---
name: "Algorithm::Diff::XS"
section: "3pm"
platform: "linux"
package: "libalgorithm-diff-xs-perl"
version: "0.04-9"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Algorithm::Diff::XS"
---

# Algorithm::Diff::XS(3pm)

Algorithm::Diff with XS core loop

## NAME

Algorithm::Diff::XS - Algorithm::Diff with XS core loop

## SYNOPSIS

```
    # Drop-in replacement to Algorithm::Diff, but "compact_diff"
    # and C<LCSidx> will run much faster for large data sets.
    use Algorithm::Diff::XS qw( compact_diff LCSidx );
```

## DESCRIPTION

This module is a simple re-packaging of Joe Schaefer's excellent but not very well-known Algorithm::LCS with a drop-in interface that simply re-uses the installed version of the Algorithm::Diff module.

Note that only the `"LCSidx"` function is optimized in XS at the moment, which means only `"compact_diff"` will get significantly faster for large data sets, while `"diff"` and `"sdiff"` will run in identical speed as `"Algorithm::Diff"`.

## BENCHMARK

```
                      Rate     Algorithm::Diff Algorithm::Diff::XS
Algorithm::Diff     14.7/s                  --                -98%
Algorithm::Diff::XS  806/s               5402%                  --
```

The benchmarking script is as below:

```
    my @data = ([qw/a b d/ x 50], [qw/b a d c/ x 50]);
    cmpthese( 500, {
        'Algorithm::Diff' => sub {
            Algorithm::Diff::compact_diff(@data)
        },
        'Algorithm::Diff::XS' => sub {
            Algorithm::Diff::XS::compact_diff(@data)
        },
    });
```

## SEE ALSO

Algorithm::Diff, Algorithm::LCS.

## AUTHORS

Audrey Tang \<cpan@audreyt.org\>

## COPYRIGHT

Copyright 2008 by Audrey Tang \<cpan@audreyt.org\>.

Contains derived code copyrighted 2003 by Joe Schaefer, \<joe+cpan@sunstarsys.com\>.

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