[gmx-users] Re: IBM p-series performance

[David van der Spoel]

On Wed, 2004-10-20 at 14:34, Pim Schravendijk wrote:
> I had similar results. 
> 
> Searching on power4 in the user-list will show you some recent benchmarks: 
> 
> http://www.gromacs.org/pipermail/gmx-users/2004-September/012083.html
> 
> About the cause of this and any hope in getting a better performance (not 
> much chance though :( ), see:
don't keep your breath, but we're working on it really now...
> 
> http://www.gromacs.org/pipermail/gmx-users/2004-August/011655.html
> (a reaction on:
> http://www.gromacs.org/pipermail/gmx-users/2004-July/011643.html )
> 
> I guess that gromacs on the PowerPC 970 with altivec loops will really
> rock though, anybody tried already?
It seems to be fine. Check apple G5 benchmarks.
> 
> Greetings, Pim
> 
> --
> Pim Schravendijk - PhD Student
> Max Planck Institute for Polymer Research
> http://www.mpip-mainz.mpg.de/~schraven/
> 
> > 
> > Message: 1
> > Date: Wed, 20 Oct 2004 10:06:24 +0200
> > From: Stephan Frickenhaus <sfrickenhaus at awi-bremerhaven.de>
> > Subject: [gmx-users] IBM p-series performance
> > To: gmx-users at gromacs.org
> > Message-ID: <41761C80.8020600 at awi-bremerhaven.de>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> > 
> > Hello!
> > 
> > I tested gromacs 3.2.1 (single prec)  on ibm-p655 power4 (1.1GHz) 
> > (AIX5.1, xlc) systems on a single cpu.
> > My testcase (3D box-solvated enzyme) shows around 600MFlops/s, which 
> > appears low, compared to 1.85 GFlops on a Pentium4 prescott 
> > 3GHz/800MHzFSB/PC3200 RAM, Intel8-compiler).
> > 
> > Any suggestions how to optimize? Is it possible to use the new 
> > fma-version of fftw3.01?
> > 
> > Stephan
> > 
> > -- 
> >        Dr. Stephan Frickenhaus
> >   sfrickenhaus at awi-bremerhaven.de
> > Alfred-Wegener-Institute for Polar and Marine Research
> > Columbusstrae D-27568 Bremerhaven, Germany
> > 0471-4831-1179 (Di, Do)
> > 0421-218-4819 (Mo,Mi,Fr)
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-- 
David.
________________________________________________________________________
David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,  	75124 Uppsala, Sweden
phone:	46 18 471 4205		fax: 46 18 511 755
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://xray.bmc.uu.se/~spoel
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