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msimberg
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Just a possible alternative idea
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Looks good to me, thanks @rasolca.
@albestro's also looks like a nice idea (https://github.com/eth-cscs/DLA-Future/pull/1354/changes#r2747356273), but I think it can be left like this as well.
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I've just seen that CI fails, and it might be worth to report that I'm facing runtime problems with this PR (on jureca). Not investigated yet.
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OPENMPI doesn't support GPU direct reduce operations.
Added a flag to force
reduceandallreduceto use CPU memory and adapted thempi_gpu_awarespack variant to allow full GPU aware communication or limited GPU aware communication.