Hi, I am new to Julia Language and I am curious to use it for my work. Recently, I have tried to use it for some of my projects and observed some interesting cases.
First of all, when I start Julia REPL without adding any worker processes and do matrix multiplication. Julia takes all CPU cores in my computer to speed up the computation. I guess it used OpenBLAS. The code is X = randn(5000, 5000); Y = randn(5000, 5000); X * Y; However, after adding some worker processes by using *addprocs*(4) and do matrix multiplication. It runs the computation on only 1 CPU core and it slows down my performance. Even if I remove all worker processes that I add and run the multiplication again, it still uses one CPU core to do. The code is addprocs(4); X = randn(5000, 5000); Y = randn(5000, 5000); X * Y; rmprocs(2); rmprocs(3); rmprocs(4);rmprocs(5);X = randn(5000, 5000); Y = randn(5000, 5000); X * Y; My question here is that: Are there any ways to use all cores to do matrix multiplication ( and other matrix methods) with multiple cores after *addprocs*()? Thanks.
