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Re: compare the executive speed with Matlab

From: John W. Eaton
Subject: Re: compare the executive speed with Matlab
Date: Fri, 2 Jan 2009 17:45:37 -0500

On  2-Jan-2009, wim van hoydonck wrote:

| To conclude, on my computer, for this test, Octave is approximately
| as fast as C, gfortran is a little bit faster and ifort is 10 times as fast.
| If you want to speed up your code, write the critical parts in Fortran, not C.

I don't think that conclusion is justified, but whatever.  Clearly it
is not the language alone, or gfortran would also be 10 times

In any case, I'm surprised by the 10 times factor.  So how about
comparing the assembly code that is generated.  What is ifort doing
that the others are missing?


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