How many types of queues are implemented in the GMP model?

The GMP model (Golang's GMP — this is the internal scheduler model of goroutine, M — OS thread, P — processor) implements two main types of queues:

1. Local run queue — a local task (goroutine) queue for each P (processor). Each P has its own queue from which it takes tasks for execution.

2. Global run queue — a global task queue shared among all P's, where tasks are placed if local queues are full or during load balancing.

Thus, the GMP model implements two main queues for goroutine scheduling: local and global.