[petsc-users] Scaling problem when cores > 600

[TAY wee-beng]

Hi,

I have a CFD code which uses PETSc and HYPRE. I found that for a certain 
case with grid size of 192,570,048, I encounter scaling problem when my 
cores > 600. At 600 cores, the code took 10min for 100 time steps. At 
960, 1440 and 2880 cores, it still takes around 10min. At 360 cores, it 
took 15min.

So how can I find the bottleneck? Any recommended steps?

I must also mention that I partition my grid only in the x and y 
direction. There is no partitioning in the z direction due to limited 
code development. I wonder if there is a strong effect in this case.

-- 
Thank you very much

Yours sincerely,

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TAY Wee-Beng 郑伟明 (Zheng Weiming)
Personal research webpage: http://tayweebeng.wixsite.com/website
Youtube research showcase: https://www.youtube.com/channel/UC72ZHtvQNMpNs2uRTSToiLA
linkedin: www.linkedin.com/in/tay-weebeng
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