Run multiple cases simultaneously in parallel?
 

Hi FOAMers!

I have 16 cores available, and would like to run 4 different cases simultaneously, each on 4 cores. Is this possible? Is it as simple as simply running
or do I need to tell the system which 4 to use so that it's using all 16?

I guess you can. Just open four terminals run each case simultaneously.



Of course you have to partition the grids first for parallel processing.

So the computer is just smart enough to know not to reuse old cores?

I made a test and understood that my guess is wrong!

Well, just found the solution. An additional command "cpu-set" is needed:


mpirun -np 2 --cpu-set 0-3 pisoFoam -parallel (for assigning fist four cores)

mpirun -np 2 --cpu-set 4-7 pisoFoam -parallel (for assigning second four cores)
so on...

You can also use the "--bind-to socket" or "--bind-to core" option, it works fine!