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Date: Thu, 06 Aug 2009 00:31:00 +0200
From: Georg Bauhaus <rm.tsoh.plus-bug.bauhaus@maps.futureapps.de>
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Newsgroups: comp.lang.ada
Subject: Re: Ada Shootout program for K-Nucleotide (patches)
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Date: 2009-08-06T00:31:02+02:00
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Ludovic Brenta wrote:
> Georg Bauhaus wrote on comp.lang.ada:
>> +    procedure Print (Item : String) is
>> +       Data : char_array renames To_C (Item & ASCII.LF);
>> +    begin
>> +       if fputs (Data'Address, stdout) < 0 then
>> +          raise Ada.IO_Exceptions.Device_Error;
>> +       end if;
>> +    end Print;
> 
> I'm curious to know how the following performs:
>
> Stdout : constant Ada.Text_IO.Text_Streams.Stream_Access :=
>   Ada.Text_IO.Text_Streams.Stream (Ada.Text_IO.Standard_Output);
> 
> procedure Print (Item : String) is
> begin
>    String'Write (Stdout, Item);
>    Character'Write (Stdout, ASCII.LF);
> end Print;


Terribly slow.  Requesting only a tenth of the required amount
(i.e. N = 2500000) has taken ~30s. By extrapolation the full
set is produced only after ~5m. That's almost 20x slower
than the original Ada.Text_IO.

(The RM explains that String'Write calls procedure
Character'Write for each component of the String...)