NAME

Bencher::Scenario::TimeHiRes::sleep_accuracy - Demonstrate inaccuracy of doing lots of small sleep

VERSION

This document describes version 0.002 of Bencher::Scenario::TimeHiRes::sleep_accuracy (from Perl distribution Bencher-Scenarios-TimeHiRes), released on 2017-01-25.

SYNOPSIS

To run benchmark with default option:

% bencher -m TimeHiRes::sleep_accuracy

To run module startup overhead benchmark:

% bencher --module-startup -m TimeHiRes::sleep_accuracy

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

DESCRIPTION

Packaging a benchmark script as a Bencher scenario makes it convenient to include/exclude/add participants/datasets (either via CLI or Perl code), send the result to a central repository, among others . See Bencher and bencher (CLI) for more details.

BENCHMARKED MODULES

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

Time::HiRes 1.9733

BENCHMARK PARTICIPANTS

• 1e-1 x1 (perl_code)

  Function call template:

  Time::HiRes::sleep(1e-1)

• 1e-2 x10 (perl_code)

  Function call template:

  Time::HiRes::sleep(1e-2) for 1..10

• 1e-3 x100 (perl_code)

  Function call template:

  Time::HiRes::sleep(1e-3) for 1..100

• 1e-4 x1000 (perl_code)

  Function call template:

  Time::HiRes::sleep(1e-4) for 1..1000

• 1e-5 x10000 (perl_code)

  Function call template:

  Time::HiRes::sleep(1e-5) for 1..10000

• 1e-6 x100000 (perl_code)

  Function call template:

  Time::HiRes::sleep(1e-6) for 1..100_000

SAMPLE BENCHMARK RESULTS

Run on: perl: v5.24.0, CPU: Intel(R) Core(TM) M-5Y71 CPU @ 1.20GHz (2 cores), OS: GNU/Linux LinuxMint version 17.3, OS kernel: Linux version 3.19.0-32-generic.

Benchmark with default options (bencher -m TimeHiRes::sleep_accuracy):

#table1#
+--------------+-----------+-------+------------+----------+---------+
| participant  | rate (/s) |  time | vs_slowest |  errors  | samples |
+--------------+-----------+-------+------------+----------+---------+
| 1e-6 x100000 |      0.19 | 5.4   |        1   |   0.0059 |       7 |
| 1e-5 x10000  |      1.6  | 0.63  |        8.6 |   0.0012 |       9 |
| 1e-4 x1000   |      6.4  | 0.16  |       35   |   0.0004 |       7 |
| 1e-3 x100    |      9.08 | 0.11  |       49   | 6.2e-05  |       6 |
| 1e-2 x10     |      9.89 | 0.101 |       53.4 | 4.4e-05  |       7 |
| 1e-1 x1      |      9.99 | 0.1   |       53.9 | 1.1e-05  |       7 |
+--------------+-----------+-------+------------+----------+---------+

Benchmark module startup overhead (bencher -m TimeHiRes::sleep_accuracy --module-startup):

#table2#
+---------------------+------------------------------+--------------------+----------------+-----------+------------------------+------------+---------+---------+
| participant         | proc_private_dirty_size (MB) | proc_rss_size (MB) | proc_size (MB) | time (ms) | mod_overhead_time (ms) | vs_slowest |  errors | samples |
+---------------------+------------------------------+--------------------+----------------+-----------+------------------------+------------+---------+---------+
| Time::HiRes         | 1                            | 5                  | 20             |      10   |                    5.5 |        1   | 0.00012 |       7 |
| perl -e1 (baseline) | 1.3                          | 4.6                | 20             |       4.5 |                    0   |        2.5 | 1e-05   |       6 |
+---------------------+------------------------------+--------------------+----------------+-----------+------------------------+------------+---------+---------+

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-Scenarios-TimeHiRes.

SOURCE

Source repository is at https://github.com/perlancar/perl-Bencher-Scenarios-TimeHiRes.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Bencher-Scenarios-TimeHiRes

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.

SEE ALSO

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2017 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.

cpanm Bencher::Scenarios::TimeHiRes

perl -MCPAN -e shell
install Bencher::Scenarios::TimeHiRes