[TUHS] A/UX [was Linux is on-topic]

[Clem Cole]

On Mon, Jul 20, 2020 at 7:51 AM Larry McVoy <lm at mcvoy.com> wrote:

> This isn't quite the same but Victor Yodaiken wrote a real time kernel
> that ran all of Linux as a user process.  Super cool idea and it worked
> great, he would demo it sampling the parallel port while Linux was running
> some X11 perf thing, tarring up /usr and untarring on nfs://server/tmp/usr
> and doing a ftp transfer.  Basically beating the crap out of Linux as
> hard as he could while running a real time sampler and it never missed.
>
> Clem should pay attention, in my opinion, this is how you do Unix and
> real time.  Because Unix is time sharing and throughput, that is the
> opposite of what real time is.  Wedging real time into Unix is a mistake.
>
> http://mcvoy.com/lm/papers/rtlmanifesto.pdf

As often true, I really don't disagree with you.  Around the time I left
Masscomp for Stellar we were working on a rewrite with some ex-CMU folks
(Doug ... I don't remember is his last name now) that used a preemptive RT
microkernel under the covers and then supplied RTU system calls.  Tom and I
left for Stellar and a couple of other people left too.  This was time of
the reign of Mr. Potato Head (ex-IBM guy that was named CEO) and things
blew up.
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