Hello, On Wed, Aug 31, 2016 at 05:52:48PM -0700, Lachlan Musicman wrote: > I don't believe it's 100% necessary to use OverSubscribe Yes. > > We have > > select/cons_res and CR_CPU, on nodes that look like > > NodeName=stpr-res-compute[01-02] CPUs=40 RealMemory=385000 Sockets=2 > CoresPerSocket=10 ThreadsPerCore=2 State=UNKNOWN OK, I will keep this in mind.
> > The CPUs aren't shared, but there's 40 of them per node, so that doesn't > really matter so much. I do not understand this. What part of a node is shared if not its processing resource ? Or may be there is a misunderstanding because my question was not well formulated. So I will rephrase it: What we are interested in is a situation where of 40 CPUs to one user 10 are allocated and the remaining 30 to for example one other user. So no actual oversubscription of CPUs but a sharing of the nodes CPUs between different users which get their exclusive cpusets. It has 40 CPUs as GRES and up to 40 can be allocated as exlusive resources to different users. I think cgroups would provide the necessary controls for this. Now, the point we are not sure about is what happens if a user allocates 10 out of 40 and sets "--exclusive" (if possible). Is the usage of that user (job) actually computed with 40 CPUs as most people would expect ? As described before other systems appear to bill only 10 while 40 are in fact used up. > > Also, have you found this page? http://slurm.schedmd.com/mc_support.html That is certainly a very useful resource explaining the different concepts and how they relate to the terminology used by slurm. However, skimming through it there does not appear to be a direct connection to out usage computation question. Best Regards Christof > > I only found last week, but made things a lot clearer in my head. > > > Cheers > L. -- Dr. rer. nat. Christof Köhler email: [email protected] Universitaet Bremen/ BCCMS phone: +49-(0)421-218-62334 Am Fallturm 1/ TAB/ Raum 3.12 fax: +49-(0)421-218-62770 28359 Bremen PGP: http://www.bccms.uni-bremen.de/cms/people/c_koehler/
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