maintenance/benchmarkPurge.php

   1 <?php
   2 /**
   3  * Squid purge benchmark script
   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 Maintenance
  22  */
  23
  24 require_once( dirname( __FILE__ ) . '/Maintenance.php' );
  25
  26 class BenchmarkPurge extends Maintenance {
  27
  28         public function __construct() {
  29                 parent::__construct();
  30                 $this->addOption( "count", "How many URLs to feed to Squid for purging", false, true );
  31                 $this->mDescription = "Benchmark the Squid purge functions.";
  32         }
  33
  34         public function execute() {
  35                 global $wgUseSquid, $wgSquidServers;
  36                 if ( !$wgUseSquid ) {
  37                         $this->error( "Squid purge benchmark doesn't do much without squid support on." . true );
  38                 } else {
  39                         $this->output( "There are " . count( $wgSquidServers ) . " defined squid servers:\n" );
  40                         if ( $this->hasOption( 'count' ) ) {
  41                                 $lengths = array( intval( $this->getOption( 'count' ) ) );
  42                         } else {
  43                                 $lengths = array( 1, 10, 100 );
  44                         }
  45                         foreach ( $lengths as $length ) {
  46                                 $urls = $this->randomUrlList( $length );
  47                                 $trial = $this->benchSquid( $urls );
  48                                 $this->output( $trial . "\n" );
  49                         }
  50                 }
  51         }
  52
  53         /**
  54          * Run a bunch of URLs through SquidUpdate::purge()
  55          * to benchmark Squid response times.
  56          * @param $urls array A bunch of URLs to purge
  57          * @param $trials int How many times to run the test?
  58          */
  59         private function benchSquid( $urls, $trials = 1 ) {
  60                 $start = wfTime();
  61                 for ( $i = 0; $i < $trials; $i++ ) {
  62                         SquidUpdate::purge( $urls );
  63                 }
  64                 $delta = wfTime() - $start;
  65                 $pertrial = $delta / $trials;
  66                 $pertitle = $pertrial / count( $urls );
  67                 return sprintf( "%4d titles in %6.2fms (%6.2fms each)",
  68                         count( $urls ), $pertrial * 1000.0, $pertitle * 1000.0 );
  69         }
  70
  71         /**
  72          * Get an array of randomUrl()'s.
  73          * @param $length int How many urls to add to the array
  74          */
  75         private function randomUrlList( $length ) {
  76                 $list = array();
  77                 for ( $i = 0; $i < $length; $i++ ) {
  78                         $list[] = $this->randomUrl();
  79                 }
  80                 return $list;
  81         }
  82
  83         /**
  84          * Return a random URL of the wiki. Not necessarily an actual title in the
  85          * database, but at least a URL that looks like one.
  86          */
  87         private function randomUrl() {
  88                 global $wgServer, $wgArticlePath;
  89                 return $wgServer . str_replace( '$1', $this->randomTitle(), $wgArticlePath );
  90         }
  91
  92         /**
  93          * Create a random title string (not necessarily a Title object).
  94          * For use with randomUrl().
  95          */
  96         private function randomTitle() {
  97                 $str = '';
  98                 $length = mt_rand( 1, 20 );
  99                 for ( $i = 0; $i < $length; $i++ ) {
 100                         $str .= chr( mt_rand( ord( 'a' ), ord( 'z' ) ) );
 101                 }
 102                 return ucfirst( $str );
 103         }
 104 }
 105
 106 $maintClass = "BenchmarkPurge";
 107 require_once( DO_MAINTENANCE );