Hello All, Since I hadn't gotten any response yet, I just wanted to reiterate my request for help if anyone has an idea.
Thanks, Robert On 01/05/2013 06:08 PM, Robert Jacobi wrote: > Hello, > > We have an issue on our cluster with the implementation of Preemption > using Maui. I have configured two queues and corresponding QOS levels > in maui.cfg, one preemptor, one premptee (we are running Maui version > 3.3): > > PREEMPTPOLICY SUSPEND > QOSWEIGHT 10 > QOSCFG[hi] PRIORITY=10000 QFLAGS=PREEMPTOR > QOSCFG[lo] PRIORITY=10 QFLAGS=PREEMPTEE > CLASSWEIGHT 10 > CLASSCFG[debug] QDEF=hi QLIST=debug > CLASSCFG[low-priority] QDEF=lo > > When we have a premptee job runnning and submit a preemptor job, the > preemptee job gets suspended just as it should, while the preemptor > job runs. If there is no other job in the queue, the suspended job > resumes execution afterwards and finishes properly. > The problem occurs if the preemptor needs less processors than the > preemptee, and there is another job in the queue that fits in the > resulting gap. For example, I submit a preemptee job on the two test > nodes we use. Then I submit a preemptor job that only needs one node. > Now, while the preemptor is running, one node is idle. If at this > point there are (other preemptee) jobs in the queue or submitted that > only need one node, than all these jobs will be executed before the > suspended job resumes, despite the suspended job waiting. This happens > even though they have lower priority (checked through diagnose -p) > tghan the suspended job and don't even fit into the backfill window > created by the preemptor job (i.e. have a greater wall time requirement). > > I have searched the archives of this list and read any related thread > I could find, and consequently tried ALL the following settings in > various combinatons (and restarted Maui after each change): > BACKFILLPOLICY: NONE, FIRSTFIT, BESTFIT > RESERVATIONPOLICY: CURRENTHIGHEST, HIGHEST, NEVER > RESERVATIONDEPTH: 0, 1, 3 > > I do absolutely not understand how Maui can overlook the suspended job > and execute a lower priority job in the same QOS from the queue, even > if backfilling and reservations are disabled. > > I'd appreciate any suggestions why this happens and how to mend it. > Robert > -- Robert Jacobi Research Assistant University of Arizona Department of Aerospace& Mechanical Engineering 1130 N. Mountain Ave. Tucson, AZ, 85721-0119 tel: +1 (520) 621 4369 mail: rjac...@email.arizona.edu The less time you spent on algebra in life, the more time you have to be a happy person. (Kerschen) Doubt is not a pleasant condition, but certainty is absurd. (Voltaire) All great truths begin as blasphemies. (Shaw) Denken ist etwas, das auf Schwierigkeiten folgt und dem das Handeln vorausgeht.(Brecht) _______________________________________________ mauiusers mailing list mauiusers@supercluster.org http://www.supercluster.org/mailman/listinfo/mauiusers
