From help-request at octave dot org Fri Feb 25 13:43:00 2005
Subject: Re: False alarm (Re: reshape slowdown?)
From: "Dmitri A. Sergatskov" <dmitri at unm dot edu>
To: Paul Kienzle <pkienzle at users dot sourceforge dot net>
CC: help-Octave <help at octave dot org>
Date: Fri, 25 Feb 2005 12:46:31 -0700

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.
-- 



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