FLUENT 6.3.xx hangs when trying to use more than 4 processors on a multi-processor system
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By default, FLUENT is using the SSM channel for MPICH2. SSM stands for Combined Socket and Shared memory Communication. Normally, this channel gives good performance if the computation is on a cluster composed of dual-processor and/or dual-core machines. However, if the user runs a FLUENT job on a big Shared Memory machine, for example, 8-cores, the performance of SSM has not been optimized for this purpose. Resolution: Users may try the shared memory channel by setting the following environment variable before launching FLUENT: MPICH2_CHANNEL=shm Setting the MPICH2_CHANNEL Variable 1.Open up Control Panel, System, Advanced, Environment Variables. 2.Under User Variables or System Variables, click the New button. 3.In the Variable text box type: MPICH2_CHANNEL 4.In the Value text box type: shm 5.Click OK. If this is set properly you should see the following printout in the FLUENT console User defined: MPICH2_CHANNEL=shm |
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