poor performance with AMD Threadripper 3970x

[craldaz]

Hello, I have a AMD Threadripper 3970x. However, I am getting poor performance against other intel machines. About a 100x speed reduction at least.

I am using intel mkl compilers, do you know if AMD is being throttled by this? If so do you know of any hints for optimizing BAGEL on AMD?

[shiozaki]

That behavior sounds like you are having too many threads or something like that, meaning there is a issue in the run time environment. You could try 1 thread 1 MPI process first and see if that makes the situation better.

Are you using the MKL library (not the compiler)? If not, try to use it. The throttling should be a factor of 2-4 at the maximum. Alternatively, you may want to use something else, but in that case you may want to carefully compile it (for example, maybe it's better to compile it with -fopemp so that there is no interference between threading in bagel and threading in your blas library.