[mvapich-discuss] Help with polled desc error

[Shao-Ching Huang]

Hi Wei,

We did 2 runs of mpiGraph that you suggested on 48 nodes, with one (1)
MPI process per node:

mpiexec -np 48 ./mpiGraph 4096 10 10 >& mpiGraph.out

The results from the two runs are posted here:

http://reynolds.turb.ucla.edu/~schuang/mpiGraph/mpiGraph-1.out_html/
http://reynolds.turb.ucla.edu/~schuang/mpiGraph/mpiGraph-2.out_html/

During the tests, some other users are also running jobs on some of
these 48 nodes.

Could you please help us interpret these results, if possible?

Thank you.

Shao-Ching Huang


On Thu, Jan 31, 2008 at 01:05:06PM -0500, wei huang wrote:
> Hi Scott,
> 
> We went up to 256 processes (32 nodes) and did not see the problem in few
> hundred runs (cpi). Thus, to narrow down the problem, we want to make sure
> the fabrics and system setup are ok. To diagnose this, we suggest you
> running mpiGraph program from http://sourceforge.net/projects/mpigraph.
> This test stresses the interconnects. It should fail at a much higher
> frequency than simple cpi program if there is a problem with your system
> setup.
> 
> Thanks.
> 
> Regards,
> Wei Huang
> 
> 774 Dreese Lab, 2015 Neil Ave,
> Dept. of Computer Science and Engineering
> Ohio State University
> OH 43210
> Tel: (614)292-8501
> 
> 
> On Wed, 30 Jan 2008, Scott A. Friedman wrote:
> 
> > My co-worker passed this along...
> >
> > Yes, the error happens on the cpi.c program too.  It happened 2 times
> > among the 9 cases I ran.
> >
> > I was using 128 processes (on 32 4-core nodes).
> >
> > ---
> >
> > and another...
> >
> >    It happens for a simple MPI program which just does MPI_Init and
> > MPI_Finalize and print out number of processors.  It happened for
> > anything from 4 nodes (16 processors ) and more.
> >
> > What environment variables should we look for?
> >
> > Thanks,
> > Scott
> >
> > wei huang wrote:
> > > Hi Scott,
> > >
> > > On how many processes (and how many nodes) you ran your program? Do you
> > > have any environmental variables when you are running the program? Does
> > > the error happen on simple test like cpi?
> > >
> > > Thanks.
> > >
> > > Regards,
> > > Wei Huang
> > >
> > > 774 Dreese Lab, 2015 Neil Ave,
> > > Dept. of Computer Science and Engineering
> > > Ohio State University
> > > OH 43210
> > > Tel: (614)292-8501
> > >
> > >
> > > On Wed, 30 Jan 2008, Scott A. Friedman wrote:
> > >
> > >> The low level ibv tests work fine.
> > >
> > > _______________________________________________
> > > mvapich-discuss mailing list
> > > mvapich-discuss at cse.ohio-state.edu
> > > http://mail.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
> >
> 
> 
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