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  * @ingroup Maintenance
  21  */
  22
  23 require_once( dirname(__FILE__) . '/Maintenance.php' );
  24
  25 class BenchmarkPurge extends Maintenance {
  26
  27         public function __construct() {
  28                 parent::__construct();
  29                 $this->addOption( "count", "How many URLs to feed to Squid for purging", false, true );
  30                 $this->mDescription = "Benchmark the Squid purge functions.";
  31         }
  32
  33         public function execute() {
  34                 global $wgUseSquid;
  35                 if( !$wgUseSquid ) {
  36                         $this->error( "Squid purge benchmark doesn't do much without squid support on.". true );
  37                 } else {
  38                         $this->output( "There are " . count( $wgSquidServers ) . " defined squid servers:\n" );
  39                         if( $this->hasOption( 'count' ) ) {
  40                                 $lengths = array( intval( $this->getOption('count') ) );
  41                         } else {
  42                                 $lengths = array( 1, 10, 100 );
  43                         }
  44                         foreach( $lengths as $length ) {
  45                                 $urls = $this->randomUrlList( $length );
  46                                 $trial = $this->benchSquid( $urls );
  47                                 $this->output( $trial . "\n" );
  48                         }
  49                 }
  50         }
  51
  52         /**
  53          * Run a bunch of URLs through SquidUpdate::purge()
  54          * to benchmark Squid response times.
  55          * @param $urls array A bunch of URLs to purge
  56          * @param $trials int How many times to run the test?
  57          */
  58         private function benchSquid( $urls, $trials = 1 ) {
  59                 $start = wfTime();
  60                 for( $i = 0; $i < $trials; $i++) {
  61                         SquidUpdate::purge( $urls );
  62                 }
  63                 $delta = wfTime() - $start;
  64                 $pertrial = $delta / $trials;
  65                 $pertitle = $pertrial / count( $urls );
  66                 return sprintf( "%4d titles in %6.2fms (%6.2fms each)",
  67                         count( $urls ), $pertrial * 1000.0, $pertitle * 1000.0 );
  68         }
  69
  70         /**
  71          * Get an array of randomUrl()'s.
  72          * @param $length int How many urls to add to the array
  73          */
  74         private function randomUrlList( $length ) {
  75                 $list = array();
  76                 for( $i = 0; $i < $length; $i++ ) {
  77                         $list[] = $this->randomUrl();
  78                 }
  79                 return $list;
  80         }
  81
  82         /**
  83          * Return a random URL of the wiki. Not necessarily an actual title in the
  84          * database, but at least a URL that looks like one.
  85          */
  86         private function randomUrl() {
  87                 global $wgServer, $wgArticlePath;
  88                 return $wgServer . str_replace( '$1', $this->randomTitle(), $wgArticlePath );
  89         }
  90
  91         /**
  92          * Create a random title string (not necessarily a Title object).
  93          * For use with randomUrl().
  94          */
  95         private function randomTitle() {
  96                 $str = '';
  97                 $length = mt_rand( 1, 20 );
  98                 for( $i = 0; $i < $length; $i++ ) {
  99                         $str .= chr( mt_rand( ord('a'), ord('z') ) );
 100                 }
 101                 return ucfirst( $str );
 102         }
 103 }
 104
 105 $maintClass = "BenchmarkPurge";
 106 require_once( DO_MAINTENANCE );