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Bencher-Scenarios-BitManipulation-0.001
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NAME

Bencher::Scenario::BitManipulation::Set - Benchmark setting bits

VERSION

This document describes version 0.001 of Bencher::Scenario::BitManipulation::Set (from Perl distribution Bencher-Scenarios-BitManipulation), released on 2017-01-26.

SYNOPSIS

To run benchmark with default option:

% bencher -m BitManipulation::Set

To run module startup overhead benchmark:

% bencher --module-startup -m BitManipulation::Set

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.

Bit::Manip 1.01

Bit::Manip::PP 1.00

BENCHMARK PARTICIPANTS

  • 1k-vec-data=1byte-set=1bit (perl_code)

    Code template:

    state $data = "\0"; for(1..1000) { vec($data, 4, 1) = 1 }

  • 1k-vec-data=1byte-set=3bit (perl_code)

    Code template:

    state $data = "\0"; for(1..1000) { vec($data, 4, 4) = 0b1011 }

  • 1k-bit_on-data=1byte-set=1bit (perl_code)

    Code template:

    state $data = 0; for(1..1000) { $data = Bit::Manip::bit_on($data, 3) }

  • 1k-bit_on-pp-data=1byte-set=1bit (perl_code)

    Code template:

    state $data = 0; for(1..1000) { $data = Bit::Manip::PP::bit_on($data, 3) }

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 BitManipulation::Set):

#table1#
+----------------------------------+-----------+-----------+------------+---------+---------+
| participant                      | rate (/s) | time (μs) | vs_slowest |  errors | samples |
+----------------------------------+-----------+-----------+------------+---------+---------+
| 1k-vec-data=1byte-set=3bit       |  3656.548 |  273.482  |   1        | 9.5e-12 |      22 |
| 1k-vec-data=1byte-set=1bit       |  3659.872 |  273.2336 |   1.000909 | 9.5e-12 |      29 |
| 1k-bit_on-data=1byte-set=1bit    |  3891.724 |  256.9555 |   1.064316 |   1e-11 |      20 |
| 1k-bit_on-pp-data=1byte-set=1bit |  4854.13  |  206.01   |   1.32752  | 4.7e-11 |      20 |
+----------------------------------+-----------+-----------+------------+---------+---------+

Benchmark module startup overhead (bencher -m BitManipulation::Set --module-startup):

#table2#
+---------------------+------------------------------+--------------------+----------------+-----------+------------------------+------------+---------+---------+
| participant         | proc_private_dirty_size (kB) | proc_rss_size (MB) | proc_size (MB) | time (ms) | mod_overhead_time (ms) | vs_slowest |  errors | samples |
+---------------------+------------------------------+--------------------+----------------+-----------+------------------------+------------+---------+---------+
| Bit::Manip          | 844                          | 4.1                | 16             |       9.1 |                    3.6 |        1   | 2.4e-05 |      21 |
| Bit::Manip::PP      | 1044                         | 4.5                | 18             |       8.8 |                    3.3 |        1   | 1.7e-05 |      20 |
| perl -e1 (baseline) | 844                          | 4.2                | 16             |       5.5 |                    0   |        1.6 | 1.5e-05 |      20 |
+---------------------+------------------------------+--------------------+----------------+-----------+------------------------+------------+---------+---------+

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

BENCHMARK NOTES

Differences between vec() and Bit::Manip routines:

  • vec() counts bit position from left, while Bit::Manip from right

  • vec() works with binary data, while Bit::Manip expects numbers

  • Bit::Manip currently supports only 32-bit number while vec() far more than that

  • Bit::Manip provides convenience functions for toggling, masking, shifting, and bit counting

  • vec() provides convenience when setting multiple bits in one go

HOMEPAGE

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

SOURCE

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

BUGS

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

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) 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.