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3.8 OMP_NUM_THREADS – Specifies the number of threads to use

Description:
Specifies the default number of threads to use in parallel regions. The value of this variable shall be a comma-separated list of positive integers; the value specified the number of threads to use for the corresponding nested level. If undefined one thread per CPU is used.
See also:
omp_set_num_threads
Reference:
OpenMP specification v4.5, Section 4.2