FLUENT V6 - Performance problems using 4 dual core Opteron processors: multiple parallel session using same processors / cores
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A 4-process parallel FLUENT session runs on a machine equipped with 4 dual-core opteron processors. A second session of the same kind is launched: It uses the same 4 processor cores, leaving the other 4 processor cores unused (idle). (This does not necessarily happen on all 8-cpu/core machines, but it has been observed on some.) In one of the session, type the following into the FLUENT text console window: (set-affinity "0 4 1 5 2 6 3 7") This will move the node processes 0--3 to the processor cores 3--7. The strings contains a sequence of pairs of numbers, each pair consisting of a process id and a cpu/core id. Process ids are 0, 1, 2,... for the node processes and 999999 for the host process. |
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