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Date: Wed, 12 Aug 2015 17:20:03 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Somebody having access to a Windows machine with > 64 CPUs?
Message-ID: <20150812152003.GK13029@calimero.vinschen.de>
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References: <20150810160011.GC13029@calimero.vinschen.de> <6E689F0D-F196-4D1B-B6FA-782A27AF936C@etr-usa.com> <20150810165604.GE13029@calimero.vinschen.de> <87lhdjrs54.fsf@Rainer.invalid> <55CA37A1.4030704@sgi.com>
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On Aug 11 12:57, Brian J. Johnson wrote:
> On 08/10/2015 12:05 PM, Achim Gratz wrote:
> >Corinna Vinschen writes:
> >>I was referring to Windows 7 because that's the first OS (including
> >>it's 2008R2 server version) which supports more than 64 CPUs and the
> >>OS calls required to use and fetch info on them,
> >>GetLogicalProcessorInformationEx.
> >
> >I think the only practical use of this possibility might have been in
> >the HPC space.  I don't know anybody running such a system, though.
>=20
> In-memory databases also benefit from really large systems.  Lots of RAM
> requires lots of sockets, which bring along lots of cores.  Eg. http://ww=
w.sgi.com/company_info/newsroom/press_releases/2015/july/sap_hana.html
>=20
> I believe KVM will let you define a VM with > 64 CPUs, and recent versions
> provide some control over the NUMA layout of the virtual
> sockets/cores/threads.  Maybe that will give you what you're looking for,
> Corinna.

Nice idea and incidentally a collegue reminded me of this idea a couple
hours ago as well.  I tested this now locally and I got the results I'm
looking for (albeit they are a bit confusing).


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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