maintenance/benchmarks/benchmarkPurge.php

   1 <?php
   2 /**
   3  * Benchmark for Squid 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 Squid purge.
  28  *
  29  * @ingroup Benchmark
  30  */
  31 class BenchmarkPurge extends Benchmarker {
  32         public function __construct() {
  33                 parent::__construct();
  34                 $this->addDescription( 'Benchmark the Squid purge functions.' );
  35         }
  36
  37         public function execute() {
  38                 global $wgUseSquid, $wgSquidServers;
  39                 if ( !$wgUseSquid ) {
  40                         $this->error( "Squid purge benchmark doesn't do much without squid support on.", true );
  41                 } else {
  42                         $this->output( "There are " . count( $wgSquidServers ) . " defined squid servers:\n" );
  43                         if ( $this->hasOption( 'count' ) ) {
  44                                 $lengths = [ intval( $this->getOption( 'count' ) ) ];
  45                         } else {
  46                                 $lengths = [ 1, 10, 100 ];
  47                         }
  48                         foreach ( $lengths as $length ) {
  49                                 $urls = $this->randomUrlList( $length );
  50                                 $trial = $this->benchSquid( $urls );
  51                                 $this->output( $trial . "\n" );
  52                         }
  53                 }
  54         }
  55
  56         /**
  57          * Run a bunch of URLs through SquidUpdate::purge()
  58          * to benchmark Squid response times.
  59          * @param array $urls A bunch of URLs to purge
  60          * @param int $trials How many times to run the test?
  61          * @return string
  62          */
  63         private function benchSquid( $urls, $trials = 1 ) {
  64                 $start = microtime( true );
  65                 for ( $i = 0; $i < $trials; $i++ ) {
  66                         CdnCacheUpdate::purge( $urls );
  67                 }
  68                 $delta = microtime( true ) - $start;
  69                 $pertrial = $delta / $trials;
  70                 $pertitle = $pertrial / count( $urls );
  71
  72                 return sprintf( "%4d titles in %6.2fms (%6.2fms each)",
  73                         count( $urls ), $pertrial * 1000.0, $pertitle * 1000.0 );
  74         }
  75
  76         /**
  77          * Get an array of randomUrl()'s.
  78          * @param int $length How many urls to add to the array
  79          * @return array
  80          */
  81         private function randomUrlList( $length ) {
  82                 $list = [];
  83                 for ( $i = 0; $i < $length; $i++ ) {
  84                         $list[] = $this->randomUrl();
  85                 }
  86
  87                 return $list;
  88         }
  89
  90         /**
  91          * Return a random URL of the wiki. Not necessarily an actual title in the
  92          * database, but at least a URL that looks like one.
  93          * @return string
  94          */
  95         private function randomUrl() {
  96                 global $wgServer, $wgArticlePath;
  97
  98                 return $wgServer . str_replace( '$1', $this->randomTitle(), $wgArticlePath );
  99         }
 100
 101         /**
 102          * Create a random title string (not necessarily a Title object).
 103          * For use with randomUrl().
 104          * @return string
 105          */
 106         private function randomTitle() {
 107                 $str = '';
 108                 $length = mt_rand( 1, 20 );
 109                 for ( $i = 0; $i < $length; $i++ ) {
 110                         $str .= chr( mt_rand( ord( 'a' ), ord( 'z' ) ) );
 111                 }
 112
 113                 return ucfirst( $str );
 114         }
 115 }
 116
 117 $maintClass = "BenchmarkPurge";
 118 require_once RUN_MAINTENANCE_IF_MAIN;