Dear mailing list I’m running into trouble in the configuration of the small cluster I’m managing. I’ve installed openmpi-1.8.1 with gcc 4.7 on a Centos 6.5 with infiniband support. Compile and installation were all ok and i can compile and actually run parallel jobs, both directly or by submitting them with the queue manager (gridengine). My problem is that when two different subsets of two job end on the same node, they will not spread equally and use all the cores of the node but instead they will run on a common subset of cores leaving some other totally empty. For example two 4 core jobs on a 8 core node will result in only 4 core running on the node (all of them being oversubscribed) and the other 4 cores being empty. Clearly there must be an error in the way I’ve configured stuffs but i cannot find any hint on how to solve the problem. I’ve tried to do different map (map by core or by slot) but I’ve never succeeded. Could you give a me suggestion on this issue? Regards Antonio
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