is stop the world and restart the world overhead expensive?

[杨杰]

i implement an goroutine profile which use frame pointer to get traceback.

it need stop and restart the world with 100hz.

is this operation expensive?

see https://github.com/felixge/fgprof/issues/31

[Ian Lance Taylor]

On Mon, Jul 1, 2024 at 5:45 AM 杨杰 <zdyj317...@gmail.com> wrote:
>
> i implement an goroutine profile which use frame pointer to get traceback.
>
> it need stop and restart the world with 100hz.
>
> is this operation expensive?

Yes.

Since the concern is profiling, I'll note that it will also
significantly affect the program's behavior, so a profile that is
constantly stopping and starting the world may not be a good
reflection of the performance of the program when that is not
happening.

Ian