x86_64 in FC4?

Eric S. Raymond esr at thyrsus.com
Sat Feb 5 00:03:47 UTC 2005

eli.carter at exgate.tek.com <eli.carter at exgate.tek.com>:
> > Indeed.  I have a single Opteron 3400 that is cranking a measured 1.65 
> > times better performance than my previous machine on doclifter, my 
> > monster Python app -- which doesn't sound impressive until you 
> > consider that the previous machine was a 2-processor SMP with 1.8GHz 
> > Athlons.  So my real-world throughput is as good or (allowing for 
> > Amdahl's Law inefficiencies) better than what I'd get from a 6 GHz 
> > Athlon, if such a thing existed. 
> I was under the impression that the Python interpreter was serialized
> and thus unable to take good advantage of SMP systems.
> If that's the case, then you'd only be getting one of those 1.8GHz
> processors beating on 'doclifter'... and if that's the case, you'd be
> looking at a 3GHz Althon instead of 6GHz.

Hmm...you're probably mostly right about this.  The Python app would get 
some gain from background daemons and X traffic migrating to the other
processor, though.
		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

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