Date: Tue, 15 Jun 2004 11:32:29 -0700
From: Paul Jackson <pj@sgi.com>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: ak@muc.de, linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net,
       anton@samba.org
Subject: Re: NUMA API observations
Message-Id: <20040615113229.054e02e2.pj@sgi.com>
In-Reply-To: <40CF33D6.80302@colorfullife.com>
References: <40CE824D.9020300@colorfullife.com>
	<20040615110320.GD50463@colin2.muc.de>
	<40CF33D6.80302@colorfullife.com>
Organization: SGI
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Manfred wrote:
> What's the largest number of cpus that are supported right now? 256?

Kernels for SGI's SN2 boxes are usually compiled with NR_CPUS == 512.
A quick grep of the default config files shows that is the largest.

> First call sysctl or whatever. If it fails, then glibc can assume 256. 

Yes, one _could_ write code such as that.

Spend a little time looking at what glibc has done so far with these
API's.  You will then doubt that the code you recommend would actually
happen consistently.  Be forewarned - if you are on anti-depressant
medications, make sure your prescription is filled first.

-- 
                          I won't rest till it's the best ...
                          Programmer, Linux Scalability
                          Paul Jackson <pj@sgi.com> 1.650.933.1373
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