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[Bug libfortran/23363] gfortran 30 x slower that g77 on random I/O
- From: "jblomqvi at cc dot hut dot fi" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 9 Oct 2005 17:41:02 -0000
- Subject: [Bug libfortran/23363] gfortran 30 x slower that g77 on random I/O
- References: <bug-23363-10129@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from jblomqvi at cc dot hut dot fi 2005-10-09 17:41 -------
(In reply to comment #8)
> Can you do timings with today's compiler?
>
Performance is now equivalent with g77, a factor of 500 times faster than
mainline a month ago. I don't know if any of these patches have made it into
4.0.
The actual timings:
Original timing (with mmap): 13.6 s.
Getting rid of mmap (committed 2005-09-10 or thereabouts): 0.77 s.
transfer_array (committed 2005-09-24): 0.040 s
sread/swrite (the patch committed 2005-10-07): 0.026 s.
g77: 0.027 s
ifort 9.0: 0.153 s.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23363