This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
optimization problem with 3.2.1 Fortran
- From: Peter Morgan <pjm at survey dot ise dot canberra dot edu dot au>
- To: <gcc-bugs at gcc dot gnu dot org>
- Cc: <bug-gcc at gnu dot org>
- Date: Mon, 27 Jan 2003 14:33:17 +1100 (EST)
- Subject: optimization problem with 3.2.1 Fortran
Dear Colleagues.
I am a beta tester for the MIT/SIO GAMIT/GLOBK package which computes GPS data.
The package is a numerical intensive package that runs across several platforms
and operating systems. In my lab I have strict SUN/SOLARIS hardware and software
and 686 based hardware running Red Hat systems and GNU Fortran.
We are seeing an increased fequency of computational differences between our
benchmark Solaris systems and the 686 systems particulary those that have
installed Reh Hat 8.0 with GNU 3.2.1. The problem doesnt appear to be present in
the older 3.05 GNU systems.
We usually resolve these difference by down grading the level of optimozation
from -O3 to -O. In the areas that we have had to do this recently we have not
lost too much performance but there is the work that a major CPU bound routine
will soon be effected.
I would appreciate comments on where to look and what tracing/tracking we might
employ to understand these problems more.
I am willing to provide detailed info on any of the examples that I have.
regards Peter
Peter Morgan
School of Computing
University of Canberra
email peterm@ise.canberra.edu.au
================================================================
A/Prof Peter Morgan
School of Computing
University of Canberra
Canberra, ACT, 2600
Australia
Voice: +61-(0)2-6201-2557
Fax: +61-(0)2-6201-5213
Mobile: +61-(0)4-1854-0137
email: pjm@ise.canberra.edu.au
OR peterm@ise.canberra.edu.au
================================================================