[Beowulf] Q: AMD Opteron (Barcelona) 2356 vs Intel Xeon 5460
kyron at neuralbs.com
Wed Sep 17 12:43:36 PDT 2008
Sangamesh B wrote:
> Hi Tim,
> Recently I benchmarked a Fortran based Scientific application on
> both Intel Xeon Quad core and AMD Opteron Quad core with RHEL 5.
> Following are the results:
> 1. Serial 147.719
> sec 73.952 sec
> 2. Parallel 4 core 39.798
> sec 32.317 sec
> 3. Parallel 8 core 26.880
> sec 30.371 sec
I'll go ahead and assume your "Fortran based Sci app" is memory bound
and this might be why the AMD based parallel version scales a little
better given it's using HT as communication fabric (non-shared MMU).
> For AMD, I used GCC compiler(gfortran), which is released by AMD
> for its barcelona-AMD fam10 based processors.
> For Intel, Intel 10 compilers.
Which compile flags were used? Also, note that I've had issues with icc
generating really fast but inaccurate code (fp model is not IEEE *by
default*, I am sure _everyone_ knows this and I am stating the obvious
The figures are interesting but you could get a tad higher in the
information by using the time utility ( the one from
http://www.gnu.org/directory/time.html ) with the -v option. This way we
can get a hint of cache use/misses and all sorts of generally neat stuff
(without getting into profiling).
> Thank you,
> On Mon, Sep 8, 2008 at 11:46 PM, Carsten Aulbert
> <carsten.aulbert at aei.mpg.de <mailto:carsten.aulbert at aei.mpg.de>> wrote:
> Hi Tim,
> Tim Chipman wrote:
> > Does anyone have any 'real world' experience with 'both' of
> these CPUs, in terms of relative performance for 'whatever work
> you do' ?
> > I realize the xeon is a faster mhz part (3.16ghz xeon vs 2.3ghz
> opteron) so I'm more concerned with "relative performance per mhz"
> > I'm involved with a cluster project, and we have 2 options from
> our vendor,
> > - 25 compute nodes, dual-quadcore intel 5460, or
> > - 32 compute nodes, dual-quadcore amd 2356
> >>From what I've been able to glean (Spec.org / SpecCPU 2006),
> > - the intel chips have better integer performance
> > - the amd chips have better FPU performance
> > so the likely anticipated real-world performance result .. will
> depend on how a given application blends / balances things.
> We have "only" the Quad-Xeon boxes with E5435 and these are quite
> indeed it seems that FFTW seems to run faster on Xeons but I have not
> made any benchmarks for the past ~ 9 months, so I don't know about the
> latest Opterons.
> I think you need to come up with a real world scenario of what will be
> run on the cluster and maybe compile a little benchmark yourself
> ans aks
> the vendor to run both (or get hands on on both boxes. I think that's
> the only "fair" comparison that's possible.
> Beowulf mailing list, Beowulf at beowulf.org <mailto:Beowulf at beowulf.org>
> To change your subscription (digest mode or unsubscribe) visit
> Beowulf mailing list, Beowulf at beowulf.org
> To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Beowulf