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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