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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 05:50:26 -0700 (PDT)
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Date: 2009-09-04T05:50:26-07:00
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Olivier Scalbert wrote on comp.lang.ada:
> http://scalbert.dyndns.org/ada/knucleotide/callgrind_out_14048.txt

Let's see:

43,644,857,598  PROGRAM TOTALS
[...]

            .
----------------------------------------------------------------------------
            .     --
            .     --  Calculate and write data - either a percentage
for all fragments found or - when
            .     --  Nucleotide_Fragment is given - the count for
that fragment.
            .     --
  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. I wonder whether it is feasible to
pass access values to the strings.

--
Ludovic Brenta.