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Search: Posts Made By: henry
Forum: OpenFOAM Running, Solving & CFD July 19, 2005, 16:33
Replies: 20
Views: 2,955
Posted By henry
I would agree if the two proce

I would agree if the two processors were on a shared-memory or NUMA machine but they communicate across a GigaBit switch in which case I would estimate the speedup will be less than 90%.
Forum: OpenFOAM Running, Solving & CFD July 19, 2005, 12:13
Replies: 20
Views: 2,955
Posted By henry
I get a marked improvement whe

I get a marked improvement when using floatTransfer and I am surprised you don't. It appears your case is limited by the global-sums (i.e. latency) rather than bandwidth otherwise you would have...
Forum: OpenFOAM Running, Solving & CFD July 19, 2005, 06:48
Replies: 20
Views: 2,955
Posted By henry
I would expect better speed-up

I would expect better speed-up than that but because the case has two sets of cyclic planes you can end up with quite a large communications overhead if you split the domain between either pair. I...
Forum: OpenFOAM Running, Solving & CFD July 19, 2005, 06:26
Replies: 20
Views: 2,955
Posted By henry
Take a look at this tread:

Take a look at this tread:

http://www.cfd-online.com/OpenFOAM_Discus/messages/1/819.html

Also are your machines connected via a cross-over cable or a switch? If a switch is it a good one?
Forum: OpenFOAM Running, Solving & CFD July 19, 2005, 06:00
Replies: 20
Views: 2,955
Posted By henry
What values of the parallel ru

What values of the parallel running control parameters did you choose and what difference in performance did you get when you changed them?
Forum: OpenFOAM Running, Solving & CFD April 19, 2005, 06:28
Replies: 20
Views: 2,955
Posted By henry
With 170 iterations in the fir

With 170 iterations in the first corrector and 150 in the second it sounds like PISO is not converging very well which is probably due to your Courant number being quite high. Are these numbers from...
Forum: OpenFOAM Running, Solving & CFD April 19, 2005, 05:51
Replies: 20
Views: 2,955
Posted By henry
1) Yes the current implementa

1) Yes the current implementation of AMG has poor performance running in parallel but this can be improved by choosing a largish number of cells at the coarsest level and could be improved further...
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