Re: Itanium2@900MHz slower than alpha@666MHz ?

From: Stephane Eranian <eranian_at_hpl.hp.com>
Date: 2003-10-25 03:10:44
Ionut,

On Fri, Oct 24, 2003 at 06:26:55PM +0200, Ionut Georgescu wrote:
> Yes, it is a 1.5MB cache CPU.
> 
> But it might be more than just cache misses. When running with a 256x256
> grid, I am actually using 3 256x257 matrices, which is slightly over
> 1.5MB.  I just made a comparison with a 32x32 grid and the difference is
> the same: alpha 10.294s, zx2000 14.777s . -O3 is only by 0.4s faster
> than -O2 in this case.
> 
Another thing to check is the syslog. Check to see if your program 
is not getting "floating point software assist" fault. That can slow
you down significantly.

-- 
-Stephane
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Received on Fri Oct 24 13:16:08 2003

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