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Re:Intel's “cripple AMD” function (2019) by celrod on Saturday August 29, 2020 @02:12PM (#24318171)
Hmm.

FWIW, on my [Skylake/Cascadelake]-X Intel systems, Intel's compilers performed well, almost always outperforming GCC and Clang. But on Zen, their performance was terrible. So I was happy to see that MKL, unlike the compilers, did not appear to gimp AMD.

It's disappointing that MKL doesn't use optimized code paths on the 3700X.

I messaged the person who actually ran the benchmarks and owns the laptop, asking them to chime in with more information. I'm just the person who wrote that benchmark suite.

Re:Intel's “cripple AMD” function (2019) by danieldk on Sunday August 30, 2020 @02:43PM (#24324916)
It seems I have found the issue. We were both right. MKL now uses a Zen-optimized kernel for dgemm, but not (yet?) for sgemm. More details:

https://github.com/pytorch/builder/issues/504