Telephonic whispers with GOMAXPROCS set in Go.

telephonic-whispers-with-maxprocs.go

package main

import (
	"fmt"
	"runtime"
)

func whisper(left, right chan int) {
    left <- 1 + <- right
}

func main() {
    runtime.GOMAXPROCS(runtime.NumCPU())
    const n = 100000
    leftmost := make(chan int)
    right := leftmost
    left := leftmost
    for i := 0; i < n; i++ {
        right = make(chan int)
        go whisper(left, right)
        left = right
    }
    go func(c chan int) { c <- 1 }(right)
    fmt.Println(<- leftmost)
}