Consume 2.4gb of RAM firing blocked goroutines

memory.go

package main

import (
  "fmt"
  "time"
)

var counter int = 0

var goroutines int = 500000

var c chan interface{}

func main() {
  fmt.Println("starting")
  c = make(chan interface{})
  go reporter()
  starter()
  for i := goroutines; i > 0; i-- {
    <- c
    counter--
    if i % 1000 == 0 {
      time.Sleep(1 * time.Nanosecond)
    }
  }

  close(c)

  for {
    time.Sleep(1 * time.Second)
  }
}

func starter() {
  for i := goroutines; i > 0; i-- {
    if i % 1000 == 0 {
      time.Sleep(1 * time.Nanosecond)
    }
    counter++
    go func() {
      c <- true
    }()
  }
}

func reporter() {
  for {
    time.Sleep(500 * time.Millisecond)
    fmt.Println("counter:", counter)
  }
}