>There's a general perception (or FUD?) in the Linux world that "Linux does
>not scale well beyond 4 processors" whatever that means- you should
>research this statement too as it might give you a few clues- I doubt
>however that the ability to choose which processes run on which
>processors is important to this question.
It's not FUD in the NT world, that's for sure - from the Citrix Metaframe
course I did (Citrix has a Linux client, so I don't have to run NT at home
anymore for PCAnywhere - YAY !!!), we did some testing of this and here's
rougly the results.
1 processor = 100%
Add second processor = approx 90% improvement
Add third processor = approx 70% improvement
Add fourth processor = approx 50% improvement
When you go beyond 4 processors, the percentage improvement over the
previous configuration drops exponentially. There is a manufacturer in the
USA that supplies an 8 processor system - projected performance increace
adding the 8th processor is in the order of 5 - 7%.
And at the cost of processors these days, why bother !!
Linux, on the other hand (so I believe) scales to 4 processors quite well,
and the drop-off beyond that is still there, but no-where what NT experiences.
Performance increase / cost-of-processor = a waste of money (imho).
Jon
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