMEM reference implementation 1.0e
        - Enhanced optimization of OpenSHMEM collectives (shmem_collect,
          shmem_fcollect, shmem_barrier, shmem_reduce, and shmem_broadcast)
        - Optimized shmalloc routine
    - UPC Features
        - Based on Berkeley UPC 2.18.0
        - Support for GUPC translator
    - MPI Features
        - Based on MVAPICH2 2.0b (OFA-IB-CH3 interface)
    - Unified Runtime Features
        - Based on MVAPICH2 2.0b (OFA-IB-CH3 interface). All the runtime
          features enabled by default in OFA-IB-CH3 interface of
          MVAPICH2 2.0b are available in MVAPICH2-X 2.0b
* Bug Fixes (since 2.0a):
    - OpenSHMEM Bug Fixes
        - Fixed synchronization issue in shmem_fence
        - Fixed issue in shmem_collect which prevented variable length
          collect routine
New features and Enhancements of OSU Micro-Benchmarks (OMB) 4.2 (since
OMB 4.1 release) are listed here.
* New Features & Enhancements
    - New OpenSHMEM benchmarks
        * osu_oshm_fcollect
    - Enable handling of GPU device buffers in all MPI collective benchmarks
    - Add device binding for OpenACC benchmarks
* Bug Fixes
    - Add upc_fence after memput in osu_upc_memput benchmark
    - Removed incorrect reuse of pSync in OpenSHMEM benchmarks
        - Thanks Sayan Ghosh for the report
    - Correct CUDA configuration example in README
    - Fix several warnings
For downloading MVAPICH2 2.0b, MVAPICH2-X 2.0b, OMB 4.2, associated
user guides, quick start guide, and accessing the SVN, please visit
the following URL:
http://mvapich.cse.ohio-state.edu