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Bencher-Scenario-IPCSystemOptions-0.02
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NAME

Bencher::Scenario::IPCSystemOptions - Measure the overhead of IPC::System::Options's system()over CORE::system()

VERSION

This document describes version 0.02 of Bencher::Scenario::IPCSystemOptions (from Perl distribution Bencher-Scenario-IPCSystemOptions), released on 2016-06-26.

SYNOPSIS

To run benchmark with default option:

% bencher -m IPCSystemOptions

To run module startup overhead benchmark:

% bencher --module-startup -m IPCSystemOptions

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

BENCHMARKED MODULES

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

IPC::System::Options 0.27

BENCHMARK PARTICIPANTS

SAMPLE BENCHMARK RESULTS

Run on: perl: v5.22.2, CPU: Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz (4 cores), OS: GNU/Linux Debian version 8.0, OS kernel: Linux version 3.16.0-4-amd64.

Benchmark with default options (bencher -m IPCSystemOptions):

+-------------+-----------+-----------+------------+---------+---------+
| participant | rate (/s) | time (ms) | vs_slowest |  errors | samples |
+-------------+-----------+-----------+------------+---------+---------+
| iso-perl    |       395 |      2.53 |       1    | 2.5e-06 |     382 |
| core-perl   |       401 |      2.49 |       1.01 | 2.5e-06 |     452 |
| iso-true    |       588 |      1.7  |       1.49 | 1.6e-06 |     278 |
| core-true   |       602 |      1.66 |       1.52 | 1.6e-06 |      87 |
+-------------+-----------+-----------+------------+---------+---------+

Benchmark module startup overhead (bencher -m IPCSystemOptions --module-startup):

+----------------------+-----------+------------------------+------------+---------+---------+
| participant          | time (ms) | mod_overhead_time (ms) | vs_slowest |  errors | samples |
+----------------------+-----------+------------------------+------------+---------+---------+
| IPC::System::Options |       6.6 |                    4.1 |       1    | 6.3e-06 |    1025 |
| perl -e1 (baseline)  |       2.5 |                    0   |       2.64 | 2.5e-06 |     334 |
+----------------------+-----------+------------------------+------------+---------+---------+

DESCRIPTION

Conclusion: Testing on my system (IPC::System::Options 0.24, perl: 5.22.0, CPU: Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz (4 cores)) shows the overhead to be ~40μs (0.04ms) so for benchmarking commands that have overhead in the range of 10-100ms we normally don't need to worry about the overhead of IPC::System::Option (0.04-0.4%) when we are using default precision (~1%).

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Bencher-Scenario-IPCSystemOptions.

SOURCE

Source repository is at https://github.com/perlancar/perl-Bencher-Scenario-IPCSystemOptions.

BUGS

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

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) 2016 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.