For the use of fast networks: yes, fast networks improve the results, in particular for 9x9, in my humble opinion - however, you have already a good speed-up without that, in particular for 19x19, and in particular if you have multiple cores per node so that one core can take care of communications whereas the other nodes compute simulations.
But for grids (instead of clusters), the communication will become much much bigger - I'd like to study that carefully one day, I have no clear idea of what is possible. A trouble is that on grids (at least the ones I've seen) there are often faults. We'll have to be fault tolerant I guess. I point out that it has been said that very long delays between communications are not a trouble - this is not the case in my experiments, but perhaps this is implementation dependent, or perhaps I am wrong :-) Olivier
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