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Forum: OpenFOAM Running, Solving & CFD

June 14, 2007, 08:10

Replies: 13

OpenFOAM 13 Intel quadcore parallel results

Views: 5,161

Posted By nikos

Hi following this discussion

Hi
following this discussion I ve done some test
on a small 2d case 100000 cells using openmpi

first, compiling OF1.4 with -march=nocoma on EMT64 processor will reduce global cpu time by...

Forum: OpenFOAM Running, Solving & CFD

June 8, 2007, 04:43

Replies: 13

OpenFOAM 13 Intel quadcore parallel results

Views: 5,161

Posted By nikos

Ok I'm to busy to do some test

Ok I'm to busy to do some test on our cluster and unfortunately to come to workshop ...

An interessant benchmark would be to pass from ethernet ... I mean using multiple ethernet on the same...

Forum: OpenFOAM Running, Solving & CFD

June 7, 2007, 10:45

Replies: 13

OpenFOAM 13 Intel quadcore parallel results

Views: 5,161

Posted By nikos

which communicator do you use

which communicator do you use ? if lam you can use rpi sysv module to use shared memory on the same node ... something like mpirun -ssi rpi sysv

even if application is different on large Oracle...

Forum: OpenFOAM Running, Solving & CFD

June 7, 2007, 05:14

Replies: 13

OpenFOAM 13 Intel quadcore parallel results

Views: 5,161

Posted By nikos

if I remember on smp computer

if I remember on smp computer kernel.shmmax (which can be tuned in /etc/sysctl.conf) value can affect performance of mpi communicator ... see lam/mpi user guide

a too high value can affect...

Forum: OpenFOAM Running, Solving & CFD

June 7, 2007, 04:12

Replies: 13

OpenFOAM 13 Intel quadcore parallel results

Views: 5,161

Posted By nikos

Did you make a test with a sma

Did you make a test with a smaller case such that in could be in the cache ?
is your kernel tuned ?

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