[Info-vax] Baremetal emulators, was: Re: Alpha emulator for OSX

[Johnny Billquist]

On 2016-02-09 18:40, Stephen Hoffman wrote:
> On 2016-02-09 14:32:06 +0000, Johnny Billquist said:
>
>> I totally understood what you said, Hoff. And that is all good points,
>> but like I said, it's a different can of worms. It has nothing to do
>> with real-time.
>
>
> Donno.   I don't see a particular difference.   Emulators and hardware
> can change timing.  Changing timing derails applications, whether it's a
> commercial application or some application with tighter requirements.
>   Seems to be different aspects of the same mess.   The same can of
> worms.    Maybe you presume OP was using the same definition of real
> time you're familiar with, or maybe the OP wasn't, or maybe the OP might
> not realize that this is a general issue with applications running on
> faster processors or emulated processors or Linux or not. I've presumed
> a more general usage of timing issues involving emulation here, and that
> and the usage of other operating systems are clearly an anathema to the
> sentiments of the sole arbiter of real-time here in the newsgroup, and
> for that I beg your forgiveness.   I shall do a dozen interrupts in a
> millisecond, using only ladder logic in a baroque PLC of your choice.
> Will that be sufficient penance for my transgressions of terminology?

Like I said, differences in timing are a source of issues. Certainly. 
But, as several people have pointed out, real time is a question of 
predictability.
It's a completely different mess, and we could go on for hours digging 
into details. I'm a bit surprised you do not seem to understand that 
these are two separate domains.

But there is no point in having an argument about it. Feel free to think 
what you want, and I'll do the same on my side.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol