[K12OSN] 8 GB RAM on 32-bit Edubuntu with AMD 64 processors

[James P. Kinney III]

On Tue, 2007-11-27 at 20:39 -0800, Robert Arkiletian wrote:
> On Nov 27, 2007 1:40 PM, James P. Kinney III
> <jkinney at localnetsolutions.com> wrote:
> > Plus, the controller chip may artificially allocate a semi-dedicated
> > chunk of RAM to each core further masking the PAE swap effects. With
> > Opteron systems since each CPU is it's own RAM manager, the PAE issue is
> > further diluted. So far what I've seen is the PAE effect is most
> > pronounced where you'd expect it - on a single 32-bit CPU system with
> > large RAM installed.
> > >
> 
> You talk about NUMA.
> 
> This is the BEST in-depth article about memory I have seen. It was
> recently written by Ulrich Drepper.
> 
> http://lwn.net/Articles/250967/

Wow! Excellent! Many thanks for the link, Robert. 

A side effect of SMP and the associated numa challenges may result in a
better processor-affinity system for the Linux kernel. Currently,
processor affinity must be compiled into each application which makes it
non-portable. The new "totally fair scheduling" only accounts for load
and not the total cost of relocation. If a pa-mode can be developed that
actually works, then a multi-chip, multi-core system can keep the
firefox process running on a single core and only allow it's threads to
run on other cores on the same chip. That will provide a substantial
performance boost as the cost of relocating the parent thread and all
the associated RAM is now moot.

While I understand the technology, I sure don't code that stuff. :(
> 
> -- 
> Robert Arkiletian
> Eric Hamber Secondary, Vancouver, Canada
> Fl_TeacherTool http://www3.telus.net/public/robark/Fl_TeacherTool/
> C++ GUI tutorial http://www3.telus.net/public/robark/
> 
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-- 
James P. Kinney III          
CEO & Director of Engineering 
Local Net Solutions,LLC        
770-493-8244                    
http://www.localnetsolutions.com

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
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