BLAS vs Threads on a cluster

General Usage Performance
3

Thanks! A simple test shows that you are right:

using LinearAlgebra

A = rand(800,800)

@time Threads.@threads for i in 1:30
    eigen(A)
end

BLAS.set_num_threads(1)
@time Threads.@threads for i in 1:30
    eigen(A)
end

output:

 12.973553 seconds (31.24 k allocations: 613.706 MiB, 0.16% gc time, 3.23% compilation time)
  5.900912 seconds (22.85 k allocations: 613.151 MiB, 0.23% gc time, 9.74% compilation time)
1 Like