The following module was proposed for inclusion in the Module List:
modid: Devel::Profiler
DSLIP: adpfp
description: a Perl profiler compatible with dprofpp
userid: SAMTREGAR (Sam Tregar)
chapterid: 3 (Development_Support)
communities:
none yet
similar:
Devel::DProf, Devel::AutoProfiler
rationale:
DESCRIPTION
This module implements a Perl profiler that outputs profiling data
in a format compatible with C<dprofpp>,
L<Devel::DProf|Devel::DProf>'s profile analysis tool. It is meant to
be a drop-in replacement for Devel::DProf.
RATIONAL
I created this module because I desperately needed a profiler to
optimize a large Apache/mod_perl application. Devel::DProf, however,
insisted on seg-faulting on every request. I spent many days trying
to fix Devel::DProf, but eventually I had to admit that I wasn't
going to be able to do it. Devel::DProf's virtuoso creater, Ilya
Zakharevich, was unable to spend the time to fix it. Game over.
My next stop brought me to Devel::AutoProfiler by Greg London. This
module is a pure-Perl profiler. Reading the code convinced me that
it was possible to write profiler without going the route that led
to Devel::DProf's extremely difficult code. Devel::AutoProfiler is a
good module but I found several problems.
First, Devel::AutoProfiler doesn't output data in the format used
by C<dprofpp>. I like C<dprofpp> - it has every option I could want
and the C<tmon.out> format is well designed and concise. In
contrast, Devel::AutoProfiler stores its profiling data in memory
and then dumps its data to STDOUT all in one go.
Second, Devel::AutoProfiler is a heavy user of memory. It creates
an entirely new code block with eval(STRING) for each subroutine it
instruments. Also, storing profile data in memory could result in
significant problems on long runs.
Finally, Devel::AutoProfiler has some (seemingly) arbitrary
limitations. It won't profile subroutines in Data::Dumper or
Time::HiRes and if a subroutine begins with "__" it won't be
profiled either.
Thus, Devel::Profiler was born - an attempt to create a
dprofpp-compatible profiler that avoids Devel::DProf's most
debilitating bugs.
enteredby: SAMTREGAR (Sam Tregar)
enteredon: Thu May 16 20:59:20 2002 GMT
The resulting entry would be:
Devel::
::Profiler adpfp a Perl profiler compatible with dprofpp SAMTREGAR
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