Hello, I believe Robbert Eggermont answered my question. But thank you again anyway !
Cheers Christof On Thu, Sep 01, 2016 at 04:43:25PM -0700, Lachlan Musicman wrote: > On 1 September 2016 at 18:16, Christof Koehler < > christof.koeh...@bccms.uni-bremen.de> wrote: > > > 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. > > > > > > Ok, I can't speak to GRES or cgroups - we have a simple set up. In *my* > explanation, a "node" is a "motherboard". IE, each motherboard has 40 cpus, > and those cpus can be shared as you would like them to be (10 to one user, > 30 to the other; or even 1 to 40 users, or 4 to 10 users). > > > > > > > > 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. > > > > > > Cheers > L. > > ------ > The most dangerous phrase in the language is, "We've always done it this > way." > > - Grace Hopper -- Dr. rer. nat. Christof Köhler email: c.koeh...@bccms.uni-bremen.de 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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