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Re: Speed of Ocave vs Matlab?

From: Carlo De Falco
Subject: Re: Speed of Ocave vs Matlab?
Date: Tue, 8 Sep 2015 09:43:24 +0000

On 8 Sep 2015, at 10:01, Alexander Barth <address@hidden> wrote:

> On Mon, Sep 7, 2015 at 11:14 PM, Michael Barnes <address@hidden> wrote:
> I just got asked this question at a computer vision conference. Does anyone 
> have any benchmark examples I can quote?
> It strongly depends on the type of benchmark. In my tests, octave turned out 
> the be faster than Matlab:
> http://www.geosci-model-dev.net/7/225/2014/gmd-7-225-2014.pdf
> (table 4 on page 9, open access journal under creative commons).
> The code needs to solve a sparse system defined by a partial differential 
> equation. Large-parts of the code are vectorized and the only loops are 
> essentially the number of dimensions (which is typically 2 or 3).
> I was actually surprised by this results and I did not perform any 
> optimization specific to octave. I only vectorized the code which is 
> beneficial for octave and Matlab.
> In the above mentioned paper, you will however also find some references 
> where Matlab was faster than Octave.
> The conclusion for me is: if performance is important, you need to vectorize 
> the code as much as possible. This is not only necessary for octave but also 
> for Matlab. If this is not possible, then I use a compiled language like 
> Fortran.
> I hope this helps,
> Alex


I guess you still have all the scripts to run these tests again?
I would be curiuos to see what is the comparison between Octave 3.6.4 and 4.x,
as a few users reported significant slowdown in some aplications.


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