On 1/31/22, envee wrote:
> Hi All,
> I understand this issue has been discussed in the past, and I have seen a
> few comments from Ian and Russ Cox about this topic, but I could not arrive
>
> at a conclusion about how I can make the time.Ticker send me ticks at
> atleast close to the Ticker duration I specify. At the moment, I am seeing
> ticks being sent at way over the specified duration especially when I have
> sub-millisecond durations.
> With 1ms duration, the ticker seems to be quite close to the duration
> (maybe within +/-5%). I would be happier if it were within 1%, but I can
> handle that.
>
> With 1 micro-second duration, the ticker sends ticks nearly 4 times slower
> than expected.
>
> Here is my sample code
> "
> ti := time.NewTicker(1 * time.Millisecond)
> start := time.Now()
> for i := 0; i < 1000; i++ {
> <-ti.C
> }
> fmt.Printf("elapsed time = %v\n", time.Since(start))
> "
>
> The output is usually close to 1 second as expected (close to) when using
> 1ms duration.
> elapsed time = 1.000159338s
>
> But when I change the Ticker duration to 1 micro-second, I get the
> following output which shows the elapsed time close to 4 seconds:
> elapsed time = 4.796662856s
> *Is there anyway, I can ensure ticks are sent at approximately within 5% of
>
> my specified duration ?*
>
> I understand from time.Ticker docs that ticks will be lost if the ticker
> handler cannot keep up with the ticker time.
>
> In the simple code above, I am literally doing very minimal work in each
> loop iteration and that is about checking the loop condition.
> So I am not sure why ticks are being lost ?
The answer probably depends on what you are interested in:
Why ~2000 cycles is not enough for scheduling the loop or
could ~2000 cycles be enough for scheduling the loop?
What do you think should happen if you change time.Microsecond to
time.Nanosecond?
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