Do you have memory interleave turned on in the BIOS?  I don't know how 
much this app is moving stuff in and out of memory, but there's a good 
chance that if this is currently off, it would degrade performance.  It 
was not turned on by default on my Soyo Dragon+.

Jay


On Wednesday, October 30, 2002, at 10:07  PM, Phil Mendelsohn wrote:

> tclug-list-request at mn-linux.org writes:
>> Ok ... I have finally finished the simple comparison on different =
>> kernels and computational speed. I ran a commercial code that 
>> required memory (lots of matrix solutions) =
>> and large amounts of CPU times.  Recall that I previously posted the =
>> times, stating I was disappointed in the speedup from a PIII 700 MHz. 
>>  =
>> The results are listed below.  The AMD machine was dedicated to this =
>> problem - nothing else was running at the time. PIII 700 MHz (dual 
>> CPU - only 1 used for solution)        96,370 secs
>>    -  Win2000 AMD XP 2100+ (single CPU)  686 kernel (?)               
>>  65,039 secs
>> AMD XP 2100+ (single CPU) Athlon kernel                   63,411 secs
>>   -  Linux RH7.2 No real improvement in performance.  I must say I am 
>> disappointed in the =
>> speedup.
>
> Um, if you're crunching numbers, the kernel shouldn't be interacting 
> very much.  Where kernel comes in  is if you're losing speed to 
> time-sharing, process swap overhead, paging, or maybe I/O.  Seems to 
> me you wouldn't be hitting any of those things, so I guess I'm 
> surprised you're seeing as *much* as you did.  (Without knowing what 
> your algorithm or data set is... nothing better than being 
> unencumbered by facts!)
> --
> "To misattribute a quote is unforgivable." -- Anonymous 
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