[MITgcm-support] ifort optimization puzzle

Martin Losch mlosch at awi-bremerhaven.de
Tue Mar 8 08:38:04 EST 2005

Hi Ed,
this is my ifort

> csysl4::mlosch> ifort -V
> Intel(R) Fortran Compiler for 32-bit applications, Version 8.1    
> Build 20041118Z Package ID: l_fc_pc_8.1.023
> Copyright (C) 1985-2004 Intel Corporation.  All rights reserved.

So, unfortrunately, I have one even later than 8.1.021. I suspect that 
this is a compiler error, but I cannot see where this happens.

I had hoped that there are some know compiler option combinations that 
are known to be dangerous (appart from -O3),  that some of you would 

The next thing to check is probably what happens when I change the size 
of the problem (change nr or nx,ny). I ASSUME that the problem goes 
away, as soon as I have more than 1 horizontal point. It may also have 
to do with the overlap of (which is 2 > 1).


On Mar 8, 2005, at 2:24 PM, Ed Hill wrote:

> On Tue, 2005-03-08 at 12:30 +0100, Martin Losch wrote:
>> So MNC is off the hook (o:
> Hi Martin,
> Excellent!  ;-)
> Which version of ifort are you using?  I've read that there were a
> relatively large number of bugs in ifort v8.0 versus the more recent
> v8.1+ releases.  So I'd try an upgrade first.  It'd be a shame to do a
> bunch of careful testing only to (perhaps?) discover a compiler error
> fixed in the latest release.
> And if you want, I'll install v8.1.021 on the "authors" network for you
> today.
> Ed
> -- 
> Edward H. Hill III, PhD
> office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
>              Cambridge, MA 02139-4307
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