[Mauiusers] Questions regarding "tasks" and the cfg file.

Greenseid, Joseph M. Joseph.Greenseid at ngc.com
Wed Sep 17 10:35:29 MDT 2008


what batch queue are you using?  are the nodes showing up as available to your queue?  for example, if you're using torque, what is the output of the command `pbsnodes -a`?  
 
--Joe

________________________________

From: mauiusers-bounces at supercluster.org on behalf of Michael Homa
Sent: Wed 9/17/2008 12:12 PM
To: mauiusers at supercluster.org
Subject: [Mauiusers] Questions regarding "tasks" and the cfg file.



Hello:

I'm doing the initial configuration for maui (maui-3.2.6p20) on a
university-based cluster. I've configured a very basic configuration file
which I've hacked to death trying to solve this issue. Two key lines:

NODECFG[argo17-1] MAXJOB=10
CLASSCFG[dedicated] MAXPROC=12

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 --

and the job remains queued because:
 "job cannot run in partition DEFAULT (idle procs do not meet requirements
: 0 of 6 procs found)"

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

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".

   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?

I'm new to Maui so if I'm asking dumb questions, chalk it up to being an
idiot.

Michael Homa
Operating Systems Support and Database Group
Academic Computing and Communication Center
University of Illinois at Chicago
email:  mhoma at uic.edu
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