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Date: Tue, 11 Aug 2015 12:57:53 -0500
From: "Brian J. Johnson" <bjohnson AT sgi DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: Somebody having access to a Windows machine with > 64 CPUs?
References: <20150810160011 DOT GC13029 AT calimero DOT vinschen DOT de>	<6E689F0D-F196-4D1B-B6FA-782A27AF936C AT etr-usa DOT com>	<20150810165604 DOT GE13029 AT calimero DOT vinschen DOT de> <87lhdjrs54 DOT fsf AT Rainer DOT invalid>
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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.

In-memory databases also benefit from really large systems.  Lots of RAM 
requires lots of sockets, which bring along lots of cores.  Eg. 
http://www.sgi.com/company_info/newsroom/press_releases/2015/july/sap_hana.html

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.
-- 

						Brian J. Johnson

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