Same case can run with 4 processors but failed with 8 processors

System Modules TOMAWAC
1

Hello [name removed],

I am testing on a [name removed] case that works with 4 processors,in the 2nd picture, but not with 8 processors, as shown in the 1st picture.

Does anyone encountered this problem and is there any solution?

Many thanks!

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2

The 1st picture did not show in the previous post, so I put it in this reply :laughing:

1.png
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3

Hello,

I guess you do not have enought points to parallelize that much, I think that with 300 points, you don’t have to parallelize at all, I guess you do not gain anything, communication between processors makes the gain null when there are so few points per processor.

Probably that the streamline has so few points that the communication between processors is too tricky.

regards.

4

Hello,

Thank you for the advice and it seems that indeed it is the problem that you mentioned. I refined the mesh and the log shows NUMBER OF ELEMENTS: 3833

and NUMBER OF POINTS: 2013, after splitting into 8 parts. Though still it did not work with 8 cores, the calculation could run with 6 cores, which would not work previously.

regard,