> Hi guys,
>
> Can you help clear up a misconception about SMP that I have at the
> moment?
>
> When two or more processors come into play, what is the increase rate of
> processing over a single processor? Is does it works out as 100% increase
> over that of a single processor or is it limited by other factors such as
> caching, disk i/o or whatever?
>
> I'm guessing it's a 100% increase.
>
> Cheers,
> Alex.
If you are not I/O bound, a two processor machine scales quite
nicely to give you very nearly two times the performance. However
adding additional pairs of processors does not scale linearily.
I don't remember the numbers, but basically you run into a wall
where additional processors don't do anything. I think, with
the current bus bandwidth, this wall is 8 processors.
If you are I/O bound, (many kinds of database programs) adding
additional processors don't help much.
Cheers,
Dick Johnson
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