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Scaling issue while performing HPC simulation (transient multiphase CFD)

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Old   January 7, 2021, 10:09
Default Scaling issue while performing HPC simulation (transient multiphase CFD)
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Ali
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Hi,

I am running transient simulations on a supercomputer cluster. I submit a job description that acquires 32 nodes, each with 16 processors. However I recently noticed that the total wall-time of the job reflects only 1 node being utilised, which suggests that 31 nodes are not being used. I have been informed that this is an issue of "scalability" of my simulation. I would appreciate some guidance on how to maximise efficiency. I'm also unsure whether this is an issue that has to be fixed in the fluent case file, or that I need to adjust the PBS scripts.



Thanks,

Ali
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Old   January 18, 2021, 07:55
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Check fluent root path and parallel settings in launcher. Also may be a problem in cluster configuration.
Anyway I think this problem should be solved by technical support team of company who provided cluster to you.
In my case we have a cluster with 96 nodes and there is no scalability problems with ansys software and fluent in particular.
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