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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada Shootout program for K-Nucleotide (patches)
Date: Fri, 4 Sep 2009 09:38:46 -0700 (PDT)
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Date: 2009-09-04T09:38:46-07:00
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Georg Bauhaus wrote on comp.lang.ada:
> Georg Bauhaus schrieb:
>
> > Ludovic Brenta schrieb:
> >> Apparently, passing unconstrained strings to procedure Write involves
> >> allocations on the secondary stack which account for 20% of the entire
> >> execution time. That's hot spot #1.
>
> > Indeed, and this particular hot spot had been cooled down twice:
>
> > Step 1 - we replaced Bounded_String with our own Bounded_String
>
> > Step 2 - we replaced this new Bounded_String with plain
> > =A0constrained =A0strings of suitable fixed length (using generics)
>
> I should add that the current program spends much of its time
> in equality comparison of fragment strings,
> and then some in the hash function.
> So not only are the bounded_strings gone;
> Jonathan has also contributed a highly efficient hashing
> function and a cute string equality function.
>
> (As mentioned, to actually see the effects (of the current
> program), String_Fragments."=3D" should be a renaming of Equals.
> Operator subprograms seem to confuse the profiling programs,
> or am I missing some setting?)

So I gather that Olivier was profiling an old version of the program.
Correct?

--
Ludovic Brenta.