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OMP_PROC_BIND – Whether theads may be moved between CPUsSpecifies whether threads may be moved between processors. If set to
TRUE, OpenMP theads should not be moved; if set to FALSE
they may be moved. Alternatively, a comma separated list with the
values MASTER, CLOSE and SPREAD can be used to specify
the thread affinity policy for the corresponding nesting level. With
MASTER the worker threads are in the same place partition as the
master thread. With CLOSE those are kept close to the master thread
in contiguous place partitions. And with SPREAD a sparse distribution
across the place partitions is used.
When undefined, OMP_PROC_BIND defaults to TRUE when
OMP_PLACES or GOMP_CPU_AFFINITY is set and FALSE otherwise.
OpenMP specification v4.5, Section 4.4