profiling usage

[Simon Marlow]

On 26 January 2005 09:13, Serge D. Mechveliani wrote:

> The indentation in the profiling report or in the source program?

In the profiling report.

> The report prints some function names not from the beginning of the
> line ...
> Maybe, you can give a simple example of a program with SCC when the
> center is printed twice? For I do not understand this point.

eg.

  f x = x * 2
  g x = f x
  main = print (f 3 + g 3)

here f is called both from main and from g, and will appear twice in the
profile.

> Now I replaced SCC with  -auto-all,  and it gives a report which
> looks satisfactory.
> The first part
>                lpo           TermComp          29.9   47.0
>                relates       Prelude1          13.1    1.5
>                ...
> is helpful all right.
> But I also need to know how many times there was called a certain
> function  f,  no matter from where it is called and whether it
> occurs in the first part of the report. I search for `f' in
> the large second part of the report. And find the two (often many)
> lines (with different indentation):
> 
>       f   Module1  10   20  ...
>       ...
>         f   Module1  121  30  ...
> 
> So, `f' was entered 20 times from one point and 30 times from another,
> and 50 times in total. Right?

Yes.

Simon