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The OMP_NESTED environment variable enables or disables nested parallelism unless nested parallelism is enabled or disabled by calling the omp_set_nested library routine. If set to TRUE, nested parallelism is enabled; if it is set to FALSE, nested parallelism is disabled. The default value is FALSE.
Example:
setenv OMP_NESTED TRUE
Cross Reference:
omp_set_nestedfunction, see Section 3.1.9 on page 40.