BLISBLAS.jl is a Julia package that allows users to use the BLIS library for Julia's underlying BLAS. Note that BLIS only provides BLAS but not LAPACK (OpenBLAS will still be used for LAPACK functionality).
This package is based on libblastrampoline, which enables picking a BLAS (and/or LAPACK) library at runtime, and thus requires Julia 1.7+.
] add BLISBLAS
Simply using BLISBLAS is enough to switch to BLIS for BLAS operations.
julia> using LinearAlgebra
julia> BLAS.get_config()
LinearAlgebra.BLAS.LBTConfig
Libraries:
└ [ILP64] libopenblas64_.so
julia> using BLISBLAS
julia> BLAS.get_config()
LinearAlgebra.BLAS.LBTConfig
Libraries:
├ [ILP64] libopenblas64_.so
└ [ILP64] libblis.soNote that the BLISBLAS package has to be loaded in every new Julia process. Upon quitting and restarting, Julia will start with the default OpenBLAS.
The following simple example is run with OPENBLAS_NUM_THREADS=64 and BLIS_NUM_THREADS=64 on a 64-core AMD EPYC 7763 (Milan) CPU.
julia> using BenchmarkTools
julia> A = rand(1000,1000); B = rand(1000,1000);
julia> @btime $A * $B;
3.927 ms (2 allocations: 7.63 MiB)
julia> using BLISBLAS
julia> @btime $A * $B;
2.729 ms (2 allocations: 7.63 MiB)