What do you guys thing about the P4

Nordwall, Douglas J Nordwall at pnl.gov
Thu Apr 12 08:54:01 PDT 2001


I'm fortunate enough to have Tim as an office mate and access to g98/p4 stats
run by a scientist here. Dave Feller, a scientist here, ran these, and he was
rather impressed. The sum of it was that he saw a linear increase in performance
with regard to processor speed, which impressed him because normally he doesn't
;)

I've attached the relevant data in html format (ok, yes, it was converted by
word, you have been warned).

I also have a nice graph that shows some comparisons of totals if you all are
interested.

> -----Original Message-----
> From: Phillip D. Matz [mailto:matz at wsunix.wsu.edu]
> Sent: Thursday, April 12, 2001 8:03 AM
> To: tim.carlson at pnl.gov; Robert G. Brown
> Cc: Eugene.Leitl at lrz.uni-muenchen.de; Scott Shealy; 
> beowulf at beowulf.org
> Subject: Re: What do you guys thing about the P4
> 
> 
> OK!  So when is someone with one of these P4 systems going to run G98
> comparison tests?  The Athlon is faster than a P3 for routine 
> G98 stuff (HF,
> DFT, MP2) but if we go by Tim's statement below then the P4 
> should blow away
> an Athlon.  After all, inverting matrices is essentially computational
> chemistry (loosely speaking of course) and I would really 
> really like to see
> those numbers in case it is true!
> 
> Respectfully,
> 
> Phillip Matz
> matz at wsunix.wsu.edu
> 
> ----- Original Message -----
> From: "Tim Carlson" <tim at pnl.gov>
> To: "Robert G. Brown" <rgb at phy.duke.edu>
> Cc: <Eugene.Leitl at lrz.uni-muenchen.de>; "Scott Shealy"
> <sshealy at asgnet.psc.sc.edu>; <beowulf at beowulf.org>
> Sent: Wednesday, April 04, 2001 2:19 PM
> Subject: Re: What do you guys thing about the P4
> 
> 
> > On Wed, 4 Apr 2001, Robert G. Brown wrote:
> >
> > > I have nothing for the P4, and at their current prices am 
> not likely to
> > > in the short run, although I confess that I'm a slut and 
> if somebody
> > > wanted to give me one I'd be more than happy to run it 
> through its paces
> > > and report on it.
> >
> > Well if all you are doing is inverting (big) matricies all 
> day long.. Then
> > you just have to buy a P4. :)
> >
> > Here is my favorite benchmark.. How fast can octave invert my random
> > 2000x2000 matrix. Non-blas plain vanilla octave. Same RPM on both
> > machines. Same kernel.
> >
> >
> > time octave < test.m
> >
> > ----test.m-----
> > inv(rand(2000));
> > quit
> > ----
> >
> > 1.5G P4 with 512 PC800 RDRAM
> >
> > real    1m11.479s
> >
> > vs. a dual P3/1G with 512M PC133 SDRAM
> >
> > real    4m13.391s
> >
> > I mean there is really no comparison. The P4 with a 50% 
> faster CPU beats
> > the PIII by a factor of almost 4. Pretty much in line with 
> the standard
> > stream numbers.
> >
> > Tim
> > ---
> > Tim Carlson
> > Voice: (509) 375-5978
> > Email: Tim.Carlson at pnl.gov
> >
> >
> >
> >
> >
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> 
> 
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