Re: Fortran vs. C++ : Which is best to choose now i

From: Tom Micevski (none_at_none.au)
Date: 02/10/04 

Date: Tue, 10 Feb 2004 21:45:34 +1100

E. Robert Tisdale wrote:
> Are these your best or worst times?
> If you want to know whether your results are *significant* or not
> you should make several (about 30) runs
> and calculate the average and standard deviation for both times.

based on 10 runs:
* total time
auto = 7.039 (0.066)
alloc = 7.404 (0.077)
rand = 5.033 (0.040)
i would say that's *significant*.

* time calc'ing sum
auto = 2.005 (0.070)
alloc = 2.371 (0.061)
i would say that's *significant*.

> For completeness, please report the optimization options
> that you chose to use for this benchmark.

standard cvf "release" optimisations (/optimize:4)

redone with (/optimize:5)
12 runs:
* time calc'ing sum
auto = 2.026 (0.047)
alloc = 1.966 (0.060)
i would say that's *not significant* (although alloc seems faster).

> You could make a stronger argument for the validity of your calculation
> if you could actually elide the random number calculations

that's the whole point of me subtracting the time spent in the random_number loop (and doing the "time calc'ing sum" calcs).

> In actual applications, where you actually compute something
> (besides random numbers fro example) this ratio falls into the noise --
> you can't make a meaningful measurement.
>
that's what seems to happen with /optimize:5 (but not with /optimize:4).

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