Why Does My Go Program Stall with GOMAXPROCS(2) Set Despite High CPU Usage?

GOMAXPROCS Set to 2, Yet Program Stalls

When attempting to run a program that sets runtime.GOMAXPROCS(2), users may encounter unexpected hangups despite high CPU utilization. This occurs due to an infinite loop in a goroutine denoted as forever().

This loop consumes an entire OS thread without performing any useful work, thus interfering with the runtime's goroutines. Particularly in Go1.5, it can block the garbage collector's stop-the-world phase.

To resolve this issue, one can introduce a scheduling point within the forever() loop:

func forever() {
    for {
        runtime.Gosched()
    }
}

However, it is generally more efficient to eliminate the busy loop altogether, ensuring smooth execution of the program.

The above is the detailed content of Why Does My Go Program Stall with GOMAXPROCS(2) Set Despite High CPU Usage?. For more information, please follow other related articles on the PHP Chinese website!