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| author | Tobias Burnus <tobias@codesourcery.com> | 2023-07-26 16:22:35 +0200 |
|---|---|---|
| committer | Tobias Burnus <tobias@codesourcery.com> | 2023-07-26 16:22:35 +0200 |
| commit | 25072a477a56a727b369bf9b20f4d18198ff5894 (patch) | |
| tree | 8dc40c0f128509b0e5c78ff32d5102c321bbaa4d /libgomp/libgomp.texi | |
| parent | c194a413369e9c9f92f1c9334556b359c7417742 (diff) | |
| download | gcc-25072a477a56a727b369bf9b20f4d18198ff5894.zip gcc-25072a477a56a727b369bf9b20f4d18198ff5894.tar.gz gcc-25072a477a56a727b369bf9b20f4d18198ff5894.tar.bz2 | |
OpenMP: Call cuMemcpy2D/cuMemcpy3D for nvptx for omp_target_memcpy_rect
When copying a 2D or 3D rectangular memmory block, the performance is
better when using CUDA's cuMemcpy2D/cuMemcpy3D instead of copying the
data one by one. That's what this commit does.
Additionally, it permits device-to-device copies, if neccessary using a
temporary variable on the host.
include/ChangeLog:
* cuda/cuda.h (CUlimit): Add CUDA_ERROR_NOT_INITIALIZED,
CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_INVALID_HANDLE.
(CUarray, CUmemorytype, CUDA_MEMCPY2D, CUDA_MEMCPY3D,
CUDA_MEMCPY3D_PEER): New typdefs.
(cuMemcpy2D, cuMemcpy2DAsync, cuMemcpy2DUnaligned,
cuMemcpy3D, cuMemcpy3DAsync, cuMemcpy3DPeer,
cuMemcpy3DPeerAsync): New prototypes.
libgomp/ChangeLog:
* libgomp-plugin.h (GOMP_OFFLOAD_memcpy2d,
GOMP_OFFLOAD_memcpy3d): New prototypes.
* libgomp.h (struct gomp_device_descr): Add memcpy2d_func
and memcpy3d_func.
* libgomp.texi (nvtpx): Document when cuMemcpy2D/cuMemcpy3D is used.
* oacc-host.c (memcpy2d_func, .memcpy3d_func): Init with NULL.
* plugin/cuda-lib.def (cuMemcpy2D, cuMemcpy2DUnaligned,
cuMemcpy3D): Invoke via CUDA_ONE_CALL.
* plugin/plugin-nvptx.c (GOMP_OFFLOAD_memcpy2d,
GOMP_OFFLOAD_memcpy3d): New.
* target.c (omp_target_memcpy_rect_worker):
(omp_target_memcpy_rect_check, omp_target_memcpy_rect_copy):
Permit all device-to-device copyies; invoke new plugins for
2D and 3D copying when available.
(gomp_load_plugin_for_device): DLSYM the new plugin functions.
* testsuite/libgomp.c/target-12.c: Fix dimension bug.
* testsuite/libgomp.fortran/target-12.f90: Likewise.
* testsuite/libgomp.fortran/target-memcpy-rect-1.f90: New test.
Diffstat (limited to 'libgomp/libgomp.texi')
| -rw-r--r-- | libgomp/libgomp.texi | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libgomp/libgomp.texi b/libgomp/libgomp.texi index 4ac01e9..073c181 100644 --- a/libgomp/libgomp.texi +++ b/libgomp/libgomp.texi @@ -5060,6 +5060,11 @@ The implementation remark: list of available devices (``host fallback''). @item The default per-warp stack size is 128 kiB; see also @code{-msoft-stack} in the GCC manual. +@item The OpenMP routines @code{omp_target_memcpy_rect} and + @code{omp_target_memcpy_rect_async} and the @code{target update} + directive for non-contiguous list items will use the 2D and 3D + memory-copy functions of the CUDA library. Higher dimensions will + call those functions in a loop and are therefore supported. @end itemize |