[luau] hyperthreading facts

[MonMotha]

Robert Green wrote:
> I don't know much about Hyperthreading, but do the applications need
> to be specially optimized and/or recompiled for you to get
> performance increases, or will standard applications see these types
> of improvements just due to the CPU alone?
> 
> Thanks!
> 
> Rob

Anything that would benefit from SMP can potentially benefit from 
HyperThreading.  In other words, if your app is threaded (and the threads are 
doing different things, using different functions of the CPU), it can benefit.

You can also benefit if you're running more than one process (you are).  The 
kernel sees the HyperThreaded CPU as 2 CPUs and schedules between them 
appropriately.  However, the 2.5 series that's HyperThreading aware knows the 
limitations and benefits of hyperthreading (shared cache, etc).  Therefore, it 
will schedule according to this (especially useful in situations where you have 
more than one HyperThreading CPU).

--MonMotha

-- 
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