[lug] Really off topic

[Leo Lue]

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