Subject: Re: FPU Performance on DECstation 5000/125
To: Karl Maftoum <email@example.com>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
Date: 08/27/1997 04:17:34
On Wed, 27 Aug 1997 20:58:12 +1000 (EST),
Karl Maftoum <firstname.lastname@example.org> wrote:
>Hmm, this is important because the machines are being used for a
>distributed computing experiment (using pvm) to solve mathematical
>models, so the FPU sorta has to work properly! I'll investigate the
>kernel code. BTW there is a BIG difference .. about 6 times on a float
>multiply, how good is the maths library?
There is a simple test you could try:
1. Compile and link a simple FP_intensive program under Ultrix.
(hopeful y a small-memory, FP-intensive FP benchmark.)
2. Time the program under Ultrix (preferably on an
3. Time the same program running on NetBSD
(i.e,. running the Ultrix binary usign Ultrix emulation).
4. Compare results of 2 and 3....
That will determine if it's a library problem or a kernel