On Wed, 17 Sep 2008, Garrick Staples wrote:
> 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.
Hi Garrick:
I didn't have a "-l nodes" option in the script:
#PBS -N hello_world
#PBS -q dedicated
/home/homes51/mhoma/a.out
and did not specify a -l on qsub (qsub script). When I add the -l option:
#PBS -N hello_world
#PBS -q dedicated
#PBS -l nodes=1:ppn=1
/home/homes51/mhoma/a.out
I get the same result:
checking job 322
State: Idle
Creds: user:mhoma group:users class:dedicated qos:DEFAULT
WallTime: 00:00:00 of 00:30:00
SubmitTime: Wed Sep 17 14:45:29
(Time Queued Total: 00:01:41 Eligible: 00:01:41)
Total Tasks: 1
Req[0] TaskCount: 1 Partition: ALL
Network: [NONE] Memory >= 0 Disk >= 0 Swap >= 0
Opsys: [NONE] Arch: [NONE] Features: [dedicated]
Dedicated Resources Per Task: PROCS: 6 <----------- I find this interesting
but where is it
getting it.
...
PE: 6.00 StartPriority: 1
job cannot run in partition DEFAULT (idle procs do not meet requirements :
0 of 6 procs found)
idle procs: 28 feasible procs: 0
The only place I figure it may come from is the torque configuration
for the dedicated queue:
resources_max.ncpus = 6
But my understand from reading the queue configuration guide (and feel
free to tell me I'm full of crap) is that resources_max.ncpus is the
maximum number of processors a single job can request in the queue and not
the default number of processors allocated per job if the user does not
include "-l node" argument.
> > 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've always wanted to ask this question. Does the np refer to "real,
physical processors" or does it refer to the total number of cores?
If the former, then argo17-1 should be:
argo17-1 np=2:ppn=2 Linux2.i86pc dualcore amd smp dedicated
If the latter, then:
argo17-1 np=4 Linux2.i86pc dualcore amd smp dedicated
is correct
>
> Don't change the number of CPUs in a task. Down that road lies madness.
ok. Technically "done that road lies more 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.
I'm not being funny but how does one get the request. From the checkjob
command?
Michael
And, I don't want to forget to say, thank you for your help.
_______________________________________________
mauiusers mailing list
[email protected]
http://www.supercluster.org/mailman/listinfo/mauiusers
