[Info-vax] clock problems with OpenVMS x86 on VirtualBox

[Johnny Billquist]

On 2023-05-15 14:17, Jan-Erik Söderholm wrote:
>>
>> On 5/12/23 3:25 PM, Clair Grant wrote:
>>> Virtual Box 7.0.6, Lenovo ThinkBook, Windows 11
>>>
>>> I put SHOW TIME in a 10 minute loop and ran it 7 hours. Every
>>> output showed exactly 10 minutes and 0 seconds from the previous.
> 
> I'm not sure I fully understand how that test was done.
> 
> If you ask VMS to wait for 10 min and then ask VMS for the time
> passed, I would expect VMS to say that "10 min has passed", no
> matter how long those 10 min was in reallity.
> 
> Of course VMS in it self belives that 10 min has passed,
> it doesn't know better, so to speak.
> 
> Or, fully possible of course, I'm just missing something here... :-)

Ha! A very good point. The test don't actually prove anything. You are 
right. :-)

But if you were to compare to an external clock, I would suspect you 
would not see big deviations either, but I would expect there to be 
small glitches in the short timescale and if you look with enough 
resolution.

   Johnny