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<?php
/**
* Benchmark for CDN purge.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Benchmark
*/
use MediaWiki\Deferred\CdnCacheUpdate;
use MediaWiki\Maintenance\Benchmarker;
// @codeCoverageIgnoreStart
require_once __DIR__ . '/../includes/Benchmarker.php';
// @codeCoverageIgnoreEnd
/**
* Maintenance script that benchmarks CDN purge.
*
* @ingroup Benchmark
*/
class BenchmarkPurge extends Benchmarker {
public function __construct() {
parent::__construct();
$this->addDescription( 'Benchmark the CDN purge functions.' );
}
public function execute() {
global $wgUseCdn, $wgCdnServers;
if ( !$wgUseCdn ) {
$this->error( "CDN purge benchmark doesn't do much without CDN support on." );
} else {
$this->output( "There are " . count( $wgCdnServers ) . " defined CDN servers:\n" );
if ( $this->hasOption( 'count' ) ) {
$lengths = [ intval( $this->getOption( 'count' ) ) ];
} else {
$lengths = [ 1, 10, 100 ];
}
foreach ( $lengths as $length ) {
$urls = $this->randomUrlList( $length );
$trial = $this->benchCdn( $urls );
$this->output( $trial . "\n" );
}
}
}
/**
* Run a bunch of URLs through CdnCacheUpdate::purge()
* to benchmark CDN response times.
* @param array $urls A bunch of URLs to purge
* @param int $trials How many times to run the test?
* @return string
*/
private function benchCdn( $urls, $trials = 1 ) {
$start = microtime( true );
for ( $i = 0; $i < $trials; $i++ ) {
CdnCacheUpdate::purge( $urls );
}
$delta = microtime( true ) - $start;
$pertrial = $delta / $trials;
$pertitle = $pertrial / count( $urls );
return sprintf( "%4d titles in %6.2fms (%6.2fms each)",
count( $urls ), $pertrial * 1000.0, $pertitle * 1000.0 );
}
/**
* Get an array of randomUrl()'s.
* @param int $length How many urls to add to the array
* @return array
*/
private function randomUrlList( $length ) {
$list = [];
for ( $i = 0; $i < $length; $i++ ) {
$list[] = $this->randomUrl();
}
return $list;
}
/**
* Return a random URL of the wiki. Not necessarily an actual title in the
* database, but at least a URL that looks like one.
* @return string
*/
private function randomUrl() {
global $wgServer, $wgArticlePath;
return $wgServer . str_replace( '$1', $this->randomTitle(), $wgArticlePath );
}
/**
* Create a random title string (not necessarily a Title object).
* For use with randomUrl().
* @return string
*/
private function randomTitle() {
$str = '';
$length = mt_rand( 1, 20 );
for ( $i = 0; $i < $length; $i++ ) {
$str .= chr( mt_rand( ord( 'a' ), ord( 'z' ) ) );
}
return ucfirst( $str );
}
}
// @codeCoverageIgnoreStart
$maintClass = BenchmarkPurge::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd