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I've always wished I could do some profiling like you get in Wolfram Workbench, but directly from Mathematica, without using or having Workbench.

How can I do it? How? It would be really nice!! Please help me!

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Related question. – Leonid Shifrin Jul 1 '12 at 20:10
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I love the Please help me! part – belisarius Jul 1 '12 at 20:23
also related stackoverflow.com/questions/4721171/… – belisarius Jul 1 '12 at 20:24

1 Answer

up vote 36 down vote accepted

You can put your Mathematica session in debug mode by going to Evaluation->Debugger

Then, make some definitions and wrap the profiled code in RuntimeTools`Profile

For example, in debug mode, run

f[x_] := x^2

Table[f[x], {100000}]; // RuntimeTools`Profile

and you get a nice

Mathematica graphics

As @acl mentioned in the comments, clicking in the gray area in the output notebook's lines takes you to the related code

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Any idea, why test[] := Module[{}, Print["Here"]; Pause[0.1]; Print["There"]; Pause[1]; Return[2]] and test[] // RuntimeTools`Profile does not work, even though your example works correctly? – Ajasja Jul 2 '12 at 8:37
Also, do you happen to know what RuntimeTools`ProfileFunction does? – Ajasja Jul 2 '12 at 10:15
@Ajasja, sorry about the name ;). I am not sure. It don't think this profiler is without quirks. For starters, I think it doesn't account for Pauses, and without those pauses your code is too fast – Rojo Jul 2 '12 at 19:55
@Ajasja, I don't konw what that function does. It doesn't seem to be directly used by the profiler but, it seems to receive a matrix in which each row represents a function, the first column is the number of calls, the second the time taken overall, the third the code in question, and the fourth some number that relates either to the order of execution or something it uses to filter what to show. And returns the profiler notebook – Rojo Jul 2 '12 at 20:07
I get rather inconsistent results with this example. The line with x^2 is sometimes printed, sometimes not. When it is, it lists 200,000 calls instead of 100,000 – Sjoerd C. de Vries Nov 25 '12 at 16:10
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