Comments (3)
imaginary-person
commented on May 24, 2024
It doesn't result in a speedup, as memcpy is memory-bound.
Test Size(B) Avg.Time(us)
gdr_copy_to_mapping 1 0.2038
gdr_copy_to_mapping 2 0.1940
gdr_copy_to_mapping 4 0.1860
gdr_copy_to_mapping 8 0.1865
DBG: using AVX2 implementation of gdr_copy_to_bar
gdr_copy_to_mapping 16 0.1960
gdr_copy_to_mapping 32 0.1928
gdr_copy_to_mapping 64 0.1901
gdr_copy_to_mapping 128 0.1869
gdr_copy_to_mapping 256 0.1926
gdr_copy_to_mapping 512 0.2109
gdr_copy_to_mapping 1024 0.2547
gdr_copy_to_mapping 2048 0.3260
gdr_copy_to_mapping 4096 0.4883
gdr_copy_to_mapping 8192 0.8617
gdr_copy_to_mapping 16384 1.6531
gdr_copy_to_mapping 32768 3.2493
gdr_copy_to_mapping 65536 6.4663
gdr_copy_to_mapping 131072 12.8850
gdr_copy_to_mapping 262144 25.7638
gdr_copy_to_mapping 524288 51.4691
gdr_copy_to_mapping 1048576 102.8449
gdr_copy_to_mapping 2097152 206.1706
gdr_copy_to_mapping 4194304 413.7580
gdr_copy_to_mapping 8388608 828.0581
gdr_copy_to_mapping 16777216 1676.4880
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imaginary-person
commented on May 24, 2024
BTW, for testing AVX2 or AVX512 support, __cpuid_count should be used instead of __get_cpuid.
has_avx2 seems to be incorrectly computed in the source-code, and is 0 even when it should be 1.
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hongbilu
commented on May 24, 2024
It doesn't result in a speedup, as
memcpyis memory-bound.Test Size(B) Avg.Time(us) gdr_copy_to_mapping 1 0.2038 gdr_copy_to_mapping 2 0.1940 gdr_copy_to_mapping 4 0.1860 gdr_copy_to_mapping 8 0.1865 DBG: using AVX2 implementation of gdr_copy_to_bar gdr_copy_to_mapping 16 0.1960 gdr_copy_to_mapping 32 0.1928 gdr_copy_to_mapping 64 0.1901 gdr_copy_to_mapping 128 0.1869 gdr_copy_to_mapping 256 0.1926 gdr_copy_to_mapping 512 0.2109 gdr_copy_to_mapping 1024 0.2547 gdr_copy_to_mapping 2048 0.3260 gdr_copy_to_mapping 4096 0.4883 gdr_copy_to_mapping 8192 0.8617 gdr_copy_to_mapping 16384 1.6531 gdr_copy_to_mapping 32768 3.2493 gdr_copy_to_mapping 65536 6.4663 gdr_copy_to_mapping 131072 12.8850 gdr_copy_to_mapping 262144 25.7638 gdr_copy_to_mapping 524288 51.4691 gdr_copy_to_mapping 1048576 102.8449 gdr_copy_to_mapping 2097152 206.1706 gdr_copy_to_mapping 4194304 413.7580 gdr_copy_to_mapping 8388608 828.0581 gdr_copy_to_mapping 16777216 1676.4880
May I ask what do you do for AVX2 optimization compared to AVX?
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