3 Environment Variables

The variables OMP_DYNAMIC, OMP_MAX_ACTIVE_LEVELS, OMP_NESTED, OMP_NUM_THREADS, OMP_SCHEDULE, OMP_STACKSIZE,OMP_THREAD_LIMIT and OMP_WAIT_POLICY are defined by section 4 of the OpenMP specifications in version 3.1, while GOMP_CPU_AFFINITY and GOMP_STACKSIZE are GNU extensions.

• OMP_DYNAMIC: Dynamic adjustment of threads
• OMP_MAX_ACTIVE_LEVELS: Set the maximum number of nested parallel regions
• OMP_NESTED: Nested parallel regions
• OMP_NUM_THREADS: Specifies the number of threads to use
• 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
• OMP_PROC_BIND: Whether theads may be moved between CPUs
• GOMP_CPU_AFFINITY: Bind threads to specific CPUs
• GOMP_STACKSIZE: Set default thread stack size