[mvapich-discuss] Help with polled desc error

[Shao-Ching Huang]

Hi

No failure was found in these mpiGraph runs. It's just that there is
significant variation among the entries of the matrices, compared to
another IB cluster of ours.

http://reynolds.turb.ucla.edu/~schuang/mpiGraph/

Thanks.

Shao-Ching


On Fri, Feb 01, 2008 at 08:43:19PM -0500, wei huang wrote:
> Hi,
> 
> How often do you observe the failures when running the mpiGraph test? Do
> all the failure happen at startup, as your simple program?
> 
> 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 Fri, 1 Feb 2008, Shao-Ching Huang wrote:
> 
> >
> > Hi Wei,
> >
> > We cleaned up a few things and re-ran the mpiGraph tests. The updated
> > results are posted here:
> >
> > http://reynolds.turb.ucla.edu/~schuang/mpiGraph/mpiGraph-8a.out_html/index.html
> > http://reynolds.turb.ucla.edu/~schuang/mpiGraph/mpiGraph-9a.out_html/index.html
> >
> > Please ignore results in my previous email. Thank you.
> >
> > Regards,
> > Shao-Ching
> >
> >
> > On Thu, Jan 31, 2008 at 08:35:41PM -0800, Shao-Ching Huang wrote:
> > >
> > > 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.
> > > > > >
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> > > > >
> > > >
> > > >
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