[Issues] some CPUs are not used

John P. McFarland mcfarland at astro.rug.nl
Wed Sep 26 17:09:01 CEST 2007

Hi Johannes,

The DPU/CPU behavior might have something to do with the cluster queueing 
system not controlled by the DPU, but that is only a guess.  For now, you 
could simply try to optimize the lists you use both CPUs on one node and no 
others if possible.

I'm CCing this to the Issues list so that anybody else with some ideas 
(especially our DPU experts) can chime in.



On Mon, 24 Sep 2007, Johannes Koppenhoefer wrote:

> Hello John,
> I have realized, that if you submit a job on the dpu with the 
> red_filenames option, and the number of files is e.g. 20 it results in 3 
> CPU jobs, two on one node and on on the next node. Now, for some reason I 
> do not understand, the second CPU on the second node is not going to be 
> used by other processes. This is in particular painful in my situation 
> where I have to submit jobs that run on a single CPU, because I can use 
> only half of the CPUs on our cluster and the rest is blocked. Is there any 
> reason for this dpu-behavior? Do you know of any quick workaround for me?
> Cheers,
> Johannes

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