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Showing results 1 to 7 of 7 Search took 0.00 seconds. Search: Posts Made By: henry

Forum: OpenFOAM Running, Solving & CFD August 30, 2005, 14:38

Replies: 16 Parallel performance Views: 1,953 Posted By henry Each node calculates it's own Each node calculates it's own CPU time but only the master write to the log via the Info statement. If you want to see the CPU time for all the nodes replace Info with Sout or Serr. Only a...

Forum: OpenFOAM Running, Solving & CFD August 25, 2005, 09:08

Replies: 16 Parallel performance Views: 1,953 Posted By henry I would expect dual-core CPUs I would expect dual-core CPUs to suffer from the same problem because they share the same memory bus.

Forum: OpenFOAM Running, Solving & CFD August 24, 2005, 16:03

Replies: 16 Parallel performance Views: 1,953 Posted By henry Current CPU performance far ou Current CPU performance far outstrips memory access performance and it doesn't look like this situation will improve anytime soon which means that all codes that rely on rapid memory access of large...

Forum: OpenFOAM Running, Solving & CFD August 24, 2005, 15:47

Replies: 16 Parallel performance Views: 1,953 Posted By henry Recent multi-CPU motherboards Recent multi-CPU motherboards like the Tyan dual and quad Opteron boards (and I am guessing the recent Xeon boards as well) have a separate memory bus for each CPU. The AMD-based boards have...

Forum: OpenFOAM Running, Solving & CFD August 22, 2005, 15:44

Replies: 16 Parallel performance Views: 1,953 Posted By henry I assume from your results tha I assume from your results that the two CPUs are sharing the memory bus in each of your nodes and you are only getting 60% efficiency because the memory bus is saturated. Try running the case...

Forum: OpenFOAM Running, Solving & CFD August 22, 2005, 14:14

Replies: 16 Parallel performance Views: 1,953 Posted By henry and the speed of the interconn and the speed of the interconnect?

Forum: OpenFOAM Running, Solving & CFD August 22, 2005, 13:54

Replies: 16 Parallel performance Views: 1,953 Posted By henry It depends on the speed of the It depends on the speed of the interconnect, the size of the case and the parallel comms settings you have specified in .OpenFoam-1.1/controlDict.

Showing results 1 to 7 of 7

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