Martin Kroeker
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docs/runtime_variables.md
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| OpenBLAS checks the following environment variables on startup: | OpenBLAS checks the following environment variables on startup: | ||||
| * **OPENBLAS_NUM_THREADS=** the number of threads to use (for non OpenMP-builds of OpenBLAS) | |||||
| * **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 - 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 | * **OPENBLAS_DEFAULT_NUM_THREADS=** the number of threads to use, irrespective if OpenBLAS was built for OpenMP or pthreads | ||||
| * **OPENBLAS_MAIN_FREE=1**" this can be used to disable automatic assignment of cpu affinity in OpenBLAS builds that have it enabled by default | * **OPENBLAS_MAIN_FREE=1**" this can be used to disable automatic assignment of cpu affinity in OpenBLAS builds that have it enabled by default | ||||
| * **OPENBLAS_THREAD_TIMEOUT=** this can be used to define the length of time that idle threads should wait before exiting | * **OPENBLAS_THREAD_TIMEOUT=** this can be used to define the length of time that idle threads should wait before exiting | ||||
| * **OMP_ADAPTIVE=1** this can be used in OpenMP builds to actually remove any surplus threads when the number of threads is decreased | * **OMP_ADAPTIVE=1** this can be used in OpenMP builds to actually remove any surplus threads when the number of threads is decreased | ||||
| * | |||||
| DYNAMIC_ARCH builds also accept the following: | DYNAMIC_ARCH builds also accept the following: | ||||
| * **OPENBLAS_VERBOSE=** set this to "1" to enable a warning when there is no exact match for the detected cpu in the library | * **OPENBLAS_VERBOSE=** set this to "1" to enable a warning when there is no exact match for the detected cpu in the library | ||||
| * set this to "2" to make OpenBLAS print the name of the cpu target it autodetected | |||||
| set this to "2" to make OpenBLAS print the name of the cpu target it autodetected | |||||
| * **OPENBLAS_CORETYPE=** set this to one of the supported target names to override autodetection, e.g. OPENBLAS_CORETYPE=HASWELL | * **OPENBLAS_CORETYPE=** set this to one of the supported target names to override autodetection, e.g. OPENBLAS_CORETYPE=HASWELL | ||||
| * **OPENBLAS_L2_SIZE=** set this to override the autodetected size of the L2 cache where it is not reported correctly (in virtual environments) | |||||