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Case running extremely slow on cluster in parallel mode |
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November 10, 2021, 03:34 |
Case running extremely slow on cluster in parallel mode
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#1 |
Member
Venkat Ganesh
Join Date: May 2020
Location: Cincinnati, Ohio
Posts: 49
Rep Power: 5 |
Hello,
This is my first time running openFoam on a cluster and I noticed that my simulation was running much slower on the cluster using multiple processors than on my local PC. I did a scaling analysis by noting down the execution time for around 50 iterations and averaged them (for different processor counts). I noticed that the performance sharply deteriorates after just increasing the processor count to 4. I've attached a photo of the timings and efficiency. For comparison, the execution time is less than a second on my local PC while using 8 cores. A single node on the cluster has 40 processors, and I'd like to make use of the available computing power to speed up my simulation. I'm using scotch method of decomposition and a custom solver based on interFoam. I'm also attaching the case setup. Please let me know what I could change to improve the performance. |
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November 10, 2021, 04:03 |
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#2 | |
Senior Member
Santiago Lopez Castano
Join Date: Nov 2012
Posts: 354
Rep Power: 15 |
Quote:
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November 15, 2021, 10:56 |
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#3 | |
Member
Venkat Ganesh
Join Date: May 2020
Location: Cincinnati, Ohio
Posts: 49
Rep Power: 5 |
Quote:
I ran all three options for 24 hours and the completed runtimes for the case were 2.5s on single node (40 processors), 2s on 80 processors and 1.9s on 120 processors. While the performance of single node is good enough for my case currently, I'm genuinely curious about the results.
Last edited by Venky_94; November 19, 2021 at 23:30. |
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Tags |
cluster, parallel |
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