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:
AMD-2.3GHz
INTEL-2.33GHz
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
here).
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,
Sangamesh
Conultant-HPC
On Mon, Sep 8, 2008 at 11:46 PM, Carsten Aulbert
<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> 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
fast,
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.
HTH
Carsten
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