Go GC

[Gary E. Miller]

Yo Hal!

On Tue, 12 Sep 2023 16:55:12 -0700
Hal Murray via devel <devel at ntpsec.org> wrote:

> Gary said:
> >James Browning via devel <devel at ntpsec.org> wrote:  
> >> It would appear there is a way to turn off GC under runtime/,  
> > How?  Link?   
> 
> https://pkg.go.dev/runtime/debug#SetGCPercent
> 
> It's not clear to me how to take advantage of that.  You still have
> to turn it on occasionally or your world will fill up with garbage.

Assuming you create garbage.  Avoiding creating garbage is hard.

> I poked around a bit.  I'm pretty sure that we can write a server
> that doesn't generate any garbage when processing a normal client
> request.

The problem is not when you generate garbage, but when the garbage
collector wakes up.

> Occasinally, there is something in the 60-70 microseconds range.
> They are rare enough that it's easy to miss one in a million sample
> pairs of reading the clock.

Which is why NTP slowly adjusts PLL's instead of jumping around.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

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    "If you can't measure it, you can't improve it." - Lord Kelvin
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