Vice-versa. Asynchronous preemption is when the goroutine is *not* waiting
in a syscall, but is performing computations. If it spends too much time
working, it will be kicked off and another goroutine given a chance to run
on the same thread.
On Wednesday, 29 June 2022 at 17:24:21 UTC+1 TH wrote:
> Hey Kurtis,
>
> Is asynchronous preemption only the ones that are waiting for netpolls? So
> when a call is waiting on a network receive or send, scheduler will context
> switch? And when... lets say... for { i++ } -loop get's preemptied, this
> would be called synchronous preemption? Or is it vice versa?? Bit confused.
>
> Thanks
>
> On Wednesday, 29 June 2022 at 05:21:27 UTC+3 Kurtis Rader wrote:
>
>> The "asyncpreemptoff" debug option may be useful. See
>> https://pkg.go.dev/runtime. Specifically, try running your program after
>> doing "export GODEBUG=asyncpreemptoff=1". I'll leave it to others to
>> explain why this can be risky; especially in a context like you described.
>>
>> On Tue, Jun 28, 2022 at 6:45 PM TH <tins...@gmail.com> wrote:
>>
>>> Hey,
>>>
>>> I'm writing some latency & speed sensitive routines that are processing
>>> large amount of signal data in batches. When I run this in a standalone
>>> program the speed is fine. However when I combine this to the rest of
>>> software (>1000 goroutines, mainly network code) the speed gets reduced by
>>> 2x.
>>>
>>> Are there any low-level ways to temporary prevent preemption of a
>>> function or a goroutine?
>>>
>>> Alternatively I tried to run two piece of software in parallel, via
>>> shm+IPC synchronization methods, but futex, posix mutex, pipes, all
>>> produced latency jitter from 20us - 200us. If there's lower latency methods
>>> or more stable ones, please do recommend.
>>>
>>> Thanks
>>>
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>>>
>>
>>
>> --
>> Kurtis Rader
>> Caretaker of the exceptional canines Junior and Hank
>>
>
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