[Gllug] Moving processor between boxes

[Martin A. Brooks]

t.clarke wrote:
> Surely the whole point of SMP is the box can two two things simultaneously,
> not do one thing twice as fast?

For a unithreading program that's essentially true.  You can however run 
more instances on the program and set the affinity of each process to a 
different CPU. Assuming one instance per CPU, you will gain overall 
performance.

> Or have I got the wrong end of the stick completely?

Many applications these days are threaded, these can take advantage of 
dual processor and/or multicore processors to run concurrently on more 
than one CPU.  This is also sort of true for HT processors, but only 
"sort of".


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