Re: UNIX bench better on 2.2 than 2.4?

From: Mark Mielke (mark@mark.mielke.cc)
Date: Fri Mar 15 2002 - 05:56:59 EST

On Fri, Mar 15, 2002 at 11:44:51AM +0100, Jean-Eric Cuendet wrote:
> Yes, you are right for this one.
> But what impressed me is between Host2/Host3. One is a dual-866 with
> 2.4.16 and the other is mono-800 with 2.2.19. And the host3 with 2.2.19
> is ~7% better than Host2 (Not counting that Host3 has ~8% more CPU
> clock, which should have be ~15% better for Host2 vs Host3...)

There is no guarantee that UNIX bench is SMP-friendly, or even
designed to test an SMP machine. Single programs that make good use of
an SMP machine usually have to be designed very differently than a
traditional program designed for a single processor.

It is probably just luck that the numbers jump around.

Just because Unix bench performs better or worse, or not as better, on
an SMP machine, as a non-SMP machine, does not mean that the numbers
accurately effect the capabilities of a real-life application. Unless
specifically designed for the environment, it is even possible that the
numbers would not even come close.

mark 

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