OMP_DEFAULT_DEVICE – Set the device used in target regions ¶Set to choose the device which is used in a target region, unless the
value is overridden by omp_set_default_device or by a device
clause. The value shall be the nonnegative device number. If no device with
the given device number exists, the code is executed on the host. If unset,
device number 0 will be used.
omp_get_default_device – Get the default device for target regions, omp_set_default_device – Set the default device for target regions,
OpenMP specification v4.5, Section 4.13