OSchip
/
OpenBLAS
Not watched
1
0
Fork 0
Code
Releases 66 Wiki evaluate Activity
Issues 0 Pull Requests 0 Datasets Model Cloudbrain HPC
You can not select more than 25 topics Topics must start with a chinese character,a letter or number, can include dashes ('-') and can be up to 35 characters long.
Tree: b6c906f805
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'b6c906f805'
${ noResults }
OpenBLAS/docs/runtime_variables.md

1.8 kB
Raw Blame History

Runtime variables

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)

  • 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_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

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
    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_L2_SIZE= set this to override the autodetected size of the L2 cache where it is not reported correctly (in virtual environments)

Deprecated variables still recognized for compatibilty:

  • GOTO_NUM_THREADS= equivalent to OPENBLAS_NUM_THREADS
  • GOTOBLAS_MAIN_FREE equivalent to OPENBLAS_MAIN_FREE
  • OPENBLAS_BLOCK_FACTOR this applies a scale factor to the GEMM "P" parameter of the block matrix code, see file driver/others/parameter.cen