Embedded Matlab - testing for bottlenecks

I have an embedded Matlab function that itself calls other embedded Matlab functions and which also calls mex functions. Where can I find information about how to test blocks of this code for the time it takes to execute? Ideally there is something like tic toc that I can stick before and after a block in order to determine how long it takes to execute. And perhaps tic toc even works, but I don't 开发者_如何学Goknow if I should trust it.

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Use the built in profiler:

http://www.mathworks.com/help/techdoc/ref/profile.html