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A comment on GEMM: From Pure C to SSE Optimized Micro Kernels (2014). Parent comment

Re:GEMM: From Pure C to SSE Optimized Micro Kernels (2014) by gnufx on Friday March 16, 2018 @08:52AM (#16600273)
[Not all the world is C++ -- I'm glad to say!]

Note that OpenBLAS doesn't have avx512 kernels, and the fallback to avx2 (unreleased) is a factor of three slower than MKL dgemm on Knights Landing. It looks as if the next release of BLIS will remedy the lack of free BLAS avx512 support with micro-architecture dynamic dispatch which includes fairly competitive avx512 (>80% of MKL dgemm on KNL).

I don't know about the competition on non-x86 architectures, but BLIS currently has more limited support than OpenBLAS.

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Re:GEMM: From Pure C to SSE Optimized Micro Kernels (2014) by stochastic_monk on Friday March 16, 2018 @11:51AM (#16601452)
Good to know! I wasn't aware. It doesn't matter too much for me, since the machines I'm using only support AVX2, but I do write my code to work generically on all vectorizations up to AVX512, and I'm likely to use MKL on Knights Landing+.
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