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Re: maximum speedup bound on multi-core processors
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Re: maximum speedup bound on multi-core processors


  • Subject: Re: maximum speedup bound on multi-core processors
  • From: Bill Bumgarner <email@hidden>
  • Date: Sat, 31 Jan 2009 15:00:37 -0800

On Jan 31, 2009, at 2:48 PM, email@hidden wrote:
Can anyone tell me if the maximum speedup using parallel programming on
multicore processors is BOUNDED by:


(A) number of processers (as on a single core processor).

(B) number of processors X number cores / processor.

If each processor runs numCore threads SIMULTANEOUSLY the answer would be
(B).


If each procssor run numCore threads non-concurrently the answer is (A).

If anyone REALLY knows please help a frustrated cocoa developer out.

Of far more importance is the algorithm employed and, quite specifically, the dependencies between threads and exactly how the dependencies are managed.


The question above can only be specifically quantified if your threads operates in total isolation, do no simultaneous I/O, and there is absolutely nothing else running on the system.

In the real world, the algorithm itself will have far more to do with scalability than raw machine capabilities.

b.bum

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 >maximum speedup bound on multi-core processors (From: email@hidden)

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