Re: NetBSD/vax vm for github testing

On 2025-01-11 16:24, Mouse wrote:
>> But it becomes a hard problem with simulations, since the code in RSX
>> is also assuming that all CPUs are executing all the time, and
>> simulation normally don't do that to the level required.  Bursty
>> behavior becomes a real problem in this context. On a single-cpu
>> machine, that is very much a non-problem.
> 
> I'd think a single-CPU machine would make it even more of a problem.
> On a multiprocessor, the emulation can (whether explicitly or not) give
> each emulated CPU its own real CPU, so the emulated cores _are_ all
> executing at the same time.  But on a single-CPU machine, the closest
> you're likely to get is for the emulation to alternate between cores.

You misunderstood. I meant a single-CPU emulated CPU. Not at all 
connected to how many CPUs the host system have.
I agree with your thought that a multi-core host system have a better 
chance at making it work, but my experience have been that it's not even 
close to good enough for at least MP PDP-11 systems. It's just too 
unpredictable when the different emulated CPUs actually will be running.

   Johnny

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