Last modified: 2014-06-23 16:07:00 UTC
From http://www.mediawiki.org/wiki/Thread:Project:Support_desk/Why_does_MediaWiki_try_to_create_the_same_thumbnail_multiple_times%3F During one single request, MediaWiki tries to create one and the same thumbnail multiple times. This error happens, when it is not actually needed at all to create a thumbnail. <b>How to reproduce:</b> Create a page with this wiki text: [[File:Image.png]] Image.png must have a size, which can be rendered without any resizing. E.g. in my case it has 450x151 pixels. <b>Actual result:</b> When viewing the uncached page, MediaWiki <i>several times</i> tries to create a thumbnail with exactly the size of the original image. Debug output: <pre> Start request GET /Main_Page ... Pulling file metadata from cache key wiki:file:8866e45e917553a7dbb1198218cfa928 MimeMagic::__construct: loading mime types from /www/wiki/includes/mime.types MimeMagic::__construct: loading mime info from /www/wiki/includes/mime.info File::transform: Doing stat for mwstore://local-backend/local-thumb/8/88/Image.png/450px-Image.png FileBackendStore::getFileStat: File mwstore://local-backend/local-thumb/8/88/Image.png/450px-Image.png does not exist. BitmapHandler::doTransform: creating 450x151 thumbnail at /tmp//transform_64c4649d3b12-1.png using scaler im BitmapHandler::doTransform: returning unscaled image File::transform: Doing stat for mwstore://local-backend/local-thumb/8/88/Image.png/450px-Image.png BitmapHandler::doTransform: creating 450x151 thumbnail at /tmp//transform_40e462b65414-1.png using scaler im BitmapHandler::doTransform: returning unscaled image File::transform: Doing stat for mwstore://local-backend/local-thumb/8/88/Image.png/450px-Image.png BitmapHandler::doTransform: creating 450x151 thumbnail at /tmp//transform_341bb62f6727-1.png using scaler im BitmapHandler::doTransform: returning unscaled image </pre> <b>Expected result:</b> 1. MediaWiki should recognize that it is not necessary to create a thumbnail in this size, as the thumbnail would have exactly the size of the original image. 2. MediaWiki should only try to create the thumbnail ONE time, not three times.
