lag.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class DatabaseLag extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Shows database lag";
                $this->addOption( 'r', "Don't exit immediately, but show the lag every 5 seconds" );
        }

        public function execute() {
                if ( $this->hasOption( 'r' ) ) {
                        $lb = wfGetLB();
                        echo 'time     ';
                        for ( $i = 1; $i < $lb->getServerCount(); $i++ ) {
                                $hostname = $lb->getServerName( $i );
                                printf( "%-12s ", $hostname );
                        }
                        echo "\n";

                        while ( 1 ) {
                                $lb->clearLagTimeCache();
                                $lags = $lb->getLagTimes();
                                unset( $lags[0] );
                                echo gmdate( 'H:i:s' ) . ' ';
                                foreach ( $lags as $lag ) {
                                        printf( "%-12s ", $lag === false ? 'false' : $lag );
                                }
                                echo "\n";
                                sleep( 5 );
                        }
                } else {
                        $lb = wfGetLB();
                        $lags = $lb->getLagTimes();
                        foreach ( $lags as $i => $lag ) {
                                $name = $lb->getServerName( $i );
                                $this->output( sprintf( "%-20s %s\n", $name, $lag === false ? 'false' : $lag ) );
                        }
                }
        }
}

$maintClass = "DatabaseLag";
require_once( RUN_MAINTENANCE_IF_MAIN );