[GE users] Large openmpi jobs hang when launched through SGE on 130 hosts or more

fredlefebvre frederick.lefebvre at clumeq.ca
Fri Apr 30 14:54:18 BST 2010

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Setting 'plm_rsh_num_concurrent' worked.  Thank's to all of you!

Frederick Lefebvre

On Fri, Apr 30, 2010 at 8:59 AM, andy <andy.schwierskott at sun.com> wrote:
> Hi,
> did you run into an openMPI/sun HPC Cluster Tools related limit:
> % ompi_info -all | grep plm_rsh_num_concurrent
>  MCA plm: parameter "plm_rsh_num_concurrent" (current value: "128", data source: default value)
> does this work:
>   mpirun -mca plm_rsh_num_concurrent 256 -np 2000
> Regards,
> Andy
> On Fri, 30 Apr 2010, fredlefebvre wrote:
>> Hi All,
>> I'm not sure if this is an SGE or OpenMPI issue but the fact is it
>> works fine when I tested it outside of SGE... so here it is.
>> We use SGE 6.2u3 on a cluster of 960 8 core nodes interconnected with
>> QDR infiniband.  We run mostly mpi jobs with openmpi.  Most of our
>> users use less than 250 cores at a time and it works fine for them.
>> But larger users have reported that their mpi applications hang at
>> start time from time to time.
>> I first though the problem was related to their use of a larger number
>> of 'cores'...  But it turns out it is directly linked to the number of
>> 'nodes/hosts' used by an application.  Basically, if a program runs on
>> 129 hosts or less, it works as expected but if it runs on 130 hosts or
>> more, it hangs at startup.  That could be a 1040 slot job on 130 hosts
>> at 8 cores per host or a 130 slot job at 1 core per host.  I
>> understand that 'hang' may be a bit vague.  Both 'qstat' and 'qhost'
>> report processes on all requested hosts but 'ps' fails to show
>> anything more than the 'qrsh' and 'orted' processes (as well as the
>> mpirun on the master node) so it appears the error occurs before the
>> program gets a chance to run.. The same jobs work when launched
>> manually with mpirun and a hostfile.
>> As anyone observe that issue before? Any hints?
>> Thank's
>> Frederick Lefebvre
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