FAQ 3.6 How do I profile my Perl programs?
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From: PerlFAQ Server on 8 Apr 2010 18:00 This is an excerpt from the latest version perlfaq3.pod, which comes with the standard Perl distribution. These postings aim to reduce the number of repeated questions as well as allow the community to review and update the answers. The latest version of the complete perlfaq is at http://faq.perl.org . -------------------------------------------------------------------- 3.6: How do I profile my Perl programs? (contributed by brian d foy, updated Fri Jul 25 12:22:26 PDT 2008) The "Devel" namespace has several modules which you can use to profile your Perl programs. The "Devel::DProf" module comes with Perl and you can invoke it with the "-d" switch: perl -d:DProf program.pl After running your program under "DProf", you'll get a tmon.out file with the profile data. To look at the data, you can turn it into a human-readable report with the "dprofpp" program that comes with "Devel::DProf". dprofpp You can also do the profiling and reporting in one step with the "-p" switch to "dprofpp": dprofpp -p program.pl The "Devel::NYTProf" (New York Times Profiler) does both statement and subroutine profiling. It's available from CPAN and you also invoke it with the "-d" switch: perl -d:NYTProf some_perl.pl Like "DProf", it creates a database of the profile information that you can turn into reports. The "nytprofhtml" command turns the data into an HTML report similar to the "Devel::Cover" report: nytprofhtml CPAN has several other profilers that you can invoke in the same fashion. You might also be interested in using the "Benchmark" to measure and compare code snippets. You can read more about profiling in *Programming Perl*, chapter 20, or *Mastering Perl*, chapter 5. perldebguts documents creating a custom debugger if you need to create a special sort of profiler. brian d foy describes the process in *The Perl Journal*, "Creating a Perl Debugger", http://www.ddj.com/184404522 , and "Profiling in Perl" http://www.ddj.com/184404580 . Perl.com has two interesting articles on profiling: "Profiling Perl", by Simon Cozens, http://www.perl.com/lpt/a/850 and "Debugging and Profiling mod_perl Applications", by Frank Wiles, http://www.perl.com/pub/a/2006/02/09/debug_mod_perl.html . Randal L. Schwartz writes about profiling in "Speeding up Your Perl Programs" for *Unix Review*, http://www.stonehenge.com/merlyn/UnixReview/col49.html , and "Profiling in Template Toolkit via Overriding" for *Linux Magazine*, http://www.stonehenge.com/merlyn/LinuxMag/col75.html . -------------------------------------------------------------------- The perlfaq-workers, a group of volunteers, maintain the perlfaq. They are not necessarily experts in every domain where Perl might show up, so please include as much information as possible and relevant in any corrections. The perlfaq-workers also don't have access to every operating system or platform, so please include relevant details for corrections to examples that do not work on particular platforms. Working code is greatly appreciated. If you'd like to help maintain the perlfaq, see the details in perlfaq.pod. |