On Wed, Apr 10, 2019 at 4:52 AM <mountain...@gmail.com> wrote:
>
> My macos has 4 cores, but i start 3 goroutines, 2 sub goroutines, 1 main
> goroutine.
> After main goroutine exec 3 times output, triggering gc causes gcwaiting=1.
> Finally all goroutine blocking
>
> package main
>
> import (
> "fmt"
> "log"
> "net/http"
> _ "net/http/pprof"
> "runtime"
>
> // "runtime"
> "time"
> )
>
> func deadloop() {
> for {
> }
> }
> func main() {
> go func() {
> log.Println(http.ListenAndServe("localhost:6060", nil))
> }()
>
> go deadloop()
>
> i := 3
> for {
> time.Sleep(time.Second * 1)
> i--
> fmt.Println("I got scheduled!")
> if i == 0 {
> runtime.GC() //will set gcwaiting=1， causes other goroutines not to be
> scheduled
> }
> }
> }
I'm not sure quite what you are asking, but the garbage collector has
to briefly stop all goroutines twice each cycle, as described in the
comment in runtime/mgc.go.
Ian
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