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Set OPENBLAS_NUM_THREADS=1 on local Distributed workers #47803

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Merged
merged 1 commit into from
Dec 5, 2022
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Set OPENBLAS_NUM_THREADS=1 on local Distributed workers #47803

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7 changes: 7 additions & 0 deletions stdlib/Distributed/src/managers.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -487,6 +487,13 @@ function launch(manager::LocalManager, params::Dict, launched::Array, c::Conditi
if get(env, "JULIA_DEPOT_PATH", nothing) === nothing
env["JULIA_DEPOT_PATH"] = join(DEPOT_PATH, pathsep)
end

# If we haven't explicitly asked for threaded BLAS, prevent OpenBLAS from starting
# up with multiple threads, thereby sucking up a bunch of wasted memory on Windows.
if !params[:enable_threaded_blas] &&
get(env, "OPENBLAS_NUM_THREADS", nothing) === nothing
env["OPENBLAS_NUM_THREADS"] = "1"
end
# Set the active project on workers using JULIA_PROJECT.
# Users can opt-out of this by (i) passing `env = ...` or (ii) passing
# `--project=...` as `exeflags` to addprocs(...).
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