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Forum: OpenFOAM Running, Solving & CFD

September 15, 2008, 13:06

Replies: 8

Make mpirun use 4 out of 8 possible cpus

Views: 2,944

Posted By fra76

Ok, I understand. You want to

Ok, I understand.
You want to run 8 processes (with mpirun -np 8) but limit these processes to use only 4 cores of your machine, right?
This moves the issue from openfoam to the operating system....

Forum: OpenFOAM Running, Solving & CFD

September 15, 2008, 08:28

Replies: 8

Make mpirun use 4 out of 8 possible cpus

Views: 2,944

Posted By fra76

Christian, if you decompose o

Christian,
if you decompose on "n" processors, you must run on "n" processors. How can you solve your problem ignoring half of it?
About load unbalancing, my opinion is that the best option is to...

Forum: OpenFOAM Running, Solving & CFD

September 12, 2008, 13:54

Replies: 8

Make mpirun use 4 out of 8 possible cpus

Views: 2,944

Posted By fra76

You must simply decompose on 4

You must simply decompose on 4 subdomains and run on 4 processors, no matter how many cores you have in your machine.

Hope this helps,
Francesco

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