# Algorithm::Diff::XS

Section: User Contributed Perl Documentation (3pm)

Updated: 2018-11-03

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## 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.