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3.3 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.
See also:
omp_get_default_device, omp_set_default_device,
OpenMP specification v4.0, Section 4.11