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From: Martin <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada Shootout program for K-Nucleotide (patches)
Date: Fri, 4 Sep 2009 10:56:59 -0700 (PDT)
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Date: 2009-09-04T10:56:59-07:00
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On Sep 4, 1:50=A0pm, Ludovic Brenta <ludo...@ludovic-brenta.org> wrote:
> Olivier Scalbert wrote on comp.lang.ada:
>
> >http://scalbert.dyndns.org/ada/knucleotide/callgrind_out_14048.txt
>
> Let's see:
>
> 43,644,857,598 =A0PROGRAM TOTALS
> [...]
>
> =A0 =A0 =A0 =A0 =A0 =A0 .
> -------------------------------------------------------------------------=
---
> =A0 =A0 =A0 =A0 =A0 =A0 . =A0 =A0 --
> =A0 =A0 =A0 =A0 =A0 =A0 . =A0 =A0 -- =A0Calculate and write data - either=
 a percentage
> for all fragments found or - when
> =A0 =A0 =A0 =A0 =A0 =A0 . =A0 =A0 -- =A0Nucleotide_Fragment is given - th=
e count for
> that fragment.
> =A0 =A0 =A0 =A0 =A0 =A0 . =A0 =A0 --
> =A0 262,499,981 =A0 =A0 procedure Write
> 8,251,549,172 =A0=3D> ???:system__secondary_stack__ss_mark (7x)
> =A0 =A0 =A0 =A0 =A0 =A0 . =A0 =A0 =A0 (Nucleotide_Length =A0 : in Frequen=
cies;
> =A0 =A0 =A0 =A0 =A0 =A0 . =A0 =A0 =A0 =A0Nucleotide_Fragment : in Fragmen=
t :=3D
> Fragments.Null_Bounded_String)
> =A0 =A0 =A0 =A0 =A0 =A0 . =A0 =A0 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.

I'm not familiar with this tool but if 'big numbers' for innocuous
looking code is to be checked then what about:

            .           function Get_Key (E : Element_Access) return
Fragment is
            .           begin
1,395,255,084              return E.all.Key;

Is there some accessibility check going on in this? Could a 'pragma
Assert (E.all /=3D null);' help?

Cheers
-- Martin