PBS Scheduler
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Joseph Landman landman at scalableinformatics.comFri Sep 27 07:45:47 PDT 2002
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On Fri, 2002-09-27 at 07:27, Ivan Oleynik wrote: > Hi, > > I have a problem with PBS scheduler: every time when I run IO intensive > series of jobs it goes down. As a result, the whole pbs queue with other > jobs become suspended. > > I could not see any useful info in sched_logs and server_logs files except > of noninformative messages: > > 0001;PBS_Server;Svr;PBS_Server;Connection refused (111) in contact_sched,Could not contact Scheduler This is actually quite informative. What I have experienced in the past with PBS and heavy NFS loads is that the cluster head node runs out of tcp/udp slots as specified in the /etc/inetd.conf or /etc/xinetd.conf files. Depending upon which one you use, you will need to bump those limits up a bit. > For this particular test I run a bunch of mpich jobs requesting just 1 > processor per job, and the number of the submitted jobs was 6 times the > number of available nodes. Each job does intensive IO via NFS running over > Myrinet (writing files ~ 300 Mb each). [...] -- Joseph Landman, Ph.D Scalable Informatics LLC email: landman at scalableinformatics.com web: http://scalableinformatics.com phone: +1 734 612 4615
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