Dear Steven and other meep users, I have a problem with the parallelization of my simulations. We have a cluster with several nodes. Every node is connected with each other through a one Gbit Ethernet switch. Every node has two processors with two physical cores, i.e., four cores. I have found the efficiency of every cores is high (about 80%) when we parallelize only one node, i.e., four cores. However, the efficieny is low (about 50%) when we parallelize two nodes, i.e., eight cores. I don't know why the efficieny become low. Are there some problems with meep-mpi or the Ethernet swith? Thank you very much. Sincerely, Li
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