Re: [milo-dev] [Q] How to keep the specified sampling interval accuratel

[Shigeru Ishida <ishida_shigeru@xxxxxxxxxxx>]

I see. It is certainly necessaly.

<philip@xxxxxxxxxx> wrote, Tue, 31 Oct 2017 08:42:05 -0400

> Don't forget about garbage collection, either.  While the new G1GC
> system is a great improvement, it is hard to get GC pauses consistently
> under 20ms, so your application will have to tolerate occasional jitter.
> 
> On 10/31/2017 07:57 AM, Kevin Herron wrote:
> > SubscriptionModel is only meant to server as a naive example of how
> > you might sample your underlying data source.
> > 
> > I expect users to implement their own more sophisticated approach to 
> > sampling. Ideally, one that accurately tracks how long sampling took
> > and can adjust its next execution, as you suggest, and also samples
> > the data without resorting to calling read() on the namespace.
> > 
> > At work, our underlying data sources are PLCs, so I've developed a 
> > "RequestExecutor" system that handles scheduling these requests to
> > the PLC and accounts for the latency of each request as it
> > re-schedules the next execution. I'm not able to open source this
> > work right now, but it's not all that complicated to build on your
> > own.
> > 
> > On Mon, Oct 30, 2017 at 9:34 PM, Shigeru Ishida
> > <ishida_shigeru@xxxxxxxxxxx> wrote:
> > 
> >> Hi Kevin,
> >> 
> >> Is there a way to keep the specified sampling interval accurately 
> >> when developing a server ? For example, when 100 (msec) is
> >> specified, it took 110 (msec), so the next sampling is done at 90
> >> (msec).
> >> 
> >> Looking at the code of SubscriptionModel.java, it seems difficult 
> >> because it uses ScheduledExecutorService.
> >> 
> >> Regards,
> >> 
> >> --Shigeru _______________________________________________ milo-dev
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> > 
> > 
> > 
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