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NYTPROFHTML(1)        User Contributed Perl Documentation       NYTPROFHTML(1)

       nytprofhtml - Generate reports from Devel::NYTProf data

       Typical usage:

        $ perl -d:NYTProf
        $ nytprofhtml --open

       Options synopsis:

        $ nytprofhtml [-h] [-d] [-m] [-o <output directory>] [-f <input file>] [--open]

       Devel::NYTProf is a powerful feature-rich Perl source code profiler.  See Devel::NYTProf for details.

       "nytprofhtml" generates a set of html reports from a single data file generated by Devel::NYTProf. (If your
       process forks you'll probably have multiple files. See Devel::NYTProf and nytprofmerge.)

       The reports include dynamic runtime analysis wherein each line and each file is analyzed based on the
       performance of the other lines and files.  As a result, you can quickly find the slowest module and the slowest
       line in a module.  Slowness is measured in three ways: total calls, total time, and average time per call.

       Coloring is based on absolute deviations from the median.  See
       <>; for more details.

       That might sound complicated, but in reality you can just run the command and enjoy your report!

       -f, --file <filename>
           Specifies the location of the file generated by Devel::NYTProf.  Default: ./nytprof.out

       -o, --out <dir>
           The directory in which to place the generated report files. Default: ./nytprof/

       -d, --delete
           Purge any existing contents of the report output directory.

       -l, --lib <dir>
           Add a path to the beginning of @INC to help nytprofhtml find the source files used by the code. Should not
           be needed in practice.

           Make your web browser visit the report after it has been generated.

           If this doesn't work well for you, try installing the Browser::Open module.

       -m, --minimal
           Don't generate graphviz .dot files or block/sub-level reports.

           Disable generation of the flamegraph on the index page.  Also disables calculation of distinct call stacks
           that are used to produce the flamegraph.

       -h, --help
           Print the help message.

       You can see a complete report for a large application at

       The report was generated by profiling perlcritic 1.121 checking its own source code using perl v5.18.2.

   "Unable to open '... (autosplit into ...)'"
       The profiled application executed code in a module that used AutoLoader to load the code from a separate .al
       file.  NYTProf automatically recognises this situation and tries to determine the 'parent' module file so it
       can associate the profile data with it.  In order to do that the parent module file must already be 'known' to
       NYTProf, typically by already having some code profiled.

       You're only likely to see this warning if you're using the "start" option to start profiling after compile-
       time. The effect is that times spent in autoloaded subs won't be associated with the parent module file and you
       won't get annotated reports for them.

       You can avoid this by using the default "start=begin" option, or by ensuring you execute some non-autoloaded
       code in the parent module, while the profiler is running, before an autoloaded sub is called.

       Subroutine-level profilers:

         Devel::DProf        | 1995-10-31 | ILYAZ
         Devel::AutoProfiler | 2002-04-07 | GSLONDON
         Devel::Profiler     | 2002-05-20 | SAMTREGAR
         Devel::Profile      | 2003-04-13 | JAW
         Devel::DProfLB      | 2006-05-11 | JAW
         Devel::WxProf       | 2008-04-14 | MKUTTER

       Statement-level profilers:

         Devel::SmallProf    | 1997-07-30 | ASHTED
         Devel::FastProf     | 2005-09-20 | SALVA
         Devel::NYTProf      | 2008-03-04 | AKAPLAN
         Devel::Profit       | 2008-05-19 | LBROCARD

       Devel::NYTProf is a (now distant) fork of Devel::FastProf, which was itself an evolution of Devel::SmallProf.

       Adam Kaplan took Devel::FastProf and added html report generation (based on Devel::Cover) and a test suite - a
       tricky thing to do for a profiler.  Meanwhile Tim Bunce had been extending Devel::FastProf to add novel per-sub
       and per-block timing, plus subroutine caller tracking.

       When Devel::NYTProf was released Tim switched to working on Devel::NYTProf because the html report would be a
       good way to show the extra profile data, and the test suite made development much easier and safer.

       Then he went a little crazy and added a slew of new features, in addition to per-sub and per-block timing and
       subroutine caller tracking. These included the 'opcode interception' method of profiling, ultra-fast and robust
       inclusive subroutine timing, doubling performance, plus major changes to html reporting to display all the
       extra profile call and timing data in richly annotated and cross-linked reports.

       Steve Peters came on board along the way with patches for portability and to keep NYTProf working with the
       latest development Perl versions.

       Adam's work is sponsored by The New York Times Co. <>;.  Tim's work was partly sponsored
       by Shopzilla. <>;.

       Mailing list and discussion at <>;

       Public SVN Repository and hacking instructions at <>;

       Devel::NYTProf, Devel::NYTProf::Reader, nytprofcsv

       Adam Kaplan, "<akaplan at>".  Tim Bunce, <>; and
       <>;.  Steve Peters, "<steve at>".

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself,
       either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.

perl v5.10.1                      2016-03-25                    NYTPROFHTML(1)