profiling tips suggestion

[Simon Michael]

 > Any comments, suggestions and/or improvements you have are welcome. 
Recommended “profiling tricks” would be especially cool!

Hi.. here's one, let me know if there's some other way I should send it.

Emacs can help make .prof files much clearer.

- set up hasktags and M-. so you can jump to any function from it's name

- remove unnecessary columns - use macros to delete fields you don't 
need, such as Module, No., %alloc

- use align-regexp to realign the numbers if your long function names 
have messed up the layout

- convert the call graph to a folding, colour-coded outline: use a macro 
to replace leading spaces with stars and one space, M-x org mode, 
shift-tab to cycle between all expanded and all collapsed, tab to 
expand/collapse the current function.

- use highlight-regexp and highlight-lines-matching-regexp to mark lines 
of interest, numbers above a certain threshold etc. Reduces mental work 
when you are flipping back and forth.

Thanks for the glorious ghc!

-Simon
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