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Date: Fri, 04 Sep 2009 18:29:49 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Newsgroups: comp.lang.ada
Subject: Re: Ada Shootout program for K-Nucleotide (patches)
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Date: 2009-09-04T18:29:49+02:00
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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
>  constrained  strings 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."=" should be a renaming of Equals.
Operator subprograms seem to confuse the profiling programs,
or am I missing some setting?)