Can you measure the performance of a function that calls multiple functions within using 'timeit'?

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shreya 2019-10-16

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https://ww2.mathworks.cn/matlabcentral/answers/485592-can-you-measure-the-performance-of-a-function-that-calls-multiple-functions-within-using-timeit

评论： shreya 2019-10-16

I want to use timeit (or tic-toc) to measure the performance of a function. I am calling this function within a loop to measure the timing information multiple times and then averaging. When I run this function once, suppose the timing is measured to be m1±s1 (mean±standard deviation) across N runs (in the loop that I mentioned). The standard deviation is not very high, quite acceptable. However, if I execute this loop again, say in an hour, it becomes m2±s2, the mean changes to m2 which is quite different from m1. s2 however remains small. Can I know how to use timeit properly? What factors does it depend on?

P.S. I am NOT doing the following within the functions (as mentioned in the timeit documentation)

Using timeit between tic and toc
Using timeit to time a function that includes calls to tic and toc
Using timeit recursively

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Rik 2019-10-16

I don't think that should matter, as long as you run the function with the same input.

If your function contacts some server, there will be a dependency on your internet connection, but I don't see any such external factors in your description.

Also, your question is not urgent, the reason for that is explained here. I therefore removed that part from your question title.

shreya 2019-10-16