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Re: matlab/octave performance hit


From: Steve Thompson
Subject: Re: matlab/octave performance hit
Date: Thu, 18 Oct 2007 15:26:16 -0700

As a data point ... my CentOS 4.5 laptop (1.7 GHz processor, 2 GB
RAM) running both

  Matlab, Version 7.4.0.336 (R2007a), and
  GNU Octave, version 2.1.57 (i686-pc-linux-gnu),

results in:

  N = 200
  Matlab = 0.000064
  Octave = 0.023521
  0.023521 / 0.000064 = 367.52

  N = 1e6
  Matlab = 0.075629
  Octave = 0.32375
  0.32375 / 0.075629 = 4.2807

  N = 2e7
  Matlab = 1.667574
  Octave = 4.0107
  4.0107 / 1.667574 = 2.4051

when computing `tic; test = 1 : N; cumsum (test); toc'.

So, as David guessed, the overhead is much less dramatic as N
gets bigger.

Steve


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