Scaling issue while performing HPC simulation (transient multiphase CFD)

am6e18 · January 7, 2021, 11:09

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

sfn · January 18, 2021, 08:55

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.

January 7, 2021, 11:09	Scaling issue while performing HPC simulation (transient multiphase CFD)	#1
am6e18 New Member Ali Join Date: Jan 2020 Posts: 2 Rep Power: 0	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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January 18, 2021, 08:55		#2
sfn New Member Alexander Join Date: Dec 2016 Posts: 24 Rep Power: 9	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.