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| From: | Dmitri A. Sergatskov |
| Subject: | Re: False alarm (Re: reshape slowdown?) |
| Date: | Fri, 25 Feb 2005 12:46:31 -0700 |
| User-agent: | Mozilla Thunderbird (X11/20041216) |
For the curious one: ftp://coffee.phys.unm.edu/pub/dima/octave/cpuscale.png Is the output of slightly modified Paul's script which compute the time required to transpose the square matrix. The plot shows times obtained in SMP mode and in uni-processor (UP) mode on the same hardware (2xAthlon 2000MHz / 1 GB RAM). The swap was turned off for the test. One can see a curious region around D=2000 to 4000 when UP outperform SMP by almost a factor of 3. The reason for deviation from O(d^2) law at high D is not clear to me either. Sincerely, Dmitri. -- ------------------------------------------------------------- Octave is freely available under the terms of the GNU GPL. Octave's home on the web: http://www.octave.org How to fund new projects: http://www.octave.org/funding.html Subscription information: http://www.octave.org/archive.html -------------------------------------------------------------
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