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Date: Fri, 04 Sep 2009 18:22:07 +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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Xref: g2news2.google.com comp.lang.ada:8156
Date: 2009-09-04T18:22:08+02:00
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Ludovic Brenta schrieb:

>   262,499,981     procedure Write
> 8,251,549,172  => ???:system__secondary_stack__ss_mark (7x)
>             .       (Nucleotide_Length   : in Frequencies;
>             .        Nucleotide_Fragment : in Fragment :=
> Fragments.Null_Bounded_String)
>             .     is
> 
> 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)