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   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->mDescription = "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 = array( intval( $this->getOption( 'count' ) ) );
  45              } else {
  46                  $lengths = array( 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              SquidUpdate::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 = array();
  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;