beepy0
commented
5 years ago - From https://lemire.me/blog/2018/04/19/by-how-much-does-avx-512-slow-down-your-cpu-a-first-experiment/ "Hello, I did a few vector AVX512 benchmarks. They are mostly arithmetic vector operations. I found that the peak of floating point multiplications is doubled from AVX2 (I configured bios for not throttling down). That’s the case when the vectors with samples are smaller than the cache pages, otherwise there is memory bottleneck. So, both AVX512 and AVX2 have same flops. I guess for intensive computations which require little memory and lots of operations AVX512 provides a better performance. Also, I’ve seen that different intel architectures have different performance in shuffling operations which are a really big bottleneck. In any case, benchmarking instructions sets is pretty complex and highly application dependant."