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From: "Ben dot Diedrich at noaa dot gov" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/14563] octave built under Cygwin very slow
Date: Wed, 24 Mar 2004 21:07:00 -0000 [thread overview]
Message-ID: <20040324210746.457.qmail@sources.redhat.com> (raw)
In-Reply-To: <20040312233606.14563.paulthomas2@wanadoo.fr>
------- Additional Comments From Ben dot Diedrich at noaa dot gov 2004-03-24 21:07 -------
Subject: Re: octave built under Cygwin very slow
Paul Thomas wrote:
> We ran a small test programme in octave that shows a factor of
> approximately 6 difference in execution time, when octave is built with
> gcc-3.2 (~1.8-2s) or gcc-3.3 (10-12s). When compiled and linked with
> -pg set, the execution time increased to 9s with gcc-3.2 (Ben, what is
> the corresponding figure for gcc-3.3?). Switching off the -O2 flags,
> increased the time by a further 3s but resulted in a much more detailed
> profile. In the enclosed, we increased the number of loops by a factor
> of 10, in order to get a reasonable resolution on the less frequently
> visited functions. So remember that the corresponding wall-clock time
> is 90s for cycle 2.
>
The execution time of Octave 2.1.50 with profiling turned on and GCC 3.3.1 was ~280 seconds. That is with the test command:
a = cputime ; tot = 0 ; x = [1:1e6] ; for i = 1:1e6 ; tot = tot + x(i) ; end ; disp(cputime-a)
The time is ~28 seconds with 1e5 for loop steps.
Ben
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14563
next prev parent reply other threads:[~2004-03-24 21:07 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-12 23:36 [Bug c++/14563] New: " paulthomas2 at wanadoo dot fr
2004-03-13 7:24 ` [Bug c++/14563] " pinskia at gcc dot gnu dot org
2004-03-13 8:06 ` paulthomas2 at wanadoo dot fr
2004-03-14 20:33 ` bangerth at dealii dot org
2004-03-24 9:52 ` paulthomas2 at wanadoo dot fr
2004-03-24 15:57 ` bangerth at dealii dot org
2004-03-24 16:38 ` paulthomas2 at wanadoo dot fr
2004-03-24 17:03 ` bangerth at dealii dot org
2004-03-24 21:07 ` Ben dot Diedrich at noaa dot gov [this message]
2004-03-24 22:58 ` dannysmith at users dot sourceforge dot net
2004-03-25 6:40 ` paulthomas2 at wanadoo dot fr
2004-03-25 13:43 ` bangerth at dealii dot org
2004-03-25 14:16 ` Ben dot Diedrich at noaa dot gov
2004-03-25 14:17 ` paulthomas2 at wanadoo dot fr
2004-03-25 14:26 ` paulthomas2 at wanadoo dot fr
2004-03-25 14:37 ` bangerth at dealii dot org
2004-03-25 15:37 ` Ben dot Diedrich at noaa dot gov
2004-03-25 16:41 ` paulthomas2 at wanadoo dot fr
2004-03-28 21:19 ` paulthomas2 at wanadoo dot fr
2004-03-28 22:28 ` pkienzle at users dot sf dot net
2004-03-31 0:21 ` paulthomas2 at wanadoo dot fr
2004-04-02 17:43 ` paulthomas2 at wanadoo dot fr
2004-04-02 19:55 ` bangerth at dealii dot org
2004-04-02 20:35 ` dannysmith at users dot sourceforge dot net
2004-04-02 20:41 ` pcarlini at suse dot de
2004-04-02 20:44 ` bangerth at dealii dot org
2004-04-03 9:10 ` paulthomas2 at wanadoo dot fr
2004-04-03 17:19 ` epanelelytha at kellertimo dot de
2004-04-03 17:54 ` paulthomas2 at wanadoo dot fr
2004-04-03 18:00 ` epanelelytha at kellertimo dot de
2004-04-03 18:24 ` paulthomas2 at wanadoo dot fr
2004-07-12 14:50 ` [Bug libstdc++/14563] new/delete much slower than malloc/free pinskia at gcc dot gnu dot org
2004-07-12 19:21 ` paulthomas2 at wanadoo dot fr
2004-07-12 20:55 ` bangerth at dealii dot org
2004-07-13 4:17 ` paulthomas2 at wanadoo dot fr
2004-07-28 2:50 ` ron_hylton at hotmail dot com
2004-07-28 3:57 ` ron_hylton at hotmail dot com
2004-07-28 6:03 ` [Bug target/14563] " pinskia at gcc dot gnu dot org
2004-07-29 4:23 ` ron_hylton at hotmail dot com
2004-08-08 9:24 ` paulthomas2 at wanadoo dot fr
2004-11-10 8:21 ` [Bug target/14563] [3.3/3.4/4.0 Regression] new/delete much slower than malloc/free because of sjlj exceptions giovannibajo at libero dot it
2004-11-10 8:21 ` giovannibajo at libero dot it
2004-11-10 9:10 ` dannysmith at users dot sourceforge dot net
2004-11-10 12:46 ` [Bug target/14563] " pinskia at gcc dot gnu dot org
2004-11-10 16:20 ` ron_hylton at hotmail dot com
2004-11-10 17:05 ` kjd at duda dot org
2004-11-13 11:03 ` paulthomas2 at wanadoo dot fr
2004-11-14 17:03 ` ken dot duda at gmail dot com
2004-11-14 18:04 ` paulthomas2 at wanadoo dot fr
2004-11-14 22:40 ` ken dot duda at gmail dot com
2005-05-12 14:53 ` pinskia at gcc dot gnu dot org
2005-05-12 14:54 ` pinskia at gcc dot gnu dot org
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