According to the company, as of August 2009[update] Flickr is hosted on 62 databases across 124 servers, with about 800,000 user accounts per pair of servers.[57] Based on information compiled by highscalability.com, as of November 2007[update] the MySQL databases are hosted on servers that are Linux-based (from Red Hat), with a software platform that includes Apache, PHP (with PEAR and Smarty), shards, Memcached, Squid, Perl, ImageMagick and Java; the system administration tools include Ganglia, SystemImager, Subcon and CVSup.[58]