Swoole is a C extension for PHP that provides asynchronous network capabilities for high concurrency. It allows PHP to have an event-driven architecture and non-blocking I/O like Node.js. Swoole uses coroutines to schedule blocking I/O so it does not block the entire process. Benchmark tests showed Swoole can achieve much higher concurrency than traditional PHP. Companies like Facebook use Swoole for services that require high performance and scalability.

1. How Swoole
Blows Up Your Mind?
@PHPCon Okinawa 2019
By Albert Chen

2. About Me
• Albert Chen
• Software Architect
• M17 HandsUp
• Open Source Maintainer

3. What is Swoole?

5. What is Swoole?
• A C extension for PHP
• An asynchronous network engine for PHP
• Features:
• Event-driven non-blocking I/O
• HTTP / HTTP2 / Websocket / TCP / UDP
• Coroutine (CSP Model)
• High performance for high concurrency

6. Why PHP Performs
Poorly in High Concurrency?

7. Lifecycle in PHP

8. Lifecycle in PHP
PHP
Files
Tokenizing
Semantic
Parsing
AST
Generate
Bytecode
Execute
Bytecode
Output
Load Bytecode
From Memory
Check
Bytecode Cache

9. Blocking I/O in PHP
Request
Request
Request
Request
PHP
FPM
FPM
Pool
FPM
Pool
Worker
Worker
Worker
Worker
Blocking I/O

10. Eventloop in NodeJS

11. There’s no Eventloop
in Traditional PHP

12. Let’s See What Changes
in Swoole?

13. Structure in Swoole Server

14. Structure in Swoole Server
• Code Is Persistent in Memory
• Swoole Takes Lifecycle Over PHP
• Reduce Initialization Steps
• Reduce Response Latency
• Event-driven Non-blocking I/O for Requests

15. Benchmark Comparison
of Go with Swoole

16. Server Benchmark in Go

17. Server Benchmark in Go

18. Server Benchmark in Swoole

19. Server Benchmark in Swoole

20. This Doesn’t Mean
PHP with Swoole is Faster Than Go
(Of Course Not)

21. Coroutine in Swoole

22. Coroutine in Swoole
• Blocking I/Os Are Scheduled By Coroutine Automatically.

23. Coroutine in Swoole
• Blocking I/Os Are Scheduled By Coroutine Automatically.

24. Coroutine in Swoole
• CSP Model

25. Does This Mean Every
Blocking I/O Doesn’t Block Anymore?

26. Coroutine in Swoole
• How about This?

27. Coroutine in Swoole
• How about This?

28. Runtime Hooks
Transform Blocking I/Os into
Coroutines with Magic!

29. Use Case
In HandsUp

30. Use Case
Facebook
Webhooks
Message
Load
Balancer
Server
Server
Server
Queue
PubNub
Service
Analysis
Service
Swoole Service
PubSub
Many to Many
Queue Workers
High Concurrent
Requests

31. Use Case
• Replace Guzzle Handler with Swoole Client

32. Q&A