How can I turn off a "self learning" function of Matlab?

Hello,

I've got an assignment where I was asked to compare time required for different convolutions methods. Surprisingly, time of linear convolution was significantly shorter rather than overlap add method. I heard that matlab has kind of "self learning" mechanism, that, I assume, interfered to the whole process and insert kind of unwanted correction that changed time that takes to algorithm to run. Can I turn off this mechanism, if such actually exists?

Thank you in advance, Denis

Answer 1

[Walter Roberson]

I suspect you might be referring to the Just In Time Engine (JIT). There is an undocumented

feature('jit', 'off')

Be sure to "clear all" after that in order to remove everything from MATLAB's cache.

However, if you are using data files, this will not remove the data files from your operating system's cache -- for reasonable sized files, your operating system probably left the file hanging around in memory after it was read, under the theory that it might be needed again afterwards.

You should probably be looking at the timeit() function to try to isolate how long something "really" takes: it runs the code several times to try to account for cache and JIT effects.

Answer 2

[DenisK]

I remember, that function name sounds like "unhealsh", but when I typed it in matlab help, it didn't find anything. Probably, I heard it umclear. Do you remember some function that might sound similar to it?

[Walter Roberson]

Nothing like that sounds familiar to me, especially not for any convolution methods. Perhaps something to do with "deep learning"??

Answer 3

[DenisK]

Anyways, lots of thanks. Hope (JIT) will work.