AMD Athlon with Intel Fortran Compiler

Phillip Matz matz at wsunix.wsu.edu
Fri Jan 25 13:09:25 EST 2002


No prob, I was just curious.

Yes 3.3 is out (got my copy mid Dec.) and it supports a switch for
Athlon XP SSE.  I am not sure why one needs specify which architecture
one will be running the SSE compatible binaries on (it may very well
only be an aesthetic feature but still generates the same SSE code, I
don't know).  The association with Athlon XP for SSE compiling may have
more to do with the specific implementation of prefetch(via -tp athlonxp
-Mvect=prefetch) which the compiler needs to know in order to optimize
the SSE code, I can honestly say I have no real idea why just that they
are treated differently (Intel SSE vs. Athlon XP SSE) in the compiler
options for PGI 3.3.

Regards,

Phil


-----Original Message-----
From: beowulf-admin at beowulf.org [mailto:beowulf-admin at beowulf.org] On
Behalf Of Craig Tierney
Sent: Friday, January 25, 2002 9:34 AM
To: Phillip Matz
Cc: 'Eduardo Melione Abreu'; Beowulf at beowulf.org
Subject: Re: AMD Athlon with Intel Fortran Compiler


Sorry for skipping that info.  I did the tests a few months
ago and the compiler version was 3.2-4.   I did compile
with SSE.  It said there was SSE support (not for AMD explicitly). Was I
wrong?  Is 3.3 actually out?  When did it come out?

Sorry to misinform people as the version 3.3 may provide more
performance over the one I tested.

Craig


On Fri, Jan 25, 2002 at 09:26:06AM -0800, Phillip Matz wrote:
> The 10-30% improvement you observed, was that compared to SSE code 
> generated by the latest PGI compilers (Rev 3.3 with SSE for AMD) or an

> older PGI compiler that doesn't support SSE?
> 
> Regards,
> 
> Phil Matz
> 
> 
> -----Original Message-----
> From: beowulf-admin at beowulf.org [mailto:beowulf-admin at beowulf.org] On 
> Behalf Of Craig Tierney
> Sent: Friday, January 25, 2002 8:42 AM
> To: Eduardo Melione Abreu
> Cc: Beowulf at beowulf.org
> Subject: Re: AMD Athlon with Intel Fortran Compiler
> 
> 
> I ran the Intel Fortran Compiler on an dual 1.2 Ghz AMD system. I was 
> seen speed improvements of 10-30% over the Portland Group compiler on 
> 3 different fortran 77 codes. I was using the SSE instructions when 
> compiling.
> 
> The Intel compilers are fast, they are just a bit quirky sometimes. 
> They complain about Fortran 77 and Fortran 90 syntax unless you tell 
> it not too.  It didn't like some of the code and would complain with 
> internal compiler errors until I reorganized some code.  I never got 
> my Fortran 90 program to run with optmization.  I don't think it is 
> all F90 codes just mine had some syntax that it couldn't digest.
> 
> Craig
> 
> 
> > Hi,
> > 
> > Do anyone have yet installed and runned a Linux system with an AMD
> > Athlon processor and Intel Fortran Compiler (ifc)?
> > 
> > Thanks,
> > Melione.
> > 
> > 
> > _______________________________________________
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> 
> --
> Craig Tierney (ctierney at hpti.com)
> _______________________________________________
> Beowulf mailing list, Beowulf at beowulf.org
> To change your subscription (digest mode or unsubscribe) visit
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-- 
Craig Tierney (ctierney at hpti.com)
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