On Wed, Sep 17, 2008 at 11:12:41AM -0500, Michael Homa alleged: > In order to test, I wrote a simple hello_world program in C. When I submit > the program for execution, I see that the number of tasks is 6: > > Job ID Username Queue Jobname SessID NDS TSK Memory Time S Time > 317 mhoma dedicate hello_worl -- 1 6 --- 00:30 Q --
What did the job actually request? nodes=1:ppn=6? ncpus=6? Neither of those requests can be answered with quad-proc machines. > and the job remains queued because: > "job cannot run in partition DEFAULT (idle procs do not meet requirements > : 0 of 6 procs found)" The job is requesting resources that can't be met by your nodes. > The dedicated queue has three dual CPU, dual cores and was established in > torque: > > argo17-1 np=4 Linux2.i86pc dualcore amd smp dedicated > argo18-2 np=4 Linux2.i86pc dualcore amd smp dedicated > argo18-3 np=4 Linux2.i86pc dualcore amd smp dedicated I don't see nodes here that can satisfy the request of nodes=1:ppn=6. > According to the admin manual, "by default, a task maps directly to a > single processor within a job." > > A few questions: > > 1) What configuration variable controls this setting? In other words, > how does one change maui so that a single processor can handle > multiple tasks from the same job. By its very nature, a hello_world > stub should not require six processors. Of course, my job will > queue; it's asking for six processors and there are only four > available. But, I'm surprised that the message says "0 of 6 found". Don't change the number of CPUs in a task. Down that road lies madness. > 2) I'm unclear as to how the "task" number is derived? I noticed that > my hello_world has a PE of 6. Is that a coincidence or does the > resulting PE become the number of tasks? Why six processors for > hello_world? We would need to see that actual request. -- Garrick Staples, GNU/Linux HPCC SysAdmin University of Southern California Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html
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