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Forum: OpenFOAM Running, Solving & CFD

January 20, 2009, 11:27

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,263

Posted By aunola

Having thought a bit about it,

Having thought a bit about it, the fact that you see no difference using floatTransfer might indicate that this is not a bandwidth problem; rather it might indeed be a latency problem. You might want...

Forum: OpenFOAM Running, Solving & CFD

January 20, 2009, 06:17

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,263

Posted By aunola

Can this be all latency induce

Can this be all latency induced? It appears that for N>1 CPUs, each executes for about the time one would expect but sits doing nothing for (N-1)/N of the total wall clock time.

As I understand...

Forum: OpenFOAM Running, Solving & CFD

January 19, 2009, 05:01

Replies: 20

Problem with parallelization speedup using many CPUbs

Views: 4,263

Posted By aunola

It seems you have a bandwidth

It seems you have a bandwidth problem on your interconnect. One possible explanation is that your case is too small for an efficient parallel run using more than 2 CPU's. Small cases require low...

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