OpenMP GPU porting. #191
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OpenMP GPU porting. #191
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This PR enables GPU offloading also via OpenMP.
Some notes:
It uses relatively recent features, such as the
loopclause. OpenMP and OpenACC directives share some similarities, so I vertically aligned whenver it made sense, to facilitate reading.OpenMP can be enabled with
GPU_BACKEND=OMPunderbuild.conf. OpenACC remains the default backend.Some features of OpenACC do not translate directly to OpenMP and thus are not supported (e.g., how asynchrony is handled).
Thread-level parallelization on GPUs has been removed from the code.
This porting was originally fully performed by Leon Oostrum (@loostrum) from the Netherlands eScience Center, under the ExaFLOW project. I re-worked it due to a large divergence of that development branch.