Steve Kamerman | ScientiaMobile, Inc.
Co-Founder / Software Architect

High-Performance PHP with HipHop
2008 - Facebook's Challenge
●

Explosive growth

●

Need more servers!

●

Bottleneck: Page generation

●

20% of PHP time...
Why is PHP so slow?
●

Symbol table lookups

●

No static binding

●

Dynamic typing

●

Share-Nothing-Architecture
2008-2010 – HipHop for PHP is born
●

400 Billion PHP-generated pageviews per
month!

●

Facebook invents HipHop for PHP

...
HipHop for PHP

Research &
Development

HPHPc

HHVM
What is HipHop for PHP?
• Multi-threaded web server + PHP runtime
• HPHPc: PHP -> C++ translator
• HHVM: PHP virtual machi...
HipHop for PHP Compiler (HPHPc)
●

Translates PHP code into C++

●

Dynamic typing makes this difficult

●

Function parit...
Our Experience
●

Created WURFL Cloud REST API

●

Evaluated HPHPc

●

Improved Latency

●

Stability issues
Architecture
Internet

HAProxy
Load Balancer
(primary)

WURFL Node
HPHPc

Apache

WURFL Node
HPHPc

Apache

HAProxy
Load B...
Codebase Updates

http://www.github.com/kamermans/HAProxyAPI
Next-Gen HipHop: HHVM
●

Virtual Machine

●

Better PHP Support

●

JIT Compiler

●

Bytecode Survives Restart
How HHVM works
Internet

HHV
M

Web Server

Run Native
Code
Run Bytecode
Generate
Bytecode

JIT Compile
HHVM vs HPHPc Performance

http://www.hhvm.com/blog/875/wow-hhvm-is-fast-too-bad-it-doesnt-run-my-code
https://github.com/...
Optimizing PHP for HHVM
●

Type Inference
–

PHP Gotcha: core function fail with (bool)false

●

HHVM Upgrades primitives
...
Don't care about type strict comparison?
You should. Trust me.
var_export("true" == true); // true  
var_export("false" ==...
Avoid global scope
●

●

Code in the global scope is interpreted since it
is (nearly) impossible to type-track
Even wrappi...
Unique Classes, Functions, Constants
●

HHVM supports namespaces – use them!

●

MyAppBar and MyAppFooBar are not ambiguou...
Better approach: don't use define()
namespace MyApp;
class Config {
const MY_CONST = "I'm real constant";
private static $...
Avoid dynamic variables
●

If you are using this syntax, there is a better way to solve
the problem:
$foo = "Wow, this hur...
Declare class properties
●

They should be declared anyway
$foo = new stdClass();
echo $foo->bar; // PHP Notice: Undefined...
Perfomance Gain
●
●

Less than 5%, but still good practice
Sub-optimal functions still work, even
eval() and goto!

http:/...
Repo.Authoritative Mode
●

Pre-Analyze files

●

PHP files assumed unchanged

●

Delete cache manually
Current state of HipHop
●

HHVM v2.2.0 just released

●

Very close to PHP 5.4

●

Dozens of extensions

●

Performance ne...
Framework Support
Framework % Unit Tests Pass

Framework % Unit Tests Pass

Facebook PHP SDK 100

CodeIgniter 81

Paris9 1...
Why is it open source? Will it last?
●

Under PHP license, hard to separate

●

Public activity slowed in 2011

●

Under a...
Facebook's Commitment

“In years past we've had a few examples of projects which have not
been well supported, but we are ...
References
●

●

●

●

●

Special thanks to the HipHop for PHP team!
https://www.facebook.com/hphp
Twitter: @HipHopVM
http...
IPC 2013 - High Performance PHP with HipHop
Upcoming SlideShare
Loading in...5
×

IPC 2013 - High Performance PHP with HipHop

6,033

Published on

A look at Facebook's HipHop for PHP library, both the first generation, HPHPc, and the new HHVM. This presentation walks through the challenges that faced Facebook and their PHP-based solution from a year after their explosive growth in 2007 to late-2013.

Published in: Technology
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
6,033
On Slideshare
0
From Embeds
0
Number of Embeds
14
Actions
Shares
0
Downloads
26
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide
  • {"5":"154k/second, or 154/sec per server on 1000 servers\n","11":"Facebook was customer\nReduced latency from 20ms (Apache) to 2m\nPeak traffic over 1500 req/sec, load tested at over 10k req/sec per serverCode rebuild took almost 10 minutes per server\nHPHP and Apache shared the same document root\nCompilation of HPHP itself was painful! Super-specific dependencies\n","23":"To use:\nAnalyze:\nhhvm --hphp --target hhbc --input-list <(find -name "*.php") -k1 -l3\nMove in hhvm.hhbc\nRestart server\n","8":"Literally translated PHP code into human-readable C++, preserving class names\nAt Facebook, PHP and C++ are common languages, so this works well\nMany versions of each function may be generated with different parameter types to optimized code\nCompilation at Facebook took 20min (across 100 machines)\n"}
  • IPC 2013 - High Performance PHP with HipHop

    1. 1. Steve Kamerman | ScientiaMobile, Inc. Co-Founder / Software Architect High-Performance PHP with HipHop
    2. 2. 2008 - Facebook's Challenge ● Explosive growth ● Need more servers! ● Bottleneck: Page generation ● 20% of PHP time was in native code
    3. 3. Why is PHP so slow? ● Symbol table lookups ● No static binding ● Dynamic typing ● Share-Nothing-Architecture
    4. 4. 2008-2010 – HipHop for PHP is born ● 400 Billion PHP-generated pageviews per month! ● Facebook invents HipHop for PHP ● Deployed system-wide in 2010
    5. 5. HipHop for PHP Research & Development HPHPc HHVM
    6. 6. What is HipHop for PHP? • Multi-threaded web server + PHP runtime • HPHPc: PHP -> C++ translator • HHVM: PHP virtual machine with JIT compiler • Typically 2x – 5x speed increase over stock PHP + APC
    7. 7. HipHop for PHP Compiler (HPHPc) ● Translates PHP code into C++ ● Dynamic typing makes this difficult ● Function parity lacking ● Long compilation time
    8. 8. Our Experience ● Created WURFL Cloud REST API ● Evaluated HPHPc ● Improved Latency ● Stability issues
    9. 9. Architecture Internet HAProxy Load Balancer (primary) WURFL Node HPHPc Apache WURFL Node HPHPc Apache HAProxy Load Balancer (secondary) WURFL Node HPHPc Apache WURFL Node HPHPc Apache Memcached Memcached Memcached Memcached MySQL MySQL MySQL MySQL
    10. 10. Codebase Updates http://www.github.com/kamermans/HAProxyAPI
    11. 11. Next-Gen HipHop: HHVM ● Virtual Machine ● Better PHP Support ● JIT Compiler ● Bytecode Survives Restart
    12. 12. How HHVM works Internet HHV M Web Server Run Native Code Run Bytecode Generate Bytecode JIT Compile
    13. 13. HHVM vs HPHPc Performance http://www.hhvm.com/blog/875/wow-hhvm-is-fast-too-bad-it-doesnt-run-my-code https://github.com/facebook/hhvm/blob/master/hphp/doc/ir.specification
    14. 14. Optimizing PHP for HHVM ● Type Inference – PHP Gotcha: core function fail with (bool)false ● HHVM Upgrades primitives ● Use strict comparison
    15. 15. Don't care about type strict comparison? You should. Trust me. var_export("true" == true); // true   var_export("false" == true); // true   var_export("true" == (bool)"false"); // true var_export(strpos("Steve Kamerman", "Kamerman") == true); // true   var_export(strpos("Steve Kamerman", "Steve") == true); // false   $test = "31 is too old!"; var_export(31 == $test); // true var_export("31.0" == 31); // true var_export("031" == 031); // false var_export(31.0 == 31); // true var_export($test += 1); // 32
    16. 16. Avoid global scope ● ● Code in the global scope is interpreted since it is (nearly) impossible to type-track Even wrapping global code helps: class foo{public static function bar(){ $something = "test"; echo $something; }}foo::bar(); ● Better approach: don’t write crappy code!
    17. 17. Unique Classes, Functions, Constants ● HHVM supports namespaces – use them! ● MyAppBar and MyAppFooBar are not ambiguous ● ● ● Avoid “dynamic” constants: define("MY_CONST", $foo? "foo": "bar"); I can almost picture a feature request for undefine() and redefine() If they are truly constant, use const
    18. 18. Better approach: don't use define() namespace MyApp; class Config { const MY_CONST = "I'm real constant"; private static $storage = array( "PSEUDO_CONSTANT" => "What did you call me?", ); public static function get($name) { if (!array_key_exists($name, self::$storage)) { throw new Exception(__CLASS__." property [$name] does not exist"); } return self::$storage[$name]; } } echo Config::MY_CONST."n";
    19. 19. Avoid dynamic variables ● If you are using this syntax, there is a better way to solve the problem: $foo = "Wow, this hurts my brain!"; $var_name = "foo"; echo $$var_name; ● ● extract() and compact() are sometimes used more legitimately (ex: view rendering), but avoid them If you need get_defined_vars() for non-testing code, you need to rewrite it before someone sees it :)
    20. 20. Declare class properties ● They should be declared anyway $foo = new stdClass(); echo $foo->bar; // PHP Notice: Undefined property ● Getters are optimized
    21. 21. Perfomance Gain ● ● Less than 5%, but still good practice Sub-optimal functions still work, even eval() and goto! http://php.net/manual/en/control-structures.goto.php
    22. 22. Repo.Authoritative Mode ● Pre-Analyze files ● PHP files assumed unchanged ● Delete cache manually
    23. 23. Current state of HipHop ● HHVM v2.2.0 just released ● Very close to PHP 5.4 ● Dozens of extensions ● Performance nearly 5x ● Goal: Support top 20 frameworks in 2013
    24. 24. Framework Support Framework % Unit Tests Pass Framework % Unit Tests Pass Facebook PHP SDK 100 CodeIgniter 81 Paris9 100 Assetic 80 Idiorm9 100 Twig 78 Slim 99 Wordpress 76 Drupal 98 phpBB 0 Composer 97 CakePHP 0 Laravel 95 Joomla 0 yii 92 PHPMyAdmin 0 Symfony 91 zf2 0 PHPUnit2 90 Doctrine 0 Magento 0 http://www.hhvm.com/blog/875/wow-hhvm-is-fast-too-bad-it-doesnt-run-my-code
    25. 25. Why is it open source? Will it last? ● Under PHP license, hard to separate ● Public activity slowed in 2011 ● Under active public development in 2012-13 ● Dev team is active on IRC (freenode #hhvm)
    26. 26. Facebook's Commitment “In years past we've had a few examples of projects which have not been well supported, but we are now much better at growing and sustaining community projects, including, lately, in mobile. [HipHop for PHP] is absolutely a project that we stand strongly behind… stay tuned.” James Pearce, Head of Developer Advocacy at Facebook
    27. 27. References ● ● ● ● ● Special thanks to the HipHop for PHP team! https://www.facebook.com/hphp Twitter: @HipHopVM http://www.hhvm.com/ Sebastian Bergmann – Static Code Analysis with HipHop http://sebastian-bergmann.de/archives/918-Static-Analysis-with-HipHop-for-PHP.html http://www.slideshare.net/nickgsuperstar/static-analysis-for-php https://github.com/sebastianbergmann/hhvm-wrapper Haiping Zhao – HipHop Compiler for PHP? Transforming PHP into C++ http://www.youtube.com/watch?v=p5S1K60mhQU Sara Golemon – Scaling with HipHop http://www.youtube.com/watch?v=Dwek7dZDFN0 Ben Foster – Facebook Growth Data http://www.benphoster.com/facebook-user-growth-chart-2004-2010/
    1. A particular slide catching your eye?

      Clipping is a handy way to collect important slides you want to go back to later.

    ×