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Rationally boost your symfony2 application with caching tips and monitoring


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Turin SymfonyDay, 5th October 2012 by @liuggio - I will try to keep the tips updated, I suggest you put this talk to your favorites. - Any comment or feedback are really appreciated.

Published in: Technology

Rationally boost your symfony2 application with caching tips and monitoring

  3. 3. Cache Optimization tips SymfonyMonitoring Scaling Application
  4. 4. Cache Optimization tips SymfonyMonitoring Scaling Application Rationality
  5. 5. Cache Optimization tips SymfonyMonitoring Scaling Application
  6. 6. What do you think if I say Cache _(disambiguation)? esi google Cookie vary shared cache proxy cache APCEtag cache Invalidation bytecode cache fresh/stale Memcache(d) Cookie esi fresh/stale Pipeline clear APC CPU cache Cache hit/miss vary Etag burstdisk cachegoogle APC Etag CPU cache cache cachecache vary DNS Cache google cache fresh/stale shared cache CPU cache Etag Redis CPU cache esi proxy Expiration Cookie cache.manifest html5 esi cache disk cache proxy DNS Cache vary Memcache(d) CPU cache esi APC disk cache vary cache bytecode cache shared cache
  7. 7. “Great caching is like great sex.It hides all the real problems”Vivek Haldar
  8. 8. Cache_(disambiguation)Wikipedia: “a Cache ( /’kæ∫/ KASH[1]) is a component thattransparently stores data so that future requests for that data can beserved faster.”A Cache Hit happens if the Cache contains the answer.A Cache Miss happens if the Cache doesn’t contain the answer.The perfect Cache - definitionA Cache is perfect when given the same request the Cachemiss happens once. || given the same request the response isnot ‘processed’ twice.A Cache is perfect when the Cache miss happens once for thesame response.
  9. 9. Cache The Cache is a matter of response
  10. 10. Cache && Symfony 2 — Application caching: app/cache and APC — Response caching and HTTP-CACHE — Doctrine2 Query and Result Caching — CDN and static files — Other
  11. 11. Cache && Symfony 2 — app/cacheTerravison vendor folder is about 340 MBThe app/cache/prod folder is about 3000 files 1. Annotation (Entity/Controller/...) 2. Template a. name => file b. twig in php 3. Assetic (definition) 4. Url matcher, Url creator 5. Translations array key=>value 6. Doctrine Entity Proxy 7. Your Bundle!
  12. 12. Cache && Symfony 2 — app/cacheBuild your own CacheWarmernamespace SymfonyComponentHttpKernelCacheWarmer;interface CacheWarmerInterface /** * Warms up the cache. * @param string $cacheDir The cache directory */ public function warmUp($cacheDir); public function isOptional()Add your class to the services with the tag kernel.cache_warmerNote: the CacheWarmerInterface is not properly the same as the snippet.
  13. 13. Cache && Symfony2 — HTTP is a web framework built from scratch aroundthe http specification — a resource could be Fresh || Stale — http-caching only on safe method — validation || expiration
  14. 14. Cache && Symfony 2 — HTTP CACHE Real world example Reverse Proxy Shared Cache Cache Browser Private Shared Cache Shared CacheClient Server
  15. 15. Cache && Symfony 2 — HTTP$response->setPublic() //default is private$response->setMaxAge(600);// Same as above but only for shared caches$response->setSharedMaxAge(600);$response->setETag(md5($response->getContent()));$response->setLastModified($datetime);if ($response->isNotModified($this->getRequest())){return $response;}else { // create a fresh response}$response->setVary(‘Accept-Encoding’);
  16. 16. Cache && Symfony 2 — Doctrine The least expensive query is the query you never run.
  17. 17. Cache && Symfony 2 — DoctrineDoctrineCommonCacheCache// Fetches an entry from the cache.string function fetch($id);// Test if an entry exists in the cache.bool function contains($id);// Puts data into the cache.bool function save($id, $data, $lifeTime);// Deletes a cache entry.bool function delete($id);
  18. 18. Cache && Symfony 2 — DoctrineUsing Doctrine: MetaData Cache Annotation (APC) Query Cache DQL parsed into SQL (APC/REDIS/MEMCACHED) Result Cache The query result (REDIS/MEMCACHED/APC)
  19. 19. Symfony 2 real ProductRepository... $query = $this->createQueryBuilder(‘p’) ->where(‘p.price > :price’) ->setParameter(‘price’, ‘19.99’) ->getQuery(); $products = $query->getResult();
  20. 20. Symfony 2 real ProductRepository... $query = $this->createQueryBuilder(‘p’) ->where(‘p.price > :price’) ->setParameter(‘price’, ‘19.99’) ->getQuery(); $query->useResultCache( true, $lifetime, __METHOD__ . serialize($query->getParameters()) ); $query->useQueryCache(); $products = $query->getResult();
  21. 21. “There are only two hard thingsin Computer Science: cacheinvalidation and naming things”Phil Karlton
  22. 22. Cache ProblemInvalidationEspecially for http, but in general, you should not waste time toinvalidate a value, but you should invest resources to find the righttime of validity.Cache miss stormWhen a resource is no longer available (cache miss), and is requiredby many clients simultaneously (storm), a congestion happens. cache miss storm, cache stampede, dog-piling, APC Cache slamUniqueness of the cache keyAttention to the conflicts in the key definition, always put a prefix ornamespace such as language or role.
  23. 23. Cache Optimization tips SymfonyMonitoring Scaling Application
  24. 24. TipsEasy rules: — The user should never wait, slow operation data in a queue (Redis/*MQ) processed by a consumer (cli + supersivord): —> Image Manipulation —> File Creation (pdf) —> Sending email as spool —> Log — Use Session with Redis/Memcache — Caution on what do you do in the loop && nested loop — Attention on every I/O — If there are to many “IF” the function may have an OOP problem — Think before Flush while{$em->persist(); $em->flush(); }
  25. 25. Tips — APCSetting ‘apc.stat=0‘You should clear the cache after changing the code, when you deployyou should do it after the event ‘symfony:cache:clear‘the ‘userx’ should restart php-fpm||apache gracefully,simply add to /etc/sudoersuserx ALL=(root) NOPASSWD: /usr/sbin/service apache2ctl gracefulor use the command ‘php -r “apc_clear_cache();”‘
  26. 26. Tips — AutoloaderImprove the autoloader performance:$ composer.phar dumpautoload --optimizeThis autoloader needs maintenance, execute the command during thedeploy after the event ‘symfony:assets:install‘
  27. 27. Tips — Cache CommonUse APC in order to save your custom data# config.ymlservices: cache: class: DoctrineCommonCacheApcCacheIn the Controllerif ($fooString = $this->get(‘cache’)->fetch(‘foo’)) { $foo = unserialize($fooString);} else { // do the work $this->get(‘cache’)->save(‘foo’, serialize($foo));}
  28. 28. Tips — DoctrineThe associations are LAZY by default// Order/** * @ManyToOne(targetEntity=”Cart”, cascade={“all”}, fetch=”EAGER”) */private $cart;If you want to change the fetch mode<?php$query = $em->createQuery(“SELECT o FROM MyProjectOrder o”);$query->setFetchMode(“MyProjectOrder”, “Cart”, “LAZY”);$query->execute();
  29. 29. Tips — Doctrine > 2.1What’s better then LAZY?/* * @ORMManyToMany(targetEntity=”Trips”, mappedBy=”rides”,fetch=”EXTRA_LAZY”) */private $trips;$turin->getTrips()->contains($turinCaselle);$turin->getTrips()->count();$turin->getTrips()->slice($offset, $length);
  30. 30. Tips — Doctrine > 2.1Read Only Entity/** * @ORMEntity * @ORMREADONLY */class Status
  31. 31. Tips — DoctrineThe wise use the reference$post = $postRepository->find($postId);$comment->setPost($post);$comment>addPost( $em->getReference(‘AcmeBundleEntityPost’, $postId));
  32. 32. Tips — Route / Virtual host$ app/console router:dump-apache --env=prod# _welcomeRewriteCond %{REQUEST_URI} ^/$RewriteRule .* app.php [QSA,L,E=_ROUTING__route:_welcome,E=_ROUTING_DEFAULTS__controller:AcmeDemoBundleControllerWelcomeController::indexAction]Insert the routes into the virtual host, they will become items of theglobal $_SERVER variable, and the ApacheUrlMatcher will read it.You could set external parameters directly into the virtual host<VirtualHost *:80> ServerName Symfony2 SetEnv SYMFONY__DATABASE__USER user SetEnv SYMFONY__DATABASE__PASSWORD secret
  33. 33. Tips — Monolog class: FullyQualifiedLoaderClassName arguments: [@logger] tags: - { name: monolog.logger, channel: acme }monolog: handlers: acme: type: stream path: /var/log/acme.log channels: acme doctrine: type: stream path: /var/log/doctrine.log channels: doctrine
  34. 34. TipsHttp-Microcaching: — Save all the responses for 1 second lot of examples on internet for NginxQuery Caching : — Don’t use ‘now()’ but date(‘y-m-d’) — Don’t use mysql rand()Twig : — Render with namespace — Controller can be embedded asyncronously using the javascript library hinclude.js.{% render ‘...:news’ with {}, {‘standalone’: ‘js’} %}
  35. 35. “get your assets in line”Kriss Wallsmith
  36. 36. Tips — Assetic Managment for PHP : — Minify and combine all of your CSS and JS files — Run all (or just some) of your CSS or JS files through some sort of compiler, such as LESS, SASS or CoffeeScript — Run image optimizations on your images
  37. 37. Tips — Assetic && Cloud{%- javascripts ‘@ ... /public/calendar.js’ ‘@ ... /public/base.js’ filter=”yui_js” package=’cdn’%}<script type=”text/javascript” src=”{{ asset_url }}”></script>{% endjavascripts %}# config.ymlassetic: write_to: %cdn_protocol%://%cdn_container_name% assets: common: inputs: [public/calendar.js, public/base.js] package: cdn filters: {yui_js}<script type=”text/javascript” src=”{{ assets/common.js }}”></script><script type=”text/javascript” src=””></script>
  38. 38. Tips — Assetic && cloud# config.ymlframework: templating: engines: ... packages: cdn: version: 20120904110916 version_format: ~ base_urls: http: [%cdn_container_url%] ssl: [%cdn_contailner_ssl_url%]assetic: write_to: %cdn_protocol%://%cdn_container_name% assets: common: inputs: [public/calendar.js, public/base.js] package: cdn filters: {yui_js}
  39. 39. Done everything?
  40. 40. Did you really need it?
  41. 41. Rationality
  42. 42. “Knowing when optimizationis premature defines the differencesthe master engineer andthe apprenctice”Theo Schlossnagle
  43. 43. Cache Optimization tips SymfonyMonitoring Scaling Application
  44. 44. Profiling => RationalityKnow the problemin dev — xdebug — symfony profilerin prod — xhprof — monitoring and statistics — Server monitoring (Nagios/Cacti/NewRelic/...) — Application monitoring (Statsd/NewRelic/...)
  45. 45. Application monitoring:The servers that you needStatsD — Node.JS daemon. Listens for message over UDP simple daemon for easy stats aggregation.Graphite — Real-time graphing system — Components: — Carbon stores the data in Graphite’s specialized database. — The data can then be visualized through graphite’s web interfaces developed with django. — Whisper allows carbon to write multiple data points.
  46. 46. Application monitoring:Installing: Statsd + Graphite + Carbon + Whisper Symfony2 + StatsdClientBundleUsing Vagrant is **** easy:$ gem install vagrant$ git clone graphite-puppet.git$ cd vagrant-statsd-graphite-puppet.git$ vagrant upnow install Symfony2 with StatsdClientBundle$ php composer.phar create-project symfony/framework-standard- edition$ composer require liuggio/statsd-client-bundleadd the bundle into the appKernel, copy/paste the configurationand ...
  47. 47. Symfony 2 && StatsDClientBundle
  48. 48. Symfony 2 && StatsDClientBundlehttp://localhost:8080
  49. 49. Cache Optimization tips SymfonyMonitoring Scaling Application
  50. 50. “It won’t scale if it’s not designedto scale”David Mitzenmacher
  51. 51. ScalingScaling verticallyget biggerScaling horizontallyget more
  52. 52. Scaling OOP Developing / SOA / EDA“The real world can be accurately described as a collection ofobjects that interact”Use the concepts from the OOP also for the services: — Single Responsability Principle — Open Close Principle — Law of Demeter — Don’t overcomplicateSOA: Service Oriented ArchitectureEDA: Event Driven Architecture
  53. 53. Conclusions — COULD — Use the cache — COULD — Optimize your application — SHOULD — Monitor your Servers/Applications — MUST — Follow the OOP/SOA
  54. 54. References