MKL apparently not loaded

[h-larsson]

I get the following error when trying to use MKL:

julia> using LinearAlgebra
julia> BLAS.get_config()
LinearAlgebra.BLAS.LBTConfig
Libraries: 
├ [ LP64] libblas.so
└ [ LP64] liblapack.so
julia> N = 100; A=rand(N,N); B = rand(N,N); C= A * B;
julia> using MKL
julia> BLAS.get_config()
LinearAlgebra.BLAS.LBTConfig
Libraries: 
└ [ILP64] libmkl_rt.so
julia> C= A * B;
Error: no BLAS/LAPACK library loaded!

BLAS.get_config().loaded_libs[1].libname does exist. I am using Julia 1.7.1 and MKL v0.4.4.

[ViralBShah]

Is this 32-bit linux? What architecture?

[h-larsson]

x86_64 GNU/Linux 5.15.18-1-lts

[giordano]

How did you install Julia?

[h-larsson]

I am using Arch Linux and installed it from their repositories (julia 2:1.7.1-6).

[giordano]

Don't use that package. Use aur:julia-bin instead, which simply ships the official binaries:

jjulia> using LinearAlgebra

julia> BLAS.get_config()
LinearAlgebra.BLAS.LBTConfig
Libraries: 
└ [ILP64] libopenblas64_.so

julia> N = 100; A=rand(N,N); B = rand(N,N); C_openblas= A * B;

julia> using MKL

julia> BLAS.get_config()
LinearAlgebra.BLAS.LBTConfig
Libraries: 
└ [ILP64] libmkl_rt.so

julia> C_mkl = A * B;

julia> C_mkl ≈ C_openblas
true

[h-larsson]

Thanks! It works. Sorry that it seems to have nothing to do with the MKL package.