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[Bug libfortran/23363] gfortran 30 x slower that g77 on random I/O
- From: "kargl at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Aug 2005 17:03:34 -0000
- Subject: [Bug libfortran/23363] gfortran 30 x slower that g77 on random I/O
- References: <20050812194227.23363.dir@lanl.gov>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From kargl at gcc dot gnu dot org 2005-08-15 17:03 -------
I think this many be a duplicate of PR 21820. Also, there
has been some discussion in the fortran@ list about gfortran's
(homebrewed) internal buffering. FWIW, if you have pre-existing
files that you want to overwrite, then use status='replace' in
your open statement or delete the file before you run your
program. If you're performing random access in a file you
want to keep, then I think we're basically screwed until we
overhaul the IO subsystem.
Bugmeister, can we create a meta-bug linking 21820 and this
bug report. 21820 has an attempted analysis of the problem;
while Dale has provided a few useful programs.
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CC| |kargl at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23363