In fact there should be a problem with Maui's node allocation setting. I
have checked the $PBS_NODEFILE contents (this is also may be seen with
"qstat -n1"): while the default Torque scheduler correctly allocates one
slot on node1 and another slot on node2, in case of Maui I always see that
Maui allocates two slots on one of the nodes. Will now try to check better
the maui.cfg file. Apparently my allocation policy is not correct. Will now
dig it further..
2017-08-09 21:49 GMT+02:00 r...@open-mpi.org <r...@open-mpi.org>:
> sounds to me like your maui scheduler didn’t provide any allocated slots
> on the nodes - did you check $PBS_NODEFILE?
> > On Aug 9, 2017, at 12:41 PM, A M <amm.p...@gmail.com> wrote:
> > Hello,
> > I have just ran into a strange issue with "mpirun". Here is what
> > I successfully installed Torque 220.127.116.11 with the plain pbs_sched on a
> minimal set of 2 IB nodes. Then I added openmpi 2.1.1 compiled with verbs
> and tm, and have verified that mpirun works as it should with a small
> "pingpong" program.
> > Here is my Torque minimal jobscript which I used to check the IB message
> > #!/bin/sh
> > #PBS -o Out
> > #PBS -e Err
> > #PBS -l nodes=2:ppn=1
> > cd $PBS_O_WORKDIR
> > mpirun -np 2 -pernode ./pingpong 4000000
> > The job correctly used IB as the default message passing iface and
> resulted in 3.6 Gb/sec "pingpong" bandwidth which is correct in my case,
> since the two batch nodes have the QDR HCAs.
> > I have then stopped "pbs_sched" and started the Maui 3.3.1 scheduler
> instead. Serial jobs work without any problem, but the same jobscript is
> now failing with the following message:
> > --------
> > Your job has requested more processes than the ppr for this topology can
> > App: /lustre/work/user/testus/pingpong
> > Number of procs: 2
> > PPR: 1:node
> > Please revise the conflict and try again.
> > --------
> > I then have tried to play with - -nooversubscribe and "--pernode 2"
> options, but the error persisted. It looks like the freshmost "mpirun" is
> getting some information from the latest available Maui scheduler. It is
> enough to go back to "pbs_sched", and everything works like a charm. I used
> the preexisting "maui.cfg" file which still works well on the oldish Centos
> 6 with an old 1.8.5 version of openmpi.
> > Thanks ahead for any hint/comment on how to address this. Are there any
> other mpirun options to try? Should I try to downgrade openmpi to the
> latest 1.X series?
> > Andy.
> > mpirun -np 2 -pernode --mca btl ^tcp ./pingpong 4000000
> > 2.
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