Devel::GraphVizProf 2.10

Devel::GraphVizProf is a per-line Perl profiler (with graph output).

SYNOPSIS

perl -d:GraphVizProf test.pl > test.dot
dot -Tpng test.dot > test.png

NOTE: This module is a hack of Devel::SmallProf by Ted Ashton. It has been modified by Leon Brocard to produce output for GraphViz, but otherwise the only thing I have done is change the name. I hope to get my patches put into the main Devel::SmallProf code eventually, or alternatively read the output of Devel::SmallProf. Anyway, the normal documentation, which you can probably ignore, follows.

The Devel::GraphVizProf profiler is focused on the time taken for a program run on a line-by-line basis. It is intended to be as "small" in terms of impact on the speed and memory usage of the profiled program as possible and also in terms of being simple to use. Those statistics are placed in the file smallprof.out in the following format:

< num > < time > < ctime > < line >:< text >

where < num > is the number of times that the line was executed, < time > is the amount of "wall time" (time according the the clock on the wall vs. cpu time) spent executing it, < ctime > is the amount of cpu time expended on it and < line > and < text > are the line number and the actual text of the executed line (read from the file).

The package uses the debugging hooks in Perl and thus needs the -d switch, so to profile test.pl, use the command:

perl5 -d:GraphVizProf test.pl

Once the script is done, the statistics in smallprof.out can be sorted to show which lines took the most time. The output can be sorted to find which lines take the longest, either with the sort command:

sort -k 2nr,2 smallprof.out | less

or a perl script:

open(PROF,"smallprof.out");
@sorted = sort {(split(/s+/,$b))[2]
(split(/s+/,$a))[2]} ;
close PROF;
print join('',@sorted);


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Requirements:

· Perl