Multithreading

As little of the hardware is idle as possible as little of the time as possible, provided it is actually doing useful work

Fork and Join

When two tasks don't depend on each other, they can be multi-threaded. While this looks mostly like a single-threaded application, there is some amount of multi-threading.

Each time a thread is needed, a new thread is created for the job and destroyed afterwards.

One Thread per Subsystem

Some subsystem are running on a dedicated thread. The thread is created during the start of the game and is running for the entire game.

For example, networking, asset management, physics, AI, ...

Job Model

Code is packaged into a job data structure and is submitted to a thread pool. The thread pool schedules the job on a thread and once the job is done, it will let the original code know that the job is done.