How?

• Process
• Thread
• Event Loop

• Mono-Thread
• Synchronous

=> Solution configure a pool (launch a set of PHP's process) with load balancer
It's an Architrecture solution use by: Apache, Nginx, Jetty etc.

• Mono-Thread
• Asynchronous

=> Solution based on callback, each function enters inside the loop (only one by one) then sends to the system
Then, computation ends the loop receives and trigs callback
It's an Applications Framework solution use by: Node.js, EventMachine(Ruby), Tornado(Python), etc.

Event Loop

• Don't block event loop
• Long running calculations
• Blocking APIs (Java)
• Thread concurrency (synchronized,volatile, locking)

Hybrid Model

• One JVM - One Vert.x instance
• One Vert.x instance - Thread number = Core number
• One Thread - One Event Loop
• Each Verticle assign One Thread