Yes, I just want to let the bar func goroutine run first or replace
runtime.Gosched()
with time.Sleep,
But I still doubt why add1 in bar func don't happen preempt schedule ?
在 2017年9月4日星期一 UTC+8下午3:25:04，John Souvestre写道：
>
> I think that you put the call to runtime.Gosched() in the wrong place.
> You want to place it in the routine which needs to be pre-empted. In your
> example, in add1() inside the “for i” loop or in bar() in the “for” loop.
>
>
>
> John
>
> John Souvestre - New Orleans LA
>
>
>
> *From:* golan...@googlegroups.com <javascript:> [mailto:
> golan...@googlegroups.com <javascript:>] *On Behalf Of *???
> *Sent:* 2017 September 04, Mon 02:10
> *To:* golang-nuts
> *Subject:* Re: [go-nuts] golang gc stop the world how to stop cpu busy
> goroutine?
>
>
>
> package main
>
>
>
> import "runtime"
>
>
>
> // GOMAXPROCS=1
>
> var sum1, summain int64
>
>
>
> func add1() {
>
> for i := 0; i < 10000; i++ {
>
> for j := 0; j < 10000; j++ {
>
> sum1++
>
> }
>
> }
>
> }
>
>
>
> func bar() {
>
> for {
>
> add1()
>
> }
>
> }
>
>
>
> func main() {
>
> go bar()
>
> runtime.Gosched()
>
> println("debug>>>")
>
> }
>
>
> above is my example code,when I set GOMAXPROCS=1 and build with -gcflags
> "-N -l" the println("debug>>>") don't execute
>
> I just doubt the go runtime support peempt schedule in call function, it
> don't work ??
>
>
>
> 在 2017年9月4日星期一 UTC+8下午2:20:37，John Souvestre写道：
>
> Although a goroutine isn’t pre-emptible by the Go scheduler, there is an
> opportunity whenever it does something which blocks or when it calls a
> non-inlined function. So generally the GC’s STW can take place pretty
> quickly. But if you are doing something with is totally compute bound then
> it can be a problem. An easy solution is to insert a call to
> runtime.Gosched() every so often.
>
>
>
> I believe that there is an ongoing discussion about a way for Go to plan
> ahead and be able to handle even these cases, but it’s something for the
> future.
>
>
>
> John
>
> John Souvestre - New Orleans LA
>
>
>
> *From:* golan...@googlegroups.com [mailto:golan...@googlegroups.com] *On
> Behalf Of *???
> *Sent:* 2017 September 04, Mon 00:47
> *To:* golang-nuts
> *Subject:* [go-nuts] golang gc stop the world how to stop cpu busy
> goroutine?
>
>
>
> when have one or two cpu busy goroutine in my server (example for loop
> empty), the gc stop the world how to stop the goroutine ?
>
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