[gmx-users] Blue Gene/P

[Hannes Loeffler]

Ok, here just a few numbers.

System: 52.000 atoms, coarse-grained, 500.000 steps

BlueGene/P: 16(procs) x 4(threads) = 64 tasks (or whatever they are
called)
   8x4   7.25 h 
  16x4  11    h
  32x4  > 12  h (queue only allows <= 12 h)

BlueGene/L:
  16x2  10 h
  64x2  > 12 h

Note: the procs x threads figures above are the numbers I asked for.  It
may be possible that the scheduler distributes in a different manner.  I
don't now.

That's all I have for the moment.


On Mon, 2008-03-31 at 17:29 -0700, Peter Tieleman wrote:
> Thanks. I've seen the BG/L argument, but BG/P processors are faster. I 
> have no idea how much though, and am looking for actual numbers or if 
> those are not available a guess based on actual BG/L numbers and some 
> argument about scaling to a BG/P.
>  
> Cheers,
> Peter
> 
> Mark Abraham wrote:
> > Peter Tieleman wrote:
> >> Hi,
> >>
> >> Has anyone run benchmarks on a BlueGene/P ?
> >
> > The word from IBM in December was that since GROMACS 3.x would lack 
> > both assembly inner-loops and threading on BlueGene/L, that it wasn't 
> > worthwhile running GROMACS on onw. I figure that goes for BlueGene/P too.
> >
> > Mark
> > _______________________________________________
> > gmx-users mailing list    gmx-users at gromacs.org
> > http://www.gromacs.org/mailman/listinfo/gmx-users
> > Please search the archive at http://www.gromacs.org/search before 
> > posting!
> > Please don't post (un)subscribe requests to the list. Use the www 
> > interface or send it to gmx-users-request at gromacs.org.
> > Can't post? Read http://www.gromacs.org/mailing_lists/users.php
> >
> >
> 
> _______________________________________________
> gmx-users mailing list    gmx-users at gromacs.org
> http://www.gromacs.org/mailman/listinfo/gmx-users
> Please search the archive at http://www.gromacs.org/search before posting!
> Please don't post (un)subscribe requests to the list. Use the 
> www interface or send it to gmx-users-request at gromacs.org.
> Can't post? Read http://www.gromacs.org/mailing_lists/users.php