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Date: Wed, 19 Aug 2009 23:37:26 +0200
From: Georg Bauhaus <rm.tsoh.plus-bug.bauhaus@maps.futureapps.de>
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Subject: Re: Ada Shootout program for K-Nucleotide (patches)
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Date: 2009-08-19T23:37:29+02:00
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Martin wrote:

> Isn't there something that could be done about the lines:
> 
>       return Unbounded.To_String (Data_Buffer);
>    end Read;
> and
>    Buffer : constant String := Read;

As a first try, I'm playing with the lightweight bounded
strings package (from the program), which is generic in
Jonathan Parker's version;  since a C++ program uses a
large buffer, we might try this as well, i.e. instantiate
the package for large strings and replace Unbounded.Append
with our own Append, effectively reading directly into the
target string.

> ...not sure what the answer is (don't have a compiler / debugger to
> hand just now but it just looks like there's a copy too many in there
> somewhere...
> 
> Also, is using "Ada.Text_IO.Get_Line" particularly fast?

Stream_IO might be faster, but the rules say that we have to
read line-by-line.  Would we not end up reinventing a buffering
scheme for line oriented standard I/O?
(Could be of some general utility, anyway, I'd think.
GNAT seems to be using C library function wrappers for its
high speed reading.)