OMP_TARGET_OFFLOAD – Controls offloading behaviour

Description:

Specifies the behaviour with regard to offloading code to a device. This variable can be set to one of three values - MANDATORY, DISABLED or DEFAULT.

If set to MANDATORY, the program will terminate with an error if the offload device is not present or is not supported. If set to DISABLED, then offloading is disabled and all code will run on the host. If set to DEFAULT, the program will try offloading to the device first, then fall back to running code on the host if it cannot.

If undefined, then the program will behave as if DEFAULT was set.

Reference:

OpenMP specification v5.0, Section 6.17