[MPICH] mpich and pbs

[Anthony Chan]

On Wed, 20 Jun 2007, Steve Young wrote:

> Yes. that is the only way you can run their version of it.
>
> % mpiexec -np 8 ./cpi
> mpiexec: Error: PBS_JOBID not set in environment.  Code must be run from
> a PBS script, perhaps interactively using "qsub -I".

The small cluster that I tested pbs/osc's mpiexec is down now,
so can't test various scenarios that may cause your problem.
Did you set up your PBS so that it allows 4 processes on each
node ?  I think it is called virtual cpu or something.
It appears each MPI process is NOT talking to each other...
You may also want to contact Pete Wyckoff on why this happens.

A.Chan

>
> >
> > On Wed, 20 Jun 2007, Steve Young wrote:
> >
> > > Ok I did the cpi test and had the following results:
> > >
> > > Process 0 of 1 is on node0038
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000107
> > > Process 0 of 1 is on node0038
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000101
> > > Process 0 of 1 is on node0038
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000118
> > > Process 0 of 1 is on node0038
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000107
> > > Process 0 of 1 is on node0037
> > > Process 0 of 1 is on node0037
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000108
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000126
> > > Process 0 of 1 is on node0037
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000102
> > > Process 0 of 1 is on node0037
> > > pi is approximately 3.1415926544231341, Error is 0.0000000008333410
> > > wall clock time = 0.000101
> > > mpiexec: Warning: tasks 0-7 exited before completing MPI startup.
> >
> > Did you run osc's mpiexec in a pbs script (which you qsub
> > the job to PBS) ?
> >
> > A.Chan
>
>