[oi-dev] How many CPUs does OI support?

[Stephen Conley]

I seem to recall reading in a book cerca Solaris 10 about the kernel
internals that it supported UNSIGNED SMALL INT (about 65k) cores but I am
having a hard time finding anything to back that up and I gave that book
away in a donation pile many years ago so I can't double check easily.

I know my loose recollection isn't that helpful but it jives with the other
folks suggesting that the limit is way higher than BSD :)

On Fri, Jan 8, 2021 at 12:01 PM Chris <oidev at bsdos.info> wrote:

> On 2021-01-08 08:39, Andreas Wacknitz wrote:
> > Am 08.01.21 um 17:15 schrieb Chris:
> >> On 2021-01-08 01:17, Joshua M. Clulow via oi-dev wrote:
> >>> On Thu, 7 Jan 2021 at 23:53, Chris <oidev at bsdos.info> wrote:
> >>>> I'm looking to help building packages. Both current, as
> >>>> well as newer versions. I have a large server farm. But
> >>>> primarily BSD based. As such I'm looking into a new build
> >>>> box, based on an Opteron or Xeon. So before I take the
> >>>> plunge. I was hoping to add as many CPU/cores as possible.
> >>>> Which begs the question: haw many CPUs does OI support?
> >>>
> >>> I don't think you'll be able to buy a machine with more CPUs than we
> >>> support in illumos.  I've personally used older HP machines with 4 CPU
> >>> sockets and thus a lot of cores, and modern AMD systems which have a
> >>> still surprising number of cores in one or two packages.
> >>>
> >>> In the unlikely event that you hit a problem based on core count, I am
> >>> sure it will just be a bug that can be fixed.
> >> OK so 4 sockets @16 cores/ea, or 2 sockets @64 cores/ea won't be a
> >> problem then.
> >> Thanks for the reply! :-)
> >> Time to go shopping.
> >>
> >>
> >> --Chris
> >>>
> >>>
> >>> Cheers.
> >>
> > Tell us when your server exceeds 384 Cores / 3072 Threads. AFAIK that's
> > what actual Fujitsu/Oracle M12 provide at max. :D
> Sweeeeeet! :-)
> TBH the only reason I brought it up was that we had a similar question on
> one of the FreeBSD lists. Where they had difficulty exceeding 96 on a 128.
> I've forgotten whether it turned out to be config of (actual) limitation.
> Mind you that was BSD. But given the shared heritage, it seemed an
> appropriate question.
> Thanks for the stats. Maybe I should give Fujitsu a look. :-)
>
> --Chris
> >
> >
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>
> --
> ~40yrs of UNIX and counting
>
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