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

[Johnny Billquist]

On 2023-05-13 02:18, Arne Vajhøj wrote:
> On 5/12/2023 8:41 AM, bill wrote:
>> On 5/12/2023 8:14 AM, Simon Clubley wrote:
>>> On 2023-05-12, Jan-Erik Söderholm <jan-erik.soderholm at telia.com> wrote:
>>>> Actually, that was how I thought it worked. Since I observed that
>>>> the clock in my VirtualBox VMS environment lagge a bit behind
>>>> but each 10-20 sec, it jumpt ahead and skipped a second so that
>>>> it become in sync with the host Windows environment again.
>>>
>>> That's going to make for some "interesting" real-time program 
>>> behaviour... :-)
>>
>> Does VMS still claim to be an RTOS?  Did it ever (there was VAXELN)?
> 
> I don't think it ever has.

I think it claimed/aimed at soft realtime.

> But 30 years ago most believed that VMS had better
> real time characteristics than Unix.

It still do. Unix is way worse. That's why you have these real time 
extensions to Linux. With those, you are getting acceptable soft 
realtime in Linux as well, but at the cost of not having a Unix-like API 
for those parts...

   Johnny