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Re: octave compiled under Cygwin and your octave-2.1.50a]
From: |
Paul Thomas |
Subject: |
Re: octave compiled under Cygwin and your octave-2.1.50a] |
Date: |
Thu, 04 Mar 2004 07:53:45 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225 |
Herewith a message forwarded from Ben Diedrich, who rebuilt octave using
an older version of gcc and regained a factor of two in speed (still
another factor ~3 to go!)
There is definitely something not right with the gcc 3.3.1/mingw
supplied with current versions of Cygwin:
Paul T
From Ben:
I have another interesting result. I used 'mirrors.sunsite.dk' as my download
server for the Cygwin's setup.exe. This site has a binary version of GCC 3.2.
G77, G++, and all other components are still version 3.3. I was able to select
GCC 3.2 from the list of packages. I installed it and configured, compiled, and
installed Octave 2.1.50 from source. I've attached my test script and a text
file summarizing the tests and results. I saw a nearly 2X improvement in speed
over the version I compiled with GCC 3.3.1. However, the speed is still 3-4X
slower than the pre-compiled version from octave-forge.
One thing I haven't done is get octave to use stdc++.dll. I've made this library
and placed it in the path (/usr/local/bin & /usr/bin) but I don't know how to
force Octave to use it. (He has subsequently done this, with little or no effect -
PT)
_____________________________________________________________________________
Run time results for three versions of Octave 2.1.5X. Tests provided by Paul
Thomas.
Pre-compiled is "octave-2.1.50a-inst.exe" from octave.sourceforge.net.
Self-compiled versions (2.1.50 & 53) were compiled on a Cygwin 1.5.7-1 system
with gcc 3.3.1-3 and gcc 3.2-3 and ATLAS BLAS 3.6.0. Configuration options
used were "--enable-shared --disable-static"
The test system is a 2.4 GHz P4 running Windows 2000.
Test Strings
1. tic;z=1;x=[1:1e5];tot=0;for i=1:1e5;;end;toc
2. tic;z=1;x=[1:1e5];tot; for i=1:1e5;tot;end;toc
3. tic;z=1;x=[1:1e5];tot=z;for i=1:1e5;tot=z;end;toc
4. tic;z=1;x=[1:1e5];tot=0;for i=1:1e5;tot=x(i);end;toc
5. tic;z=1;x=[1:1e5];tot=0;for i=1:1e5;tot=sin(z);end;toc
Results
Test Pre-compiled Self-compiled
Octave 2.1.50 2.1.50 2.1.53 2.1.50
GCC 3.2 3.3.1 3.3.1 3.2
---- -------- ------- ------- -------
1 0.066000 0.47900 0.16800 0.25400
2 0.35700 2.1030 1.7170 1.2450
3 0.61700 4.0720 3.0530 2.2860
4 1.5470 9.5670 8.4720 5.2820
5 1.3290 8.1820 6.3380 4.5840
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