PSR-6 & Symfony Cache : de la perf en standard

Après plusieurs mois de discussion, le PHP-FIG (PHP Framework Interop Group) a publié la PSR-6. Son objectif est de permettre l'interopérabilité entre implémentations de systèmes de mise en cache - un aspect indispensable pour gagner en performance dans votre application. Lors de cette conférence, nous verrons les avantages et les limites de PSR-6, nous discuterons des différentes solutions de cache existantes (Doctrine, Stash, php-cache), et je vous présenterai le nouveau composant Symfony Cache.

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1. PSR-6 & Symfony Cache
   de la perf en standard
   #PHPTour
   @nicolasgrekas
   joind.in/17700
   

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2. @nicolasgrekas
   #PHPTour
   

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3. #PHPTour joind.in/17700 @nicolasgrekas
   

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4. #PHPTour joind.in/17700 @nicolasgrekas
   

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5. #PHPTour joind.in/17700 @nicolasgrekas
   

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6. PSR-6
   Caching Interface
   Draft: Sept. 2013
   Final: Dec. 2015
   

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7. #PHPTour joind.in/17700 @nicolasgrekas
   • A common interface for basic and
   intermediate-level caching needs.
   • Allow for multiple independent
   extensions without collision.
   PSR-6 Goals
   

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8. #PHPTour joind.in/17700 @nicolasgrekas
   • Architectural compatibility with all
   existing cache implementations.
   • Advanced caching features such as
   namespacing or tagging.
   PSR-6 Non-Goals
   

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9. #PHPTour joind.in/17700 @nicolasgrekas
   • doctrine/cache 16.8M
   • sonata-project/cache 1.3M
   • zendframework/zend-cache 1.1M
   • illuminate/cache 0.5M
   • tedivm/stash 0.4M
   PSR-6 Prior-art on Packagist
   

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10. #PHPTour joind.in/17700 @nicolasgrekas
    PSR-6 Concerns
    

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11. #PHPTour joind.in/17700 @nicolasgrekas
    • Crippled with “Bylaws”
    • Not always representative
    • Strategic hijacking
    • Way too much noise/overhead
    • Mission is unclear
    PHP-FIG Weaknesses
    

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12. PHP-FIG Strength
    Standards!
    Let’s do with!
    

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13. #PHPTour joind.in/17700 @nicolasgrekas
    PSR-6 Example #1
    

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14. #PHPTour joind.in/17700 @nicolasgrekas
    PSR-6 Example #2
    

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15. #PHPTour joind.in/17700 @nicolasgrekas
    PSR-6 CacheItemPoolInterface
    

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16. #PHPTour joind.in/17700 @nicolasgrekas
    PSR-6 CacheItemInterface
    

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17. #PHPTour joind.in/17700 @nicolasgrekas
    • CacheItemInterface instances
    are not interoperable
    • Restricted characters for keys
    • false as error reporting
    • No atomicity/transactionality
    PSR-6 Edge-cases
    

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18. #PHPTour joind.in/17700 @nicolasgrekas
    • See on Packagist
    https://packagist.org/providers/psr/cache-implementation
    • Stash PHP – stashphp.com
    • PHP Cache – php-cache.com
    • and …
    PSR-6 Implementations
    

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19. Welcome
    Symfony Cache
    

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20. #PHPTour joind.in/17700 @nicolasgrekas
    • Be the most powerful PHP caching library
    • A strict PSR-6 implementation
    • Following Symfony’s quality
    processes*
    • Just the bare minimum to be
    fast by default
    * Thanks "cache/integration-tests"!
    Symfony Cache Goals
    

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21. #PHPTour joind.in/17700 @nicolasgrekas
    • ApcuAdapter
    • ArrayAdapter
    • FilesystemAdapter
    • RedisAdapter
    • It’s up to you to add more
    Base Symfony Cache Adapters
    

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22. #PHPTour joind.in/17700 @nicolasgrekas
    • AbstractAdapter
    • ChainAdapter
    • DoctrineAdapter
    • ProxyAdapter
    Special Symfony Cache Adapters
    

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23. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Cache CacheItem
    

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24. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Cache AbstractAdapter
    

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25. #PHPTour joind.in/17700 @nicolasgrekas
    Doctrine 834.863 items/ms
    PHP Cache 313.334 items/ms
    Stash PHP 55.346 items/ms
    Symfony 533.366 items/ms
    Bench Symfony Cache
    

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26. #PHPTour joind.in/17700 @nicolasgrekas
    Doctrine 705.999 items/ms
    PHP Cache 362.477 items/ms
    Stash PHP 153.803 items/ms
    Symfony 845.910 items/ms
    Bench Symfony Cache
    

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27. Symfony
    Framework
    Wiring
    

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28. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Framework Concepts
    Front 1 - APCu Front 2 - APCu
    Redis
    Pool 1: Annotations
    Pool 2: Validation
    Pool 3: SQL results Pool 4: API responses
    

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29. #PHPTour joind.in/17700 @nicolasgrekas
    • Two core cache pool services:
    o cache.app for you
    • Defaults to filesystem, change it to Redis
    o cache.system derived for Symfony
    • Defaults to APCu+filesystem chain
    Symfony Framework
    

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30. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Framework Services
    

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31. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Framework Config
    

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32. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Framework Services
    

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33. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Framework Services
    

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34. #PHPTour joind.in/17700 @nicolasgrekas
    Symfony Framework Services
    

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35. What’s next?
    

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36. #PHPTour joind.in/17700 @nicolasgrekas
    • Cache warming-up
    o Regeneration Before Expiration
    o Desynchronized Cache Misses
    o Stampede Protection
    Beyond PSR-6
    

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37. #PHPTour joind.in/17700 @nicolasgrekas
    • Cache invalidation
    o Hierarchy
    o Tagging
    Beyond PSR-6
    

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38. #PHPTour joind.in/17700 @nicolasgrekas
    • Warm-up Validator, Serializer, etc.
    • $cache->invalidate($tags);
    • Serve stale items while refreshing?
    • Add a profiler panel with hits/misses?
    • Deprecate current way of caching
    • Borrow more ideas from Drupal?
    Symfony 3.2?
    

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39. “There are only two
    hard things in
    Computer Science:
    cache invalidation and
    naming things.”
    -- Phil Karlton
    

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40. Merci ! #PHPTour
    @nicolasgrekas
    joind.in/17700
    

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