Re: Delayed response for sleep function

From: Seth (bugs_at_[hidden])
Date: 2022-06-21 21:33:54

On Tue, Jun 21, 2022, at 4:42 PM, William Linkmeyer via Boost wrote:
> This is interesting and helpful — yes!
>
> Although, it sounds like it’s more pertinent to software timers, right? 
>
> I’ve done some work with hardware RTCs, many of which drift by 4ms/day, 
> others by a few ms/year. (For physical quartz clocks, drift is a 
> function of temperature and crystal frequency.) 
>
> I had assumed that these clocks were more-or-less ubiquitous on 
> computers today. 

The drift you're noticing is software alright. The perceived inaccuracy isn't with the hardware clocks employed. On the contrary. The clocks are the ~accurate reference point that allow you to observe the latency/jitter involved with scheduling threads at runners in your operating system.

This should be relatively obvious to you even before you asked the question: if you thought the actual clock is drifting, it would make it inspired to measure latencies.

>
> Anyway, best regards and thank you for your detailed response.
>
> WL
>
Seth