Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!swrinde!ucsd!ucbvax!VM.NRC.CA!WJP
From: WJP@VM.NRC.CA (Wayne Podaima)
Newsgroups: comp.sys.sgi
Subject: f77 performance under 3.3.1
Message-ID: <90Oct29.145239est.57616@ugw.utcs.utoronto.ca>
Date: 29 Oct 90 17:27:04 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: National Research Council, Computing Services, Ottawa CAN
Lines: 13


We have some unhappy observations re performance of Fortran programs under
IRIX 3.3.1.  The same program compiled under 3.3.1 runs about 5% slower
than it did under 3.2.3 (same compiler options), using 1 cpu of a 4D/240S.
The program is compute intensive - no paging, no disk I/O, double precision.
Any ideas; anyone with similar results?

We then tried the libfpe.a floating point exception handling library,
expecting it to be still slower; well it ran 2% FASTER than the original
3.2.3 compiled version.  What gives?

Any comments appreciated,
  Wayne Podaima