eli.carter(a)exgate.tek.com <eli.carter(a)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>