[lug] Really off topic

Nate Duehr nate at natetech.com
Fri Feb 25 22:07:41 MST 2000


Nothing at all.  See the BogoMIPS-HOWTO.

It simply sets a timing loop in the kernel to match your processor.
It's not meant as a comparison number.

On Fri, Feb 25, 2000 at 12:09:57PM -0700, Leo Lue wrote:
> I've also found that the AMD chip runs slower than the Intel chip.
> 
> I have been running molecular dynamics simulations at work and at home.
> My machine at work is a dual Intel Pentium II 400MHz chip with 256MB
> RAM, while my machine at home is a 450MHz AMD-K6 with 125MB RAM.
> 
> Both machines are running RedHat6.0, and I have compiled the simulation
> code using g77 on both machines (same optimization level).  However, the
> code runs about a factor of 3 slower on the AMD machine.
> 
> One thing that I have been wondering about is that there is no cache
> listing in the /proc/cpuinfo file on the AMD machine, while there is a
> listing for the Intel machine.  That makes me think that maybe I'm not
> exploiting the cache.
> 
> One side question that I have is that the bogomips on the AMD machine is
> listed at 900 while for the Intel machine it is only 400.  What does
> this imply in terms of computation speed?
> 
> Any ideas?
> 
> Thanks,
> 
> Leo
> 
> 
> 
> 
> > -----Original Message-----
> > From: lug-admin at lug.boulder.co.us
> [mailto:lug-admin at lug.boulder.co.us]On
> > Behalf Of Ferdinand P. Schmid
> > Sent: Friday, February 25, 2000 10:35 AM
> > To: lug at lug.boulder.co.us
> > Subject: Re: [lug] Really off topic
> >
> >
> > Wasn't there a time when AMD processors were slow with floating point
> > operations.  I seem to remember that maybe with the K6-3, but
> > definitely with
> > the Athelon they resolved this issue.  Intel CPU's have always been
> very
> > focused on floating point operations, which helps with FFT but
> > doesn't really
> > matter for everyday work in regular desktop apps.
> >
> > Ferdinand
> 
> 
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-- 
Nate Duehr <nate at natetech.com>

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