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OSHMPI 2.1 Alpha Release 1

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@minsii minsii released this 23 Dec 21:30
· 81 commits to main since this release
v2.1a1
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Learn about vigilant mode.

Preview version to support CPU-initiated GPU communication.

  • Allow user to specify the GPU awareness in underlying MPI implementation
    via environment variable OSHMPI_MPI_GPU_FEATURES ("pt2pt,put,get,acc",
    default all).

  • Support active message based RMA (i.e., using MPI PT2PT). Disable by default.

  • Support memory space with CUDA memory kind. New APIs include:

void shmemx_space_create(shmemx_space_config_t space_config, shmemx_space_t * space)
void shmemx_space_destroy(shmemx_space_t space)
int shmemx_space_create_ctx(shmemx_space_t space, long options, shmem_ctx_t * ctx)
void shmemx_space_attach(shmemx_space_t space)
void shmemx_space_detach(shmemx_space_t space)
void *shmemx_space_malloc(shmemx_space_t space, size_t size)
void *shmemx_space_calloc(shmemx_space_t space, size_t count, size_t size)
void *shmemx_space_align(shmemx_space_t space, size_t alignment, size_t size)

  • Examples to use the memory space APIs can be found at the built-in test suite:
    tests/space.c
    tests/space_int_amo.c
    tests/space_int_put.c
    tests/space_ctx_int_put.c

  • Enable MPI dynamic window based optimization. See configure option
    --enable-win-type=dynamic_win. Recommended to use with MPICH/OFI version
    3.4b1 or newer.

  • Allow --enable-fast=ipo to force inline performance critical routines.

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