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Scaling WordPress
- 4. Reading on WordPress.com Over 372 million people view more than 4.1 billion pages each month. http://en.wordpress.com/stats/
- 5. Publishing on WordPress.com about 49.3 million new posts and 50.7 million new comments each month http://en.wordpress.com/stats/
- 7. Start Small
- 9. Layers Network Server Hardware Operating System HTTP PHP MySQL
- 10. Layers Network Server Hardware Operating System HTTP PHP MySQL WordPress
- 11. Layers Network Server Hardware Operating System HTTP PHP MySQL WordPress
- 12. HTTP - Apache ‣Remove unused modules ‣Turn off host name lookups ‣Turn off .htaccess ‣Turn on compression ‣Tweak MaxClients
- 14. PHP ๏ Use an opcode cache ( APC, Zend Opcache ) ๏ Use newer versions ๏ Don’t use on static files ๏ Be careful with preg_* functions ๏ Profile your code ( Xdebug,VLD, XHProf ) ๏ Don’t re-invent native PHP functions
- 15. MySQL ๏ Use InnoDB, unless you have a good reason not to ๏ Use the slow query log ๏ Use EXPLAIN on queries, learn what the output means ๏ Double Triple check your indexes ๏ Learn about quirks
- 16. MySQL Not Just MySQL Any More
- 17. MySQL
- 18. WordPress ๏Turn off unused plugins ๏ Use a caching plugin ๏ Carefully vet themes and plugins they have great powers ๏ Profile real life performance
- 20. Track Performance Forget about averages
- 21. Track Performance Forget about averages Averages Lie!
- 22. Track Performance “Thinking Clearly About Performance” - Cary Millsap http://method-r.com/downloads/doc_details/44-thinking- clearly-about-performance
- 25. First, KnowYour Limits Determine the theoretical best performance for your setup
- 26. First, KnowYour Limits Determine the theoretical best performance for your setup What ever you come up with will be slower than that
- 27. Less Work > More Work
- 28. PHP - opcode caching Read Parse Compile Execute Output .php
- 29. PHP - opcode caching Read Parse Compile Execute Output .php APC Opcode Cache
- 30. PHP - opcode caching Reduce time per request by 4x Increase requests per second by 4x
- 31. Less work, for the same result means more capacity
- 32. Memcached Key /Value data storage In memory only, won’t survive a reboot http://memcached.org/
- 33. WordPress + Memcached WordPress Object Cache, reduces the number of database queries http://wordpress.org/extend/plugins/memcached/
- 35. WordPress + Memcached + Batcache Stores & serve fully rendered pages in Memcached http://wordpress.org/extend/plugins/batcache/
- 39. Servers But my one database server still can’t keep up
- 40. MySQL Replication Master / Slave ๏ One way, asynchronous ๏Writes to the master ๏ Reads to the slave ๏ Multiple slaves & chaining
- 41. WordPress + HyperDB Makes WordPress aware of MySQL replication http://wordpress.org/extend/plugins/hyperdb/
- 42. WordPress + HyperDB ๏ Read & write servers ๏ Priority for reads & writes ๏ Local and remote data centers ๏ Private and public networks ๏ Per table granularity ๏ Smart post-write master reads
- 44. MySQL Replication Other Uses ๏ Slave just for backups ๏ Multiple data centers ๏Task specific web servers
- 46. Servers Imagine all of that with: ๏ Multiple load balancers ๏ Multiple networks ( public / private ) ๏ Multiple data centers
- 47. One More Thing
- 48. Asynchronous Jobs Queue Lots of options We built one for WordPress.com
- 49. Asynchronous Jobs Queue http://code.trac.wordpress.org/browser/jobs http://code.trac.wordpress.org/wiki/JobsDocs All PHP + MySQL
- 50. Asynchronous Jobs Queue Good for anything that isn’t required for rendering a page
- 51. Questions?