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Home: Perl Programming Help: Intermediate: Perl code optimization

ssampath123 Novice Nov 2, 2011, 10:31 AM Post #1 of 6 (1694 views) Perl code optimization Can't Post Hi, I have created a comparison algorithm that will compare for difference between two files and output them. I work with large files with easily 10000+ lines. Initially, I used 1 while loop for filehandle for first file and the tie:File module to place the lines of the second file into array. Now I use the tie module for the first file too. I compare the files by initially sorting the lines based on key columns provided by user, then ignore certain columns provided by users. My comparison works fine but, it take atleast 1 hour to finish. performance is very critical and I would like to minize that time. I am pretty sure the call to the file is slowing down the program. I was wondering if you guys can give suggestions on how I can improve the performance?? \Thanks!

FishMonger Veteran Nov 2, 2011, 12:18 PM Post #2 of 6 (1684 views) Re: [ssampath123] Perl code optimization [In reply to] Can't Post Use the Devel::NYTProf module to profile your script. http://search.cpan.org/~timb/Devel-NYTProf-4.06/lib/Devel/NYTProf.pm And the Benchmark module to compare different methods of doing each section. http://search.cpan.org/~flora/perl-5.14.2/lib/Benchmark.pm (This post was edited by FishMonger on Nov 2, 2011, 12:20 PM)

ssampath123 Novice Nov 3, 2011, 8:19 AM Post #3 of 6 (1636 views) Re: [FishMonger] Perl code optimization [In reply to] Can't Post hmm..im trying to profile my code. I generated the tmon.out file But when I try to run dprofpp command my unix terminal does not recognize the command. Am not sure what I am missing.

FishMonger Veteran Nov 3, 2011, 8:36 AM Post #4 of 6 (1631 views) Re: [ssampath123] Perl code optimization [In reply to] Can't Post Sounds like you didn't install dprofpp. Did you use the depreciated Devel::DProf module to create the tmon.out file or the Devel::NYTProf module I suggested? If you used Devel::NYTProf, then use its nytprofhtml command to generate the html reports.

ssampath123 Novice Nov 3, 2011, 8:50 AM Post #5 of 6 (1629 views) Re: [FishMonger] Perl code optimization [In reply to] Can't Post hmm...I used Dprof because I did not have the NYTProf module in Devel. I also do not have authorities to place it there. Is there any workaround to this?

FishMonger Veteran Nov 3, 2011, 9:14 AM Post #6 of 6 (1628 views) Re: [ssampath123] Perl code optimization [In reply to] Can't Post You can install the module to any location where you have write permission. http://www.perlmonks.org/?node_id=128077 http://www.perl.com/pub/2002/04/10/mod_perl.html http://servers.digitaldaze.com/extensions/perl/modules.html

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