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Forum: OpenFOAM Running, Solving & CFD

January 22, 2009, 05:42

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,251

Posted By andreas_haakansson

Great, hope you are right, the

Great, hope you are right, then I have hopes to fix this!
My submitt script is:
http://www.cfd-online.com/OpenFOAM_Discus/icons/attachment_icon.gif bench2.scr...

Forum: OpenFOAM Running, Solving & CFD

January 22, 2009, 05:06

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,251

Posted By andreas_haakansson

Hi again, @Carsten: I thin

Hi again,

@Carsten: I think I understand now what you mean. In each tabel I have standardized the simulation time to that of 1 CPU or comparison, clock time is posted in order to compare to...

Forum: OpenFOAM Running, Solving & CFD

January 21, 2009, 10:21

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,251

Posted By andreas_haakansson

@Martin: Thanks for the info.

@Martin:
Thanks for the info. I will continue to check out what I can do about the MPI and latency.

@Carsten:
Sorry, maybe my table was not very clear. What I did was to run each case for...

Forum: OpenFOAM Running, Solving & CFD

January 20, 2009, 08:25

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,251

Posted By andreas_haakansson

Thanks for your answers, I wil

Thanks for your answers, I will check this with the latency.
Martin: Yes the cluster consists of 200 AMD Opteron 148 single-cpu nodes. I will report on any progress.

Regards
Andreas

Forum: OpenFOAM Running, Solving & CFD

January 20, 2009, 05:53

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,251

Posted By andreas_haakansson

I have now done some asking ar

I have now done some asking around at the cluster support. The network uses Gigabit Ethernet (1000Base-T) with a theoretical speed of 1000Mbit/s which according to support should imply that it...

Forum: OpenFOAM Running, Solving & CFD

January 19, 2009, 11:32

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,251

Posted By andreas_haakansson

Martin: I have now tried expan

Martin: I have now tried expanding the case from its original 12 000 cells to about 300 000 cells. I have run this in 2h on 1, 2 and 4 CPU's to see what happens.
My results are then:
1 CPU...

Forum: OpenFOAM Running, Solving & CFD

January 19, 2009, 05:13

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,251

Posted By andreas_haakansson

Thanks for the reply, I will t

Thanks for the reply, I will try increasing the size of the case and report what happens.

/Andreas

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