[mpich-discuss] mpirun on 1500~2000 cores

[Rajeev Thakur]

That is good to know. Thanks.

Rajeev
 

> -----Original Message-----
> From: mpich-discuss-bounces at mcs.anl.gov 
> [mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of dvg
> Sent: Sunday, July 05, 2009 5:21 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: Re: [mpich-discuss] mpirun on 1500~2000 cores
> 
> > significantly improves the time taken by MPI_Init
> 
> Much better, 40x improvement, from 20 minutes into ~30 seconds.
> (I tried mpich2-trunk-r4899.tar.gz)
> 
> Thanks,
> Dmitry.
> 
> 
> On Sun, 2009-07-05 at 00:24 -0400, Rajeev Thakur wrote: 
> > There was a fix applied recently that significantly 
> improves the time 
> > taken by MPI_Init on large numbers of processes when using 
> the Nemesis 
> > communication channel and the MPD process manager (both are 
> the default options). The fix will be included in the 1.1.1 
> release due out late next week.
> > 
> > In the meanwhile, please try out one of the nightly 
> snapshots of the 
> > svn source from 
> www.mcs.anl.gov/mpich2/downloads/tarballs/nightly/trunk/ and 
> let us know if it improves the time taken to start your job.
> > 
> > Thanks,
> > Rajeev
> > 
> > 
> >  
> > 
> > > -----Original Message-----
> > > From: mpich-discuss-bounces at mcs.anl.gov 
> > > [mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of dvg
> > > Sent: Saturday, July 04, 2009 10:04 PM
> > > To: mpich-discuss at mcs.anl.gov
> > > Subject: [mpich-discuss] mpirun on 1500~2000 cores
> > > 
> > > Hello,
> > > 
> > > What would be considered as reasonable time for mpirun to start a 
> > > job on 1500~2000 cores, 1 gige cluster?
> > > 
> > > Are there any kernel (linux) or eth-related parameters 
> which can be 
> > > tuned to speed it up?  MPICH2 libraries were compiled 
> with most/all 
> > > optimization options enabled.
> > > 
> > > Thank you,
> > > Dmitry
> > > 
> > > 
> > 
> > 
> 
>