Hmmm, since the Covid knows about the hires clock on platforms with an instruction to access it, I could write quickly a machine code primitive version.  Sounds like fun.

_,,,^..^,,,_ (phone)

> On Feb 22, 2023, at 2:44 AM, Marcel Taeumel via Squeak-dev <squeak-dev at lists.squeakfoundation.org> wrote:
> 
> 
> Actually, the algorithm in #nanosecondsToRunHighRes: accounts for that, but variation can be significant...
> 
> Thus, I would not recommend using #nanosecondsToRun: but use #bench for that instead.
> 
> Best,
> Marcel
>> Am 22.02.2023 11:41:02 schrieb Marcel Taeumel <marcel.taeumel at hpi.de>:
>> 
>> FYI: It takes a notable amount of nanoseconds to even fetch the high-res clock value ...
>> 
>> [ String new ] bench
>> " '72,900,000 per second. 13.7 nanoseconds per run. 8.29834 % GC time.' "
>> 
>> Best,
>> Marcel
>>> Am 22.02.2023 11:39:44 schrieb Marcel Taeumel <marcel.taeumel at hpi.de>:
>>> 
>>> Time startUp: true.
>>> Time useHighResClockForTiming: true.
>>> Time nanosecondsToRun: [ String new ]." 3193 "
>>> 
>>>> Am 22.02.2023 11:27:55 schrieb commits at source.squeak.org <commits at source.squeak.org>:
>>>> 
>>>> Marcel Taeumel uploaded a new version of Chronology-Core to project Squeak 6.0:
>>>> http://source.squeak.org/squeak60/Chronology-Core-mt.81.mcz
>>>> 
>>>> ==================== Summary ====================
>>>> 
>>>> Name: Chronology-Core-mt.81
>>>> Author: mt
>>>> Time: 22 February 2023, 11:27:44.882528 am
>>>> UUID: e4a5b396-8917-7f46-a6c7-a6961ff588af
>>>> Ancestors: Chronology-Core-ct.80
>>>> 
>>>> Fixes #highResClock usage by resetting the estimated #highResClockTicksPerMillisecond on system start-up. The preference #useHighResClockForTiming works now as well.
>>>> 
>>>> =============== Diff against Chronology-Core-ct.80 ===============
>>>> 
>>>> Item was changed:
>>>> ----- Method: Time class>>startUp: (in category 'system startup') -----
>>>> startUp: resuming
>>>> 
>>>> resuming ifTrue: [
>>>> + LastClockTick := 0.
>>>> + HighResClockTicksPerMillisecond := 0 ]!
>>>> - LastClockTick := 0 ]!
>>>> 
>>>> Item was added:
>>>> + ----- Method: Time class>>useHighResClockForTiming: (in category 'preferences') -----
>>>> + useHighResClockForTiming: booleanOrNil
>>>> + 
>>>> + UseHighResClockForTiming := booleanOrNil.!
>>>> 
>>>> 
> 
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