NAME
    Bencher::Scenario::ExceptionHandling - Benchmark various ways to do
    exception handling in Perl

VERSION
    This document describes version 0.001 of
    Bencher::Scenario::ExceptionHandling (from Perl distribution
    Bencher-Scenario-ExceptionHandling), released on 2024-02-23.

SYNOPSIS
    To run benchmark with default option:

     % bencher -m ExceptionHandling

    To run module startup overhead benchmark:

     % bencher --module-startup -m ExceptionHandling

    For more options (dump scenario, list/include/exclude/add participants,
    list/include/exclude/add datasets, etc), see bencher or run "bencher
    --help".

DESCRIPTION
    Keywords: try-catch, eval, die

    TODO: benchmark other try-catch modules.

BENCHMARKED MODULES
    Version numbers shown below are the versions used when running the
    sample benchmark.

    Try::Tiny 0.31

BENCHMARK PARTICIPANTS
    *   builtin-try (perl_code)

        Code template:

         use feature 'try'; use experimental 'try'; try { <code_try:raw> } catch($e) { <code_catch:raw> }

        Requires perl 5.34+.

    *   naive-eval (perl_code)

        Code template:

         eval { <code_try:raw> }; if ($@) { <code_catch:raw> }

    *   eval-localize-die-signal-and-eval-error (perl_code)

        Code template:

         { local $@; local $SIG{__DIE__}; eval { <code_try:raw> }; if ($@) { <code_catch:raw> } }

    *   Try::Tiny (perl_code)

        Code template:

         use Try::Tiny; try { <code_try:raw> } catch { <code_catch:raw> }

BENCHMARK DATASETS
    *   empty try, empty catch

    *   die in try, empty catch

BENCHMARK SAMPLE RESULTS
  Sample benchmark #1
    Run on: perl: *v5.38.2*, CPU: *Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz
    (2 cores)*, OS: *GNU/Linux Ubuntu version 20.04*, OS kernel: *Linux
    version 5.4.0-164-generic*.

    Benchmark command (default options):

     % bencher -m ExceptionHandling

    Result formatted as table (split, part 1 of 2):

     #table1#
     {dataset=>"die in try, empty catch"}
     +-----------------------------------------+-----------+-----------+-----------------------+-----------------------+---------+---------+
     | participant                             | rate (/s) | time (μs) | pct_faster_vs_slowest | pct_slower_vs_fastest |  errors | samples |
     +-----------------------------------------+-----------+-----------+-----------------------+-----------------------+---------+---------+
     | Try::Tiny                               |    310000 |      3.23 |                 0.00% |               602.22% | 2.1e-09 |       8 |
     | eval-localize-die-signal-and-eval-error |   1000000 |      1    |               207.56% |               128.32% | 1.2e-08 |       9 |
     | builtin-try                             |   1700000 |      0.6  |               438.20% |                30.48% | 1.1e-09 |       7 |
     | naive-eval                              |   2170000 |      0.46 |               602.22% |                 0.00% | 3.6e-10 |       8 |
     +-----------------------------------------+-----------+-----------+-----------------------+-----------------------+---------+---------+

    The above result formatted in Benchmark.pm style:

                Rate   T:T     e     b     n 
      T:T   310000/s    --  -69%  -81%  -85% 
      e    1000000/s  223%    --  -40%  -54% 
      b    1700000/s  438%   66%    --  -23% 
      n    2170000/s  602%  117%   30%    -- 
 
     Legends:
       T:T: participant=Try::Tiny
       b: participant=builtin-try
       e: participant=eval-localize-die-signal-and-eval-error
       n: participant=naive-eval

    The above result presented as chart:

    #IMAGE:
    share/images/bencher-result-1.png|/tmp/VHOUgvh_oa/bencher-result-1.png

    Result formatted as table (split, part 2 of 2):

     #table2#
     {dataset=>"empty try, empty catch"}
     +-----------------------------------------+-----------+-----------+-----------------------+-----------------------+---------+---------+
     | participant                             | rate (/s) | time (μs) | pct_faster_vs_slowest | pct_slower_vs_fastest |  errors | samples |
     +-----------------------------------------+-----------+-----------+-----------------------+-----------------------+---------+---------+
     | Try::Tiny                               |    397000 |      2.52 |                 0.00% |              6147.90% | 5.8e-10 |       8 |
     | eval-localize-die-signal-and-eval-error |   1700000 |      0.59 |               328.63% |              1357.65% | 6.5e-10 |       7 |
     | builtin-try                             |   8400000 |      0.12 |              2022.06% |               194.43% | 1.9e-10 |       7 |
     | naive-eval                              |  25000000 |      0.04 |              6147.90% |                 0.00% |   8e-11 |       7 |
     +-----------------------------------------+-----------+-----------+-----------------------+-----------------------+---------+---------+

    The above result formatted in Benchmark.pm style:

                 Rate    T:T      e     b     n 
      T:T    397000/s     --   -76%  -95%  -98% 
      e     1700000/s   327%     --  -79%  -93% 
      b     8400000/s  2000%   391%    --  -66% 
      n    25000000/s  6200%  1374%  200%    -- 
 
     Legends:
       T:T: participant=Try::Tiny
       b: participant=builtin-try
       e: participant=eval-localize-die-signal-and-eval-error
       n: participant=naive-eval

    The above result presented as chart:

    #IMAGE:
    share/images/bencher-result-2.png|/tmp/VHOUgvh_oa/bencher-result-2.png

  Sample benchmark #2
    Benchmark command (benchmarking module startup overhead):

     % bencher -m ExceptionHandling --module-startup

    Result formatted as table:

     #table3#
     +---------------------+-----------+-------------------+-----------------------+-----------------------+---------+---------+
     | participant         | time (ms) | mod_overhead_time | pct_faster_vs_slowest | pct_slower_vs_fastest |  errors | samples |
     +---------------------+-----------+-------------------+-----------------------+-----------------------+---------+---------+
     | Try::Tiny           |      14   |               8.4 |                 0.00% |               145.39% | 1.8e-05 |       7 |
     | perl -e1 (baseline) |       5.6 |               0   |               145.39% |                 0.00% | 1.6e-05 |       7 |
     +---------------------+-----------+-------------------+-----------------------+-----------------------+---------+---------+

    The above result formatted in Benchmark.pm style:

                              Rate   T:T  perl -e1 (baseline) 
      T:T                   71.4/s    --                 -60% 
      perl -e1 (baseline)  178.6/s  150%                   -- 
 
     Legends:
       T:T: mod_overhead_time=8.4 participant=Try::Tiny
       perl -e1 (baseline): mod_overhead_time=0 participant=perl -e1 (baseline)

    The above result presented as chart:

    #IMAGE:
    share/images/bencher-result-3.png|/tmp/VHOUgvh_oa/bencher-result-3.png

    To display as an interactive HTML table on a browser, you can add option
    "--format html+datatables".

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Bencher-Scenario-ExceptionHandling>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Bencher-Scenario-ExceptionHandling>.

AUTHOR
    perlancar <perlancar@cpan.org>

CONTRIBUTING
    To contribute, you can send patches by email/via RT, or send pull
    requests on GitHub.

    Most of the time, you don't need to build the distribution yourself. You
    can simply modify the code, then test via:

     % prove -l

    If you want to build the distribution (e.g. to try to install it locally
    on your system), you can install Dist::Zilla,
    Dist::Zilla::PluginBundle::Author::PERLANCAR,
    Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two
    other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps
    required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE
    This software is copyright (c) 2024 by perlancar <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.

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

    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.