Strange multithreaded behaviour on ARM Ampere A1 (Oracle Cloud)

[mkitti]

@Dandan

eigen

You might also want to look at BLAS.set_num_threads to set the number of threads that OpenBLAS is trying to uses:

Julia Threads vs BLAS threads

I am experimenting with Julia’s (experimental) multithreading feature recently and like the results so far. One of the problems I need to deal with, involves the multiplication of several pairs (say in the order 5 to 50) of matrices, whose size is average (say linear size in the order 10 - 1000). For that problem, there can be a competition between either using Julia threads (to loop over the different pairs) versus using multithreaded matrix multiplication provided by BLAS, and it will depend …