Path: utzoo!utgpu!news-server.csri.toronto.edu!csri.toronto.edu!corkum
Newsgroups: comp.sys.sgi
From: corkum@csri.toronto.edu (Brent Thomas Corkum)
Subject: Still looking for the SPARK in my SPARC!!!
Message-ID: <1991Feb22.113611.14143@jarvis.csri.toronto.edu>
Organization: Civil Engineering, University of Toronto
Date: 22 Feb 91 16:36:11 GMT
Lines: 35

This is a followup from my previous posting. First of all I'd like to
thank all you people who responded with suggestions. Most people
recognized that I didn't use the optimizer, so I tried it on both the
Iris and the Sun. I was very pleasantly surprised on the Iris as it
sped up my code by 25%, as for the Sun, no SPARK yet.

The following are a set of results for the C test benchmark found on
boulder.civ.toronto.edu (128.100.14.11) in pub/COMPUTE/compute.tar.
The Sun Compiler was the default bsd compiler that came with the SPARCstation 2.

machine                 compile line                           cpu time (sec)

IRIS 4D/25 16MB       cc -O2 -float *.c -lm -o compute               10.5 
SUN Sparc2 16MB       cc *.c -lm -o compute                          73.0
SUN Sparc2 16MB       cc -O2 *.c -lm -o compute                      49.2
SUN Sparc2 16MB       cc -O2 -fsingle *.c -lm -o compute             34.7
SUN Sparc2 16MB       cc -O3 -fsingle *.c -lm -o compute             37.0
SUN Sparc2 16MB       cc -O4 -fsingle *.c -lm -o compute             37.0
SUN Sparc2 16MB       cc -O2 -fsingle -dalign -Bstatic *.c -lm -o compute  34.8


As you can see, I can't get any better than a third of the IRIS speed. I
also tried the inline library in /usr/lib/libm.il, with the best time
being 32.3 sec for -O2 -fsingle directives. So I'm still looking for that
SPARK. If anyone can verify my results or try the C1.0 or C1.1 or gnu compiler
on my test program it would be much appreciated.

For those who are interested you can get my code via anonymous ftp from the
above location, there's a README file in a compute.tar file 
(extract using tar xvof compute.tar).

Thanks,

Brent
corkum@boulder.civ.toronto.edu


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