benchmarkParse.php

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<?php
require __DIR__ . '/../Maintenance.php';

use MediaWiki\MediaWikiServices;

class BenchmarkParse extends Maintenance {
    private $templateTimestamp = null;

    private $clearLinkCache = false;

    private $linkCache;

    private $idCache = [];

    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Benchmark parse operation' );
        $this->addArg( 'title', 'The name of the page to parse' );
        $this->addOption( 'warmup', 'Repeat the parse operation this number of times to warm the cache',
            false, true );
        $this->addOption( 'loops', 'Number of times to repeat parse operation post-warmup',
            false, true );
        $this->addOption( 'page-time',
            'Use the version of the page which was current at the given time',
            false, true );
        $this->addOption( 'tpl-time',
            'Use templates which were current at the given time (except that moves and ' .
            'deletes are not handled properly)',
            false, true );
        $this->addOption( 'reset-linkcache', 'Reset the LinkCache after every parse.',
            false, false );
    }

    public function execute() {
        if ( $this->hasOption( 'tpl-time' ) ) {
            $this->templateTimestamp = wfTimestamp( TS_MW, strtotime( $this->getOption( 'tpl-time' ) ) );
            Hooks::register( 'BeforeParserFetchTemplateAndtitle', [ $this, 'onFetchTemplate' ] );
        }

        $this->clearLinkCache = $this->hasOption( 'reset-linkcache' );
        // Set as a member variable to avoid function calls when we're timing the parse
        $this->linkCache = MediaWikiServices::getInstance()->getLinkCache();

        $title = Title::newFromText( $this->getArg( 0 ) );
        if ( !$title ) {
            $this->error( "Invalid title" );
            exit( 1 );
        }

        if ( $this->hasOption( 'page-time' ) ) {
            $pageTimestamp = wfTimestamp( TS_MW, strtotime( $this->getOption( 'page-time' ) ) );
            $id = $this->getRevIdForTime( $title, $pageTimestamp );
            if ( !$id ) {
                $this->error( "The page did not exist at that time" );
                exit( 1 );
            }

            $revision = Revision::newFromId( $id );
        } else {
            $revision = Revision::newFromTitle( $title );
        }

        if ( !$revision ) {
            $this->error( "Unable to load revision, incorrect title?" );
            exit( 1 );
        }

        $warmup = $this->getOption( 'warmup', 1 );
        for ( $i = 0; $i < $warmup; $i++ ) {
            $this->runParser( $revision );
        }

        $loops = $this->getOption( 'loops', 1 );
        if ( $loops < 1 ) {
            $this->fatalError( 'Invalid number of loops specified' );
        }
        $startUsage = getrusage();
        $startTime = microtime( true );
        for ( $i = 0; $i < $loops; $i++ ) {
            $this->runParser( $revision );
        }
        $endUsage = getrusage();
        $endTime = microtime( true );

        printf( "CPU time = %.3f s, wall clock time = %.3f s\n",
            // CPU time
            ( $endUsage['ru_utime.tv_sec'] + $endUsage['ru_utime.tv_usec'] * 1e-6
            - $startUsage['ru_utime.tv_sec'] - $startUsage['ru_utime.tv_usec'] * 1e-6 ) / $loops,
            // Wall clock time
            ( $endTime - $startTime ) / $loops
        );
    }

    function getRevIdForTime( Title $title, $timestamp ) {
        $dbr = $this->getDB( DB_REPLICA );

        $id = $dbr->selectField(
            [ 'revision', 'page' ],
            'rev_id',
            [
                'page_namespace' => $title->getNamespace(),
                'page_title' => $title->getDBkey(),
                'rev_timestamp <= ' . $dbr->addQuotes( $timestamp )
            ],
            __METHOD__,
            [ 'ORDER BY' => 'rev_timestamp DESC', 'LIMIT' => 1 ],
            [ 'revision' => [ 'JOIN', 'rev_page=page_id' ] ]
        );

        return $id;
    }

    function runParser( Revision $revision ) {
        $content = $revision->getContent();
        $content->getParserOutput( $revision->getTitle(), $revision->getId() );
        if ( $this->clearLinkCache ) {
            $this->linkCache->clear();
        }
    }

    function onFetchTemplate( Parser $parser, Title $title, &$skip, &$id ) {
        $pdbk = $title->getPrefixedDBkey();
        if ( !isset( $this->idCache[$pdbk] ) ) {
            $proposedId = $this->getRevIdForTime( $title, $this->templateTimestamp );
            $this->idCache[$pdbk] = $proposedId;
        }
        if ( $this->idCache[$pdbk] !== false ) {
            $id = $this->idCache[$pdbk];
        }

        return true;
    }
}

$maintClass = BenchmarkParse::class;
require RUN_MAINTENANCE_IF_MAIN;