What types of queues are used in the Go scheduler?

The Go (Golang) scheduler uses several types of queues to manage goroutines:

• Run queue: Each system core (P) has its own local queue of goroutines ready to run. The scheduler selects goroutines from this queue for execution.
• Global run queue: If a local queue is full or empty, goroutines can be placed into or taken from a global queue shared by all P's.
• Work stealing queues: If a local P queue is empty, it can 'steal' goroutines from other P queues to evenly distribute the load.

Thus, the Go scheduler uses a combination of local and global queues with a work stealing mechanism to efficiently distribute goroutines across system threads.