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Mex file is faster when it is called from command but slower when it is called inside a code!!!

Asked by Aragorn_

Aragorn_ (view profile)

on 8 Dec 2012

Hi everyone,

I am working on an optimization problem which needs to run my model several times and test for different constraints and cost. For this reason I need a model which can be simulated quickly. The solution which I found is to convert the model to a mex file. I have converted a part of the model to mex file... Now when I run this part alone to check if it is faster than m file, I observe that it is faster about 4 times. However, when I plug this mex file to the rest of the model, the result becomes slower....

Does any of you have an idea what can be a possible reason? Thanks in advanced, Reza

1 Comment

Jan Simon

Jan Simon (view profile)

on 8 Dec 2012

How did you measure the timings? I do not think that anybody can guess the reasons without seeing the code.

Aragorn_

Aragorn_ (view profile)

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1 Answer

Answer by Walter Roberson

Walter Roberson (view profile)

on 8 Dec 2012

If you have a "clear all" call, get rid of it.

4 Comments

Walter Roberson

Walter Roberson (view profile)

on 8 Dec 2012

Is this Simulink or MATLAB directly?

Aragorn_

Aragorn_ (view profile)

on 8 Dec 2012

MATLAB.

The model is about a chemical reactor which contains about 1700 ode's.

Walter Roberson

Walter Roberson (view profile)

on 8 Dec 2012

Could you profile the code to determine where it is spending its time?

Walter Roberson

Walter Roberson (view profile)

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