From MKL back to OpenBLAS

General Usage Performance
9

The following seems to work, for switching at run-time in Julia 1.7.
No need to restart.

julia> using LinearAlgebra

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

julia> using MKL

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

julia> LinearAlgebra.__init__()

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

julia> MKL.__init__()
4770

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

Credits to @giordano (though he also warned this might not be proper way to switch).

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