Performance and scalability with drupal

Whenever you’re ready... Performance & Scalability with Drupal !"#$%&#()

Who the hell is this guy?• I run Wiredcraft (http://wiredcraft.com)• We build (serious) Web and mobile solutions using Open Source technologies• We work with the United Nations, CNN, Nvidia... !"#$%&#()

What’s the deal?• Drupal is; • ﬂexible & extensible • slow as hell• We want to; • deliver the content quickly to the user • optimize the use of backend resources !"#$%&#()

How do we do that?• Analyze the bottleneck• Adapt the back-end and/or front-end• Test• Repeat !"#$%&#()

Now a few advices...• Add complexity incrementally• Scale vertically ﬁrst• Focus on users not system administrators• Optimizing your code is a huge part of the equation !"#$%&#()

Analyze the bottleneck• Pimp up your shell skills• Problem: Network? Disk? CPU? Memory?• Source: Web server? App server? DB?• Caching is not magic; it adds complexity• For the long run, consider monitoring; Zabbix, Cacti, Nagios, Munin... !"#$%&#()

Web server• Clean up your conﬁguration (MPM, MaxClients, MaxRequestsPerChild, KeepAlive...)• Remove unnecessary modules• Consider switching to NGINX• Stress test (Apache Benchmark)• Scale horizontally; load balancer (HAproxy) !"#$%&#()

App server• Clean up your conﬁgurationand add slow logs if possible• Remove unnecessary modules• Consider switching to CGI; PHP-FPM or FastCGI• Add an opcode; XCache, eAccelerator or APC !"#$%&#()

Database server• Clean up your conﬁguration and add slow logs• Add caching; Memcache• Switch from MyISAM to InnoDB• Scale horizontally; Master/Slave replication !"#$%&#()

What is Pressﬂow?• Patched version of Drupalfor performance purpose• Runs Drupal.org• Only works with PHP5 and MySQL• Supports M/S replication and reverse-proxy !"#$%&#()

Other optimizations...• Views caching• Block caching (Block Cache Alter module)• Reverse proxy (Varnish) or ﬁle caching (Boost)• Add a full text search engine; Solr, Sphinx, Elastic Search... Plenty of modules; Search API module, Searchlight... !"#$%&#()

And then some more• Authenticated caching; much more complex (AuthCache module)• More core patches; http:// tag1consulting.com/patches• Denormalize your tables (Materialized View API) if you’re on ﬁre !"#$%&#()

Now the real big thing• The biggest bottleneck: the code• Too many modules (feature creep)• Poor code, slow queries• “Bad” modules usually results from “bad” engineering !"#$%&#()

Find out the culprit• Slow query logs (MySQL)• Slow script logs (PHP-FPM)• Code Proﬁling; XHProf, XDebug• Testingthe good old “disable and load the page” !"#$%&#()

Dealing with the situation• Buy some time: • Quick wins; Opcode, Memcache • Switch to NGINX+PHP-FPM • Cleanup your conﬁguration • Cache anonymous traffic (Boost or Varnish)• Clean up the mess !"#$%&#()

Next step; front-end• Complete separate topic; • CSS/JS aggregation, • parallelization & CDN, • Gzip compression, • sprites & image optimization...• Code also matters here: optimize! !"#$%&#()

Questions?Go easy on me though, I’m sick today... !"#$%&#()

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Performance and scalability with drupal

by Ronan Berder

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