From: Tim Starling <tstarling@users.mediawiki.org>
Date: Thu, 3 Dec 2009 05:38:32 +0000 (+0000)
Subject: Merged r56967 from wmf-deployment: for performance, don't consider pages with very... 
X-Git-Tag: 1.31.0-rc.0~38646
X-Git-Url: http://git.cyclocoop.org/%24action?a=commitdiff_plain;h=37ae1ca3f97ea2eab528a04084658ee729de7a45;p=lhc%2Fweb%2Fwiklou.git

Merged r56967 from wmf-deployment: for performance, don't consider pages with very few links for Special:Mostlinked.

Implemented a page count threshold as Domas suggested in his commit message. A fractional power seems to make sense for scaling from page count to links-per-page, since it has the right kind of limits, so I used a square root bounded between 1 and 100.
---

diff --git a/includes/specials/SpecialMostlinked.php b/includes/specials/SpecialMostlinked.php
index e8d1bcddd8..173015997b 100644
--- a/includes/specials/SpecialMostlinked.php
+++ b/includes/specials/SpecialMostlinked.php
@@ -23,7 +23,24 @@ class MostlinkedPage extends QueryPage {
 	function isSyndicated() { return false; }
 
 	function getSQL() {
+		global $wgMiserMode;
+
 		$dbr = wfGetDB( DB_SLAVE );
+
+		# In miser mode, reduce the query cost by adding a threshold for large wikis
+		if ( $wgMiserMode ) {
+			$numPages = SiteStats::pages();
+			if ( $numPages > 10000 ) {
+				$cutoff = 100;
+			} elseif ( $numPages > 100 ) {
+				$cutoff = intval( sqrt( $numPages ) );
+			} else {
+				$cutoff = 1;
+			}
+		} else {
+			$cutoff = 1;
+		}
+
 		list( $pagelinks, $page ) = $dbr->tableNamesN( 'pagelinks', 'page' );
 		return
 			"SELECT 'Mostlinked' AS type,
@@ -33,7 +50,7 @@ class MostlinkedPage extends QueryPage {
 			FROM $pagelinks
 			LEFT JOIN $page ON pl_namespace=page_namespace AND pl_title=page_title
 			GROUP BY pl_namespace, pl_title
-			HAVING COUNT(*) > 1";
+			HAVING COUNT(*) > $cutoff";
 	}
 
 	/**