[Zaphod-Users] Myri nodes

[John Dorelli]

Also note that the 128 proc limit is associated with the "long" queue. 
other queues have different proc limits (see the user wiki for
details).  On top of the queue limits, the scheduler is currently
configured such that a user cannot execute jobs on more than 82 procs at
a given time, though there are currently no limits on the number of jobs
a user can have in the queue.

John

On Sat, 2005-10-15 at 01:13, Kai Germaschewski wrote:
> On Fri, 14 Oct 2005, Fekete, Balazs M. wrote:
> 
> > What is the maximum myri nodes that could be requested? I managed to
> > compile and run the river model component of the GFDL Earth System
> > Model. When I tried to run it with the usual small number of CPUs I used
> > for my test runs, it worked. When I asked for 40 nodes and with 1
> > process on each, it failed to establish communications with some CPUs. I
> > noticed that the nodes assigned to my task seemed to be mixed (if the
> > node name reflect ethernet or myrinet communication). I also figured
> > that we had two CPUs on each node, so I should be running 20 nodes with
> > two processes on each, so I tried "nodes=20:ppn=2:myri" which hanged
> > forever. Perhaps, I should be patient, or simply there is no 20 nodes
> > with myrinet.
> 
> There's a limit of 64 nodes for a single job. Please use, as you suggested
> "ppn=2" instead of requesting just 1 process per node, because in that
> case the 2nd processor on all of the nodes your job runs goes unused.
> 
> Basically everything you did is fine, you just need patience because there 
> aren't enough (20) nodes available for your job at this time, so it'll 
> remained queued until its turn comes. "showq" or "qstat" show the 
> currently running and queued jobs.
> 
> --Kai
> 
> 
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-- 
Dr. John C. Dorelli
UNH-EOS Space Science Center
245E Morse Hall, 39 College Road
Durham, NH 03824-3525
Office:  (603)862-0613
Cell:  (240)418-2582
john.dorelli at unh.edu