Intel Performance question. 3.0 GHZ P4 versus 3.2 GHZ P4

Joined: 9 Feb 05
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I should think the answer to

I should think the answer to all these questions would be blindingly simple for anyone to recognize....

Its the Fortran.

Why, if this had been written in some real language like...oh...I don't know...maybe...C or would be nice and speedy ;)

Paul D. Buck
Paul D. Buck
Joined: 17 Jan 05
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> Precisely!! No argument

Message 9515 in response to message 9513

> Precisely!! No argument from me on all of this paragraph. But I'm afraid
> it's simply not relevant to the case we are discussing. Here, there are two
> boxes and zero hardware changes are being made. The one change that is being
> reported on, in each case, is the software application, E@H vs S@H.
> You would think that whichever box runs E@H faster would also run S@H faster,
> wouldn't you?? But there is an unusually large reversal of performance and
> that is what intrigues me. Only the person who posted the relative times can
> really throw more light on this apparent conundrum.

Not quite my point.

All of the hardware/software has to be identical with only one difference. In this case the size of the cache. If there are any other differences then you cannot use the two machines to make the comparison.

This is why it is best if you have one machine in which you plug one processor. Make the test, then change only the CPU and rerun the test. Otherwise, there is no telling what other differences might be, and how they skew the results.

In the cases of comparing the CPUs, they also should be from the same generation and stepping or other internal changes also may affect the results. Anyway, it is not easy ...

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