CPU PME with GPU update and DD not permitted
The code does not permit running PME with or without separate PME ranks with DD (with or without direct comm) and separate PME ranks. Our aim with the 2021 release was to relax as many restrictions as possible so this should be revised -- the code seems to be able to do at least everything offloaded except:
- PME on CPU without separate PME ranks
- PME on CPU without separate PME ranks and direct communication We should check also:
- PME on CPU with separate PME ranks
- PME on CPU with separate PME ranks and direct comm