[GE users] process to core distribution

Reuti reuti at staff.uni-marburg.de
Fri Oct 17 14:37:06 BST 2008

Am 17.10.2008 um 12:48 schrieb Joseph Hargitai:

> Running parallel jobs:
> with openmpi the distribution of processes on 16 core nodes are  
> even when using a pe that allows 8 or 4 cores only. Meaning you get  
> 2 processes on each of the cores.

Can you explain this in more detail? I don't get it.

> with mvapich1x we get a fillup - first 8 cores populate. 2 other  
> cpus idle.
> Noted that in mvapich2 there is a method to distribute to specific  
> cores.
> What role if any is SGE playing in how processes are mapped to cores?

Nothing for now. But maybe in a future SGE release.

You have to implement it on your own using "numactl", "taskset" or  
alike and keep track which cores are already in use.


-- Reuti

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