[Pw_forum] AMD64 and IFC

[breezejd at lsbu.ac.uk]

So althought ifc compiles 32-bit code and pgf compiles 64-bit code they
are still pretty similar in performace ??

Does anyone have data on how PWSCf performs ?? I won't know until a few
weeks time.

> On Fri, 30 Jan 2004, Paolo Giannozzi wrote:
>
>> I have heard that you can compile 32-bit executables with Intel
>> compilers, but it is not very fast,
>
> Take a look at AMD SPECfp2000 submissions for opterons - ifc
> and pgf submissions for the same system are within a few percent
> of each other - sometimes ifc wins; sometimes pgf wins. This is
> despite the fact that ifc does not know about AMD64 as such, and
> can use only half of the FP registers available to pgf.
>
> If you look at the individual tests for Opteron 148, for example,
> you'll see that ifc generates faster code for 6 of those (swim,
> art, equake, ammp, lucas, apsi), while pgf is faster for 8 (wupwise,
> mgrid, applu, mesa, galgel, facerec, fma3d, sixtrack) - but none
> of the wins are particularly dramatic.
>
> This also tallies pretty well with my experience - ifc 7.1 and
> pgf90 5.0-2 are about neck-to-neck on opterons.
>
>> and that the only compiler that compiles 64-bit code on AMD
>> is PGI.
>
> There is also Pathscale (http://www.pathscale.com/) - if you are
> one of the few lucky people on their beta-testing program.
>
> Serguei
>
> ---
> Dr. Serguei Patchkovskii
>
> Tel: +1-(613)-990-0945
> Fax: +1-(613)-947-2838
> E-mail: Serguei.Patchkovskii at nrc.ca
>
> Coordinator of Modelling Software
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