Environment Variables

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3 Environment Variables

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