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| author | Thomas Schwinge <tschwinge@baylibre.com> | 2024-11-12 09:54:35 +0100 |
|---|---|---|
| committer | Thomas Schwinge <tschwinge@baylibre.com> | 2024-12-06 09:48:33 +0100 |
| commit | c80ecfa0927a1ada31864c709220a2adb7c96662 (patch) | |
| tree | d33c65415e7382282b1368ce2a768597b1badb12 | |
| parent | ab5bd6ac68c6d9f870fcaf0de4a73f3dec920db9 (diff) | |
| download | gcc-c80ecfa0927a1ada31864c709220a2adb7c96662.zip gcc-c80ecfa0927a1ada31864c709220a2adb7c96662.tar.gz gcc-c80ecfa0927a1ada31864c709220a2adb7c96662.tar.bz2 | |
Clarify libgomp nvptx 'omp_low_lat_mem_space' documentation
PTX '%dynamic_smem_size' was "Introduced in PTX ISA version 4.1", and
"Requires 'sm_20' or higher". Given that GCC/nvptx generally supports
'sm_20', only the PTX ISA version matters here, and that's all fine if
just using GCC's defaults. Follow-up to
commit e9a19ead498fcc89186b724c6e76854f7751a89b
"openmp, nvptx: low-lat memory access traits".
libgomp/
* libgomp.texi: Clarify nvptx 'omp_low_lat_mem_space'
documentation.
| -rw-r--r-- | libgomp/libgomp.texi | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libgomp/libgomp.texi b/libgomp/libgomp.texi index 453c356..6b8000c 100644 --- a/libgomp/libgomp.texi +++ b/libgomp/libgomp.texi @@ -6972,8 +6972,10 @@ The implementation remark: memory-copy functions of the CUDA library. Higher dimensions will call those functions in a loop and are therefore supported. @item Low-latency memory (@code{omp_low_lat_mem_space}) is supported when the - the @code{access} trait is set to @code{cgroup}, the ISA is at least - @code{sm_53}, and the PTX version is at least 4.1. The default pool size + the @code{access} trait is set to @code{cgroup}, and libgomp has + been built for PTX ISA version 4.1 or higher (such as in GCC's + default configuration). @c -mptx=4.1 + The default pool size is 8 kiB per team, but may be adjusted at runtime by setting environment variable @code{GOMP_NVPTX_LOWLAT_POOL=@var{bytes}}. The maximum value is limited by the available hardware, and care should be taken that the |