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The environment variables which beginning with OMP_ are defined by
section 4 of the OpenMP specification in version 4.5, while those
beginning with GOMP_ are GNU extensions.
| • OMP_CANCELLATION: | Set whether cancellation is activated | |
| • OMP_DISPLAY_ENV: | Show OpenMP version and environment variables | |
| • OMP_DEFAULT_DEVICE: | Set the device used in target regions | |
| • OMP_DYNAMIC: | Dynamic adjustment of threads | |
| • OMP_MAX_ACTIVE_LEVELS: | Set the maximum number of nested parallel regions | |
| • OMP_MAX_TASK_PRIORITY: | Set the maximum task priority value | |
| • OMP_NESTED: | Nested parallel regions | |
| • OMP_NUM_THREADS: | Specifies the number of threads to use | |
| • OMP_PROC_BIND: | Whether theads may be moved between CPUs | |
| • OMP_PLACES: | Specifies on which CPUs the theads should be placed | |
| • OMP_STACKSIZE: | Set default thread stack size | |
| • OMP_SCHEDULE: | How threads are scheduled | |
| • OMP_THREAD_LIMIT: | Set the maximum number of threads | |
| • OMP_WAIT_POLICY: | How waiting threads are handled | |
| • GOMP_CPU_AFFINITY: | Bind threads to specific CPUs | |
| • GOMP_DEBUG: | Enable debugging output | |
| • GOMP_STACKSIZE: | Set default thread stack size | |
| • GOMP_SPINCOUNT: | Set the busy-wait spin count | |
| • GOMP_RTEMS_THREAD_POOLS: | Set the RTEMS specific thread pools |
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