maintenance/benchmarks/benchmarkPurge.php

   1 <?php
   2 /**
   3  * Benchmark for CDN purge.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Benchmark
  22  */
  23
  24 require_once __DIR__ . '/Benchmarker.php';
  25
  26 /**
  27  * Maintenance script that benchmarks CDN purge.
  28  *
  29  * @ingroup Benchmark
  30  */
  31 class BenchmarkPurge extends Benchmarker {
  32         public function __construct() {
  33                 parent::__construct();
  34                 $this->addDescription( 'Benchmark the CDN purge functions.' );
  35         }
  36
  37         public function execute() {
  38                 global $wgUseCdn, $wgCdnServers;
  39
  40                 if ( !$wgUseCdn ) {
  41                         $this->error( "CDN purge benchmark doesn't do much without CDN support on." );
  42                 } else {
  43                         $this->output( "There are " . count( $wgCdnServers ) . " defined CDN servers:\n" );
  44                         if ( $this->hasOption( 'count' ) ) {
  45                                 $lengths = [ intval( $this->getOption( 'count' ) ) ];
  46                         } else {
  47                                 $lengths = [ 1, 10, 100 ];
  48                         }
  49                         foreach ( $lengths as $length ) {
  50                                 $urls = $this->randomUrlList( $length );
  51                                 $trial = $this->benchCdn( $urls );
  52                                 $this->output( $trial . "\n" );
  53                         }
  54                 }
  55         }
  56
  57         /**
  58          * Run a bunch of URLs through CdnCacheUpdate::purge()
  59          * to benchmark CDN response times.
  60          * @param array $urls A bunch of URLs to purge
  61          * @param int $trials How many times to run the test?
  62          * @return string
  63          */
  64         private function benchCdn( $urls, $trials = 1 ) {
  65                 $start = microtime( true );
  66                 for ( $i = 0; $i < $trials; $i++ ) {
  67                         CdnCacheUpdate::purge( $urls );
  68                 }
  69                 $delta = microtime( true ) - $start;
  70                 $pertrial = $delta / $trials;
  71                 $pertitle = $pertrial / count( $urls );
  72
  73                 return sprintf( "%4d titles in %6.2fms (%6.2fms each)",
  74                         count( $urls ), $pertrial * 1000.0, $pertitle * 1000.0 );
  75         }
  76
  77         /**
  78          * Get an array of randomUrl()'s.
  79          * @param int $length How many urls to add to the array
  80          * @return array
  81          */
  82         private function randomUrlList( $length ) {
  83                 $list = [];
  84                 for ( $i = 0; $i < $length; $i++ ) {
  85                         $list[] = $this->randomUrl();
  86                 }
  87
  88                 return $list;
  89         }
  90
  91         /**
  92          * Return a random URL of the wiki. Not necessarily an actual title in the
  93          * database, but at least a URL that looks like one.
  94          * @return string
  95          */
  96         private function randomUrl() {
  97                 global $wgServer, $wgArticlePath;
  98
  99                 return $wgServer . str_replace( '$1', $this->randomTitle(), $wgArticlePath );
 100         }
 101
 102         /**
 103          * Create a random title string (not necessarily a Title object).
 104          * For use with randomUrl().
 105          * @return string
 106          */
 107         private function randomTitle() {
 108                 $str = '';
 109                 $length = mt_rand( 1, 20 );
 110                 for ( $i = 0; $i < $length; $i++ ) {
 111                         $str .= chr( mt_rand( ord( 'a' ), ord( 'z' ) ) );
 112                 }
 113
 114                 return ucfirst( $str );
 115         }
 116 }
 117
 118 $maintClass = BenchmarkPurge::class;
 119 require_once RUN_MAINTENANCE_IF_MAIN;