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Re: Matrix benchmark
From: |
Dmitri A. Sergatskov |
Subject: |
Re: Matrix benchmark |
Date: |
Mon, 28 Jul 2003 13:35:19 -0600 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 |
John W. Eaton wrote:
On 28-Jul-2003, address@hidden <address@hidden> wrote:
...
| octave-2.1.50:35> A = rand(2048,2048);
| octave-2.1.50:36> tic; B=fft(A); toc
| ans = 0.84838
|
| >> A = rand(2048,2048);
| >> tic; B=fft(A); toc
| elapsed_time =
| 0.5116
Me too ( 0.7 / 0.5 on atlon mp 2200+)
Even if you use FFTW with Octave, there is no guarantee that it is
precisely the same as the version used by Matlab.
I think one of the differences is the version of the compiler used.
In my experience, on x86 platform, 2.95.x does a better job than
any 3.[012].* (have not tried 3.3.x yet). For both fftw and atlas.
jwe
Regards,
Dmitri.
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