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Docs: OMP_NUM_THREADS also affects non-OpenMP builds #5529

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Docs: OMP_NUM_THREADS also affects non-OpenMP builds #5529

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5 changes: 3 additions & 2 deletions docs/runtime_variables.md
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Expand Up @@ -2,8 +2,9 @@ OpenBLAS checks the following environment variables on startup:

* `OPENBLAS_NUM_THREADS`: the number of threads to use (for non-OpenMP builds
of OpenBLAS)
* `OMP_NUM_THREADS`: the number of threads to use (for OpenMP builds - note
that setting this may also affect any other OpenMP code)
* `OMP_NUM_THREADS`: the number of threads to use (for OpenMP builds, and as a
fallback for pthreads builds - note that setting this may also affect any
other OpenMP code)
* `OPENBLAS_DEFAULT_NUM_THREADS`: the number of threads to use, irrespective if
OpenBLAS was built for OpenMP or pthreads

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