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Limit initial OpenBLAS thread count #46844

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Merged
merged 2 commits into from
Nov 15, 2022
Merged

Limit initial OpenBLAS thread count #46844

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f66db7d
Limit initial OpenBLAS thread count
staticfloat Sep 20, 2022
e8dba44
Support older names
staticfloat Sep 20, 2022
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13 changes: 13 additions & 0 deletions stdlib/OpenBLAS_jll/src/OpenBLAS_jll.jl
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Expand Up @@ -37,6 +37,19 @@ function __init__()
ENV["OPENBLAS_MAIN_FREE"] = "1"
end

# Ensure that OpenBLAS does not grab a huge amount of memory at first,
# since it instantly allocates scratch buffer space for the number of
# threads it thinks it needs to use.
# X-ref: https://github.com/xianyi/OpenBLAS/blob/c43ec53bdd00d9423fc609d7b7ecb35e7bf41b85/README.md#setting-the-number-of-threads-using-environment-variables
# X-ref: https://github.com/JuliaLang/julia/issues/45434
if !haskey(ENV, "OPENBLAS_NUM_THREADS") &&
!haskey(ENV, "GOTO_NUM_THREADS") &&
!haskey(ENV, "OMP_NUM_THREADS")
# We set this to `1` here, and then LinearAlgebra will update
# to the true value in its `__init__()` function.
ENV["OPENBLAS_NUM_THREADS"] = "1"
end

global libopenblas_handle = dlopen(libopenblas)
global libopenblas_path = dlpath(libopenblas_handle)
global artifact_dir = dirname(Sys.BINDIR)
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