HHVM: A High Performance PHP Engine

Transcript

1. HHVM A High Performance PHP Engine 夏绪宏 reeze@php.net 商派电商技术沙⻰龙 · PHP⾼高级架构技术
2. About Me • 夏绪宏： 百度贴吧 • Weibo： @reeze • Website: http://reeze.cn/ • Github: http://github.com/reeze • Hiring: http://lamp.baidu.com/join-us/
3. PHP Sucks!!
4. Sorry! Just kidding ;-)
5. PHP is the best language in the world! Surely,
6. What I am going to talk about • I am NOT trying to convince you • PHP is a bad language, definitely not! • PHP is a good language, it…. just a prog language. • to use HHVM, try it yourself :) • Talk about HHVM & programming languages.
7. Outline • Introduction • Architecture • What Makes HHVM Fast? • HHVM Goodies
8. So, What is PHP? • The PHP Programming Language you ❤️ [1] • php.net (Zend PHP) is a reference implementation of PHP • Blah blah….. [1] https://github.com/php/php-langspec
9. What is HHVM? • HHVM is another PHP implementation [1] • Start from a source code transformer: HPHPc • A Virtual Machine with a JIT Compiler • Support all PHP syntax • 97.16% open source project compatibility [2] [1] https://github.com/facebook/hhvm [2] http://hhvm.com/frameworks/
10. What is HHVM? • Design goals of HHVM: • Compatibility • High Performance • Predictable Performance • Developer Productivity
11. What is HHVM?
12. Why • Why yet another PHP implementation? • PHP is SLOW, (back then) • No breaking improvements made
13. Interpreter vs Compiler [1] • Interpreter: • one high level instruction (opcode) a time • execute source code by handlers • Compiler: • generate source code target low level code • execute low level code (eg: native code, ASM) [1] https://www.youtube.com/watch?v=_C5AHaS1mOA
14. Different Implementations • HHVM • HippyVM • HappyJIT • etc… • PHP is a very large language, • Bug? Feature? Bug-Oriented-Programming :-)
15. Who use it? [1] • Facebook • Baidu • Wikimedia • Box • etc… • Nonofficial source: Jd, Dangdang, Xiaomi etc… [1] https://github.com/facebook/hhvm/wiki/Users
16. HHVM Architecture Overview
17. HHVM Architecture
18. HHVM Architecture HHVM – Process Model
19. What Makes HHVM Fast? Backend Optimizations JIT Compiler Type Inference etc…
20. HHVM – Compiling to Native Credit：Include Hack
22. Type Inference
23. Example
24. Interpreter:
25. JIT • JIT: Just-In-Time Compiler • Runtime compilation • Compile to native machine code • Can take advantage of runtime information • Type information is crucial in dynamic typed language • Eliminate box/unbox cost • Eliminate type checking cost
26. Tracelet is a: Single entry, (maybe) multiple exit region
27. JIT
28. JIT max2(1, 2)
29. JIT
30. Credit：Include Hack
31. Credit：Include Hack
32. HHVM Goodies
33. Friendly Extension API • HNI: HHVM Native Interface
34. Friendly Extension API • Systemlib: Write extension with PHP (JIT could help to improve perf)
35. Hack Lang • Statically Typed • Async Functions • Generics • Return Typehints (Now PHP7 support it) • etc…
36. Credit：Include Hack
37. Admin Server • A friendly HTTP port • /stop • /check-health • /status • /vm-tcspace • /jemalloc-stats • etc… Page Server Admin Server Internal status booking & management Request Handling
38. Conclusion
39. HHVM drive the PHP community forward Performance New Features Standard Spec
40. HHVM • HHVM is good at CPU bound apps: 50% reduction in really world apps • Hack’s async functions may help you improve performance as well • Compiles slowly & not support all of *Nix systems • Do your benchmarking, always.
41. References • http://lamp.baidu.com • http://lamp.baidu.com/slides/introduction-to-hhvm/ • http://hhvm.com • http://wuduoyi.com/note/hhvm/ • 《Include Hack》 • 《The HipHop Virtual Machine》
42. Thank You!