Profiterole
Script for reading and restructring a GHC profile script.
The Goal
Given profile data, different ways of looking at it reveal different insights. This tool provides one of those insights - in addition to reading the standard profile output and using other tools such as Profiteur.
Profiterole aims to make the profile shorter by combining common subtrees and lifting them to the root - e.g. if you call parseFile
from 7 places in the code, instead of having 7 pieces of parseFile
profiling, Profiterole will give you one.
As an example compare HLint profile input to HLint Profiterole output.
Usage
To run, first install (cabal update && cabal install profiterole
), generate a GHC profile the normal way, then run:
profiterole myprogram.prof
Profiterole will generate myprogram.profiterole.txt
and myprogram.profiterole.html
- both contain the same information, but the HTML has hyperlinks. There are three columns of numbers:
TOT
is the total time spent in any item under this code, what GHC calls inherited time.
INH
is the total time spent in the items that Profiterole did not move out to the top level.
IND
is the individual time, just like GHC profiles.
For large programs, using +RTS -P
(instead of the common -p
) will give more accurate results.