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:* [email protected] <javascript:> [mailto:
> [email protected] <javascript:>] *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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