NAME
    Devel::EndStats - Display run time and dependencies after running code

VERSION
    This document describes version 0.18 of Devel::EndStats (from Perl
    distribution Devel-EndStats), released on 2014-11-13.

SYNOPSIS
     # from the command line
     % perl -MDevel::EndStats script.pl

     ##### sample output #####
     <normal script output, if any...>

     # BEGIN stats from Devel::EndStats
     # Program runtime duration: 0.055s
     # Total number of required files loaded: 132
     # Total number of required lines loaded: 48772
     # END stats

     ##### sample output (with verbose=1, some cut) #####
     <normal script output, if any...>

     # BEGIN stats from Devel::EndStats
     # Program runtime duration: 0.055s
     # Total number of required files loaded: 132
     # Total number of required lines loaded: 48772
     #   #  1   1747 lines  0.023489s( 43%)  Log/Any/App.pm (loaded by main)
     #   # 52   1106 lines  0.015112s( 28%)  Log/Log4perl/Logger.pm (loaded by Log::Log4perl)
     #   # 17    190 lines  0.011983s( 22%)  Log/Any/Adapter.pm (loaded by Log::Any::App)
     #   # 18    152 lines  0.011679s( 21%)  Log/Any/Manager.pm (loaded by Log::Any::Adapter)
     #   #  5    981 lines  0.007299s( 13%)  File/Path.pm (loaded by Log::Any::App)
     ...
     # END stats

DESCRIPTION
    Devel::EndStats runs in the END block, displaying various statistics
    about your program, such as:

    *   how many seconds the program ran;

    *   how many required files and total number of lines loaded (from
        %INC);

    *   etc.

    Some notes/caveats:

    Devel::EndStats should be loaded before other modules, for example by
    running it on the command-line, as shown in the SYNOPSIS.

OPTIONS
    Some options are accepted. They can be passed via the use statement:

     # from the command line
     % perl -MDevel::EndStats=verbose,1 script.pl

     # from script
     use Devel::EndStats verbose=>1;

    or via the DEVELENDSTATS_OPTS environment variable:

     % DEVELENDSTATS_OPTS='verbose=1' perl -MDevel::EndStats script.pl

    *   verbose => BOOL (default: 0)

        Can also be set via VERBOSE environment variable. If set to true,
        display more statistics (like per-module statistics).

    *   sort => STR (default: '-time')

        Set how to sort the list of loaded modules ('file' = by file, 'time'
        = by load time, 'caller' = by first caller's package, 'order' = by
        order of loading, 'lines' = by number of lines). Only relevant when
        'verbose' is on.

    *   force => BOOL (default: 0)

        By default, if BEGIN phase did not succeed, stats will not be shown.
        This option forces displaying the stats.

    *   hide_core => BOOL (default: 0)

        Whether to hide core modules while listing modules in "verbose"
        mode.

    *   hide_noncore => BOOL (default: 0)

        Whether to hide non-core modules while listing modules in "verbose"
        mode.

    *   show_memsize => BOOL (default: 0)

        Whether to show memory usage information. Currently this is done by
        probing "/proc/$$/statm" because some other memory querying modules
        are unusable (e.g. Devel::SizeMe currently segfaults on my system,
        "Devel::InterpreterSize" is too heavy).

FAQ
  What is the purpose of this module?
    This module might be useful during development. I first wrote this
    module when trying to reduce startup overhead of a command line
    application, by looking at how many modules the app has loaded and try
    to avoid loading modules whenever it's unnecessary.

  Can you add (so and so) information to the stats?
    Sure, if it's useful. As they say, (comments|patches) are welcome.

SEE ALSO
    There are many modules on CPAN that can be used to generate dependency
    information for your code. Neil Bowers has written a review
    <http://neilb.org/reviews/dependencies.html> that covers most of them.

KNOWN ISSUES
    * Timing and memory usage is inclusive instead of exclusive.

TODO
    * Stat: system/user time.

    * Stat: number of open files (sockets).

    * Stat: number of child processes.

    * Stat: number of actual code lines (vs blanks, data, comment, POD)

    * Stat: number of XS vs PP modules.

    * Feature: remember last run's stats, compare with current run.

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Devel-EndStats>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Devel-EndStats>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Devel-EndStats>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2014 by perlancar@cpan.org.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.