From: Timo Tijhof <krinklemail@gmail.com>
Date: Wed, 28 Sep 2016 20:37:20 +0000 (+0100)
Subject: resourceloader: Disable ChronologyProtector to speed up wfGetLB()
X-Git-Tag: 1.31.0-rc.0~5283^2
X-Git-Url: https://git.cyclocoop.org/admin/%7B%24plugin.url%7Cescape%7D?a=commitdiff_plain;h=98c6743413118f658a214f2c2829b15d519fecdc;p=lhc%2Fweb%2Fwiklou.git

resourceloader: Disable ChronologyProtector to speed up wfGetLB()

For load.php requests, Xenon in Wikimedia production measures that half
the time for wfGetLB() is spent in ChronologyProtector::initPositions,
and its query to Memcached.

Change-Id: I24f90897e56fd679c6bd1acf764722ed58e51c67
---

diff --git a/load.php b/load.php
index c832237059..974771f978 100644
--- a/load.php
+++ b/load.php
@@ -23,6 +23,7 @@
  */
 
 use MediaWiki\Logger\LoggerFactory;
+use MediaWiki\MediaWikiServices;
 
 // This endpoint is supposed to be independent of request cookies and other
 // details of the session. Enforce this constraint with respect to session use.
@@ -35,6 +36,12 @@ if ( !$wgRequest->checkUrlExtension() ) {
 	return;
 }
 
+// Don't initialise ChronologyProtector from object cache, and
+// don't wait for unrelated MediaWiki writes when querying ResourceLoader.
+MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->setRequestInfo( [
+	'ChronologyProtection' => 'false',
+] );
+
 // Set up ResourceLoader
 $resourceLoader = new ResourceLoader(
 	ConfigFactory::getDefaultInstance()->makeConfig( 'main' ),