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Drupal Cache Luis F. Ribeiro Ci&T Inc. 2013 Introduction Caio - PowerPoint PPT Presentation

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The importance of Drupal Cache Luis F. Ribeiro Ci&T Inc. 2013 Introduction Caio Ciao Luppi Software Architect at Ci&T Inc. More than 4 years of experience with Drupal Development Experience with Application Development

  1. The importance of Drupal Cache Luis F. Ribeiro Ci&T Inc. 2013

  2. Introduction • Caio Ciao Luppi • Software Architect at Ci&T Inc. • More than 4 years of experience with Drupal Development • Experience with Application Development and Support using Drupal 6 and Drupal 7 Platforms 2 www.ciandt.com

  3. Ci&T Inc. 3 www.ciandt.com

  4. Why use Cache ? ● Faster response time will increase the user experience ● Optimizing / rewriting code is often expensive or not an option ● Lower data center costs ● Reduce the CMS Workflow overhead 4 www.ciandt.com

  5. Why use Cache ? 5 www.ciandt.com

  6. Cache Options Drupal Modules/Distros - Page Cache - Boost Cache - Authenthicated Cache - PressFlow Other Cache Options - Varnish - APC - CDN (Akamai, Amazon CloudFront, Level 3) - Memcache 6 www.ciandt.com

  7. Page Cache - Out of the box Drupal page caching mechanism - Saves rendered pages directly into the database - By default only caches anonymous requests - Hook_boot and hook_exit are always called – unless you’re using the aggressive cache option 7 www.ciandt.com

  8. Memcache ● High-performance, distributed memory object caching system ● Reduces database hits ● Cached data is stored in web server memory ● It works awesomely if the database is in a different server 8 www.ciandt.com

  9. Memcache 9 www.ciandt.com

  10. Memcache – Install High-level steps to install memcache 1. Install memcached daemon 2. Install and configure PHP memcache extension 3. Install and enable memcache Drupal module 4. Configure Drupal to use memcache 10 www.ciandt.com

  11. Boost - Module solution that provides static page caching - Signifcant performance improvement for unauthenticated traffic - Supports shared, VPS and dedicated hosting - Requires cron & clean urls to work properly - Have to edit .htaccess and robots.txt files 11 www.ciandt.com

  12. Boost - Flow 12 www.ciandt.com

  13. Authenticated User Page Caching (Authcache) - Most popular solution for authenticated caching - Caches final rendered HTML per role and makes AJAX calls to get user specific content - Ability to use different types of caching (database, memcache, etc...) 13 www.ciandt.com

  14. Authcache Flow 14 www.ciandt.com

  15. Authcache Disadvantages - Requires changes on how user-customized content is displayed - Increases development time and testing - Not suited for heavy user-centric content - Hooks for contributed modules may need to be added for compatibility 15 www.ciandt.com

  16. PressFlow - Drupal distribution with integrated performance, scalability and availability enhancements - Drupal 6 and Drupal 7 versions - Provides integration with Varnish and allows for MySQL replication - The key enhancements from Pressflow 6 were added to Drupal 7. 16 www.ciandt.com

  17. Varnish 17 www.ciandt.com

  18. Varnish - HTTP reverse proxy solution - Default caching solution used at Acquia servers - Focused exclusively on HTTP, unlike other proxy servers that often support FTP, SMTP, etc - Supports load balancing 18 www.ciandt.com

  19. CDN – Content Delivery Network - Geographically distributed servers - Delivers the fastest possible download for all users based on location - Focused on files (resources) referenced by the HTML, such as CSS, JavaScript, fonts and images - Free CDNs : CloudFlare, Coral Content Distribution Network - Commercial CDNs : Akamai Technologies, Amazon CloudFront, Level 3 Communications, etc 19 www.ciandt.com

  20. What if we use them all… 20 www.ciandt.com

  21. Cache ~20ms ~100ms ~200ms ~600ms ~2000ms 21 www.ciandt.com

  22. Front-end Improvements • Sprites • Compressing images • Minify and aggregate JS and CSS files • Using tool that will help you to analyze and improve front-end performance (YSlow, Web Page Analyzer, Firebug, etc) 22 www.ciandt.com

  23. Benchmarking / Load Test • Load testing tools • Loadrunner • Jmeter • Etc… • Analyze results • Response Time • Throughput 23 www.ciandt.com

  24. Load Test – CDN & Page Cache Example 50s BEFORE 0 to 500 Vusers 13s 0 to 500 Vusers AFTER www.ciandt.com

  25. Load Test – CDN & Page Cache Example 4,500,000 BEFORE 9,500,000 AFTER 25 www.ciandt.com

  26. Problems / Risks • Authenticated users • Caching what’s not supposed to be cached • Dynamic/random content • Personalized content • Etc… • Actual content and cache can be out of sync 26 www.ciandt.com

  27. What to do when nothing works… www.ciandt.com

  28. Troubleshooting • Clear cache (Drupal, Varnish, CDN, etc…) and try again • Force a new request using random query strings (?asdasdasd) • Disable cache for authenticated users • Use helper tools/modules/modes (debug mode, memcache interface, etc…) 28 www.ciandt.com

  29. Questions? Questions? 29 www.ciandt.com

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