[Glass] Time and System millisecondsToRun

[Smalltalk at JGFoster.net]

Time class>>millisecondsElapsedTime: is measuring elapsed (“wall clock”) time, including time that other processes are running and the process is waiting for I/O or other tasks to finish. There is no method #millisecondsToRun: in Time.

System is measuring CPU time used by the process, excluding time waiting for semaphores.

> On Aug 27, 2020, at 2:15 PM, bruno buzzi brassesco via Glass <glass at lists.gemtalksystems.com> wrote:
> 
> Hi,
> 
> Why there is a difference answer in the following expressions ? (tested on GS 3.5.1 and 3.3.7)
> 
> Time millisecondsToRun: [(Delay forSeconds: 4) wait]. "answer 4000  -> computing the delay time "
> 
> System millisecondsToRun: [(Delay forSeconds: 4) wait]. "answer 0 -> NOT computing the delay time"
> 
> It seems a difference in how time is computed:
> System use primitive 178 and Time use primitive 13.
> 
> So Time check actual time difference while System check CPU time consumed then excluding delays.
> 
> regards,
> bruno
> 
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