[TUHS] SMP: BSD vs System V (once was: moving directories in svr2)

[Kevin Bowling]

On Mon, Jan 3, 2022 at 5:03 PM Greg 'groggy' Lehey <grog at lemis.com> wrote:

> On Monday,  3 January 2022 at 15:44:11 -0800, Larry McVoy wrote:
> > On Mon, Jan 03, 2022 at 05:21:51PM -0600, Doug McIntyre wrote:
> >> On Mon, Jan 03, 2022 at 04:15:08PM -0500, Dan Cross wrote:
> >> I'd agree, 2.4 was pretty slow and chunky, 2.5 was alright, but 2.5.1
> was quite usable and stable.
> >> Also by this time, the hardware was going in directions that SunOS
> wouldn't keep up with.
> >
> > Yeah, Doug is right, SunOS was pretty simple, it didn't really take
> advantage
> > of SMP, Greg Limes tried to thread it but it was too big a job for one
> guy.
> >
> > That's not to say that SunOS couldn't have evolved into SMP, I'm 100%
> > sure it could have.  It just didn't.  It's a shame.
>
> An interesting question.  I had always thought that SMP was (one of?)
> the technical reasons why Sun moved from a BSD to a System V base.
> Since then, of course, we've done lots of work on SMP support for at
> least FreeBSD.  Does anybody have an overview of how good the support
> is compared to modern Solaris?  Is there any intrinsic reason why one
> should be better than the other?
>
> Greg
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Relevant proceedings
https://www.usenix.org/legacy/publications/library/proceedings/sa92/
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