mirror of
https://github.com/OpenMathLib/OpenBLAS
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39 lines
1.7 KiB
Markdown
39 lines
1.7 KiB
Markdown
OpenBLAS checks the following environment variables on startup:
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* `OPENBLAS_NUM_THREADS`: the number of threads to use (for non-OpenMP builds
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of OpenBLAS)
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* `OMP_NUM_THREADS`: the number of threads to use (for OpenMP builds - note
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that setting this may also affect any other OpenMP code)
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* `OPENBLAS_DEFAULT_NUM_THREADS`: the number of threads to use, irrespective if
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OpenBLAS was built for OpenMP or pthreads
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* `OPENBLAS_MAIN_FREE=1`: this can be used to disable automatic assignment of
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cpu affinity in OpenBLAS builds that have it enabled by default
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* `OPENBLAS_THREAD_TIMEOUT`: this can be used to define the length of time
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that idle threads should wait before exiting
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* `OMP_ADAPTIVE=1`: this can be used in OpenMP builds to actually remove any
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surplus threads when the number of threads is decreased
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`DYNAMIC_ARCH` builds also accept the following:
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* `OPENBLAS_VERBOSE`:
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- set this to `1` to enable a warning when there is no exact match for the
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detected cpu in the library
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- set this to `2` to make OpenBLAS print the name of the cpu target it
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autodetected
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* `OPENBLAS_CORETYPE`: set this to one of the supported target names to
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override autodetection, e.g., `OPENBLAS_CORETYPE=HASWELL`
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* `OPENBLAS_L2_SIZE`: set this to override the autodetected size of the L2
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cache where it is not reported correctly (in virtual environments)
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Deprecated variables still recognized for compatibilty:
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* `GOTO_NUM_THREADS`: equivalent to `OPENBLAS_NUM_THREADS`
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* `GOTOBLAS_MAIN_FREE`: equivalent to `OPENBLAS_MAIN_FREE`
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* `OPENBLAS_BLOCK_FACTOR`: this applies a scale factor to the GEMM "P"
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parameter of the block matrix code, see file `driver/others/parameter.c`
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