/usr/lib/perl5/Geo/Distance/XS.pm is in libgeo-distance-xs-perl 0.09-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 | package Geo::Distance::XS;
use strict;
use warnings;
use Geo::Distance;
use XSLoader;
our $VERSION = '0.09';
our $XS_VERSION = $VERSION;
$VERSION = eval $VERSION;
XSLoader::load(__PACKAGE__, $XS_VERSION);
my ($orig_distance_sub, $orig_formula_sub);
BEGIN {
$orig_distance_sub = \&Geo::Distance::distance;
$orig_formula_sub = \&Geo::Distance::formula;
}
sub import {
no warnings qw(redefine);
# Ensure the formula type is the same before and after import is called.
*Geo::Distance::distance = sub {
*Geo::Distance::distance = \&{'_distance_' . $_[0]->{formula}};
Geo::Distance::distance(@_);
};
*Geo::Distance::formula = sub {
local $Carp::CarpLevel = 1;
$orig_formula_sub->(@_);
*Geo::Distance::distance = \&{'_distance_' . $_[0]->{formula}};
};
}
# Fall back to pure perl after calling 'no Geo::Distance::XS'.
sub unimport {
no warnings qw(redefine);
*Geo::Distance::formula = $orig_formula_sub;
*Geo::Distance::distance = $orig_distance_sub;
}
1;
__END__
=head1 NAME
Geo::Distance::XS - speed up Geo::Distance
=head1 SYNOPSIS
use Geo::Distance::XS;
my $geo = Geo::Distance->new;
my $distance = $geo->distance(mile => $lon1, $lat1 => $lon2, $lat2);
=head1 DESCRIPTION
The C<Geo::Distance::XS> module provides faster C implementations of the
distance calculations found in C<Geo::Distance>. See the documentation for
that module for usage.
NOTE: As of version 0.13, Geo::Distance automatically uses this module if
it is installed.
=head1 PERFORMANCE
This distribution contains a benchmarking script which compares
C<Geo::Distance::XS> with C<Geo::Distance> and C<GIS::Distance::Fast>.
These are the results on a MacBook 2GHz with Perl 5.12.2:
---- [ Formula: hsin ] ------------------------------------
perl - distance from LA to NY: 2443.08796228363 miles
xs - distance from LA to NY: 2443.08796228363 miles
gis_fast - distance from LA to NY: 2443.08796228363 miles
Benchmark: running gis_fast, perl, xs for at least 1 CPU seconds...
gis_fast: 1 wallclock secs ( 1.06 usr + 0.01 sys = 1.07 CPU) @ 23642.99/s (n=25298)
perl: 1 wallclock secs ( 1.11 usr + 0.00 sys = 1.11 CPU) @ 77490.99/s (n=86015)
xs: 1 wallclock secs ( 1.00 usr + 0.01 sys = 1.01 CPU) @ 1238753.47/s (n=1251141)
Rate gis_fast perl xs
gis_fast 23643/s -- -69% -98%
perl 77491/s 228% -- -94%
xs 1238753/s 5139% 1499% --
---- [ Formula: polar ] ------------------------------------
perl - distance from LA to NY: 2766.02509696782 miles
xs - distance from LA to NY: 2766.02509696782 miles
gis_fast - distance from LA to NY: 2766.02509696782 miles
Benchmark: running gis_fast, perl, xs for at least 1 CPU seconds...
gis_fast: 1 wallclock secs ( 1.14 usr + -0.01 sys = 1.13 CPU) @ 19029.20/s (n=21503)
perl: 1 wallclock secs ( 1.07 usr + 0.00 sys = 1.07 CPU) @ 80387.85/s (n=86015)
xs: 2 wallclock secs ( 1.12 usr + -0.01 sys = 1.11 CPU) @ 1458670.27/s (n=1619124)
Rate gis_fast perl xs
gis_fast 19029/s -- -76% -99%
perl 80388/s 322% -- -94%
xs 1458670/s 7565% 1715% --
---- [ Formula: cos ] ------------------------------------
perl - distance from LA to NY: 2443.08796228363 miles
xs - distance from LA to NY: 2443.08796228363 miles
gis_fast - distance from LA to NY: 2443.08796228363 miles
Benchmark: running gis_fast, perl, xs for at least 1 CPU seconds...
gis_fast: 1 wallclock secs ( 1.06 usr + 0.00 sys = 1.06 CPU) @ 23866.04/s (n=25298)
perl: 1 wallclock secs ( 1.03 usr + 0.00 sys = 1.03 CPU) @ 75918.45/s (n=78196)
xs: 2 wallclock secs ( 1.07 usr + 0.01 sys = 1.08 CPU) @ 1279826.85/s (n=1382213)
Rate gis_fast perl xs
gis_fast 23866/s -- -69% -98%
perl 75918/s 218% -- -94%
xs 1279827/s 5263% 1586% --
---- [ Formula: gcd ] ------------------------------------
perl - distance from LA to NY: 12438.0476860875-9076.08896733252i miles
xs - distance from LA to NY: 2443.08796228363 miles
gis_fast - distance from LA to NY: 12438.0476860875-9076.08896733252i miles
Benchmark: running gis_fast, perl, xs for at least 1 CPU seconds...
gis_fast: 2 wallclock secs ( 1.07 usr + 0.00 sys = 1.07 CPU) @ 4185.98/s (n=4479)
perl: 1 wallclock secs ( 1.06 usr + 0.00 sys = 1.06 CPU) @ 6339.62/s (n=6720)
xs: 2 wallclock secs ( 1.05 usr + 0.00 sys = 1.05 CPU) @ 1310719.05/s (n=1376255)
Rate gis_fast perl xs
gis_fast 4186/s -- -34% -100%
perl 6340/s 51% -- -100%
xs 1310719/s 31212% 20575% --
---- [ Formula: mt ] ------------------------------------
perl - distance from LA to NY: 2443.08796228363 miles
xs - distance from LA to NY: 2443.08796228363 miles
gis_fast - distance from LA to NY: 2443.08796228363 miles
Benchmark: running gis_fast, perl, xs for at least 1 CPU seconds...
gis_fast: 1 wallclock secs ( 1.13 usr + 0.01 sys = 1.14 CPU) @ 17148.25/s (n=19549)
perl: 1 wallclock secs ( 1.07 usr + 0.01 sys = 1.08 CPU) @ 66370.37/s (n=71680)
xs: 0 wallclock secs ( 1.07 usr + 0.01 sys = 1.08 CPU) @ 1274310.19/s (n=1376255)
Rate gis_fast perl xs
gis_fast 17148/s -- -74% -99%
perl 66370/s 287% -- -95%
xs 1274310/s 7331% 1820% --
---- [ Formula: tv ] ------------------------------------
perl - distance from LA to NY: 2448.24135235512 miles
xs - distance from LA to NY: 2443.80013146211 miles
gis_fast - distance from LA to NY: 2448.24135235512 miles
Benchmark: running gis_fast, perl, xs for at least 1 CPU seconds...
gis_fast: 1 wallclock secs ( 1.05 usr + 0.01 sys = 1.06 CPU) @ 21353.77/s (n=22635)
perl: 1 wallclock secs ( 1.13 usr + 0.01 sys = 1.14 CPU) @ 15719.30/s (n=17920)
xs: 1 wallclock secs ( 1.04 usr + 0.00 sys = 1.04 CPU) @ 778425.00/s (n=809562)
Rate perl gis_fast xs
perl 15719/s -- -26% -98%
gis_fast 21354/s 36% -- -97%
xs 778425/s 4852% 3545% --
=head1 SEE ALSO
L<Geo::Distance>
=head1 REQUESTS AND BUGS
Please report any bugs or feature requests to
L<http://rt.cpan.org/Public/Bug/Report.html?Queue=Geo-Distance-XS>. I will be
notified, and then you'll automatically be notified of progress on your bug as
I make changes.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Geo::Distance::XS
You can also look for information at:
=over
=item * GitHub Source Repository
L<http://github.com/gray/geo-distance-xs>
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Geo-Distance-XS>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Geo-Distance-XS>
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/Public/Dist/Display.html?Name=Geo-Distance-XS>
=item * Search CPAN
L<http://search.cpan.org/dist/Geo-Distance-XS/>
=back
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2009-2011 gray <gray at cpan.org>, all rights reserved.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 AUTHOR
gray, <gray at cpan.org>
=cut
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