From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
Subject: Re: Q: Line_IO
Date: Tue, 01 Sep 2009 11:55:22 +0200
Date: 2009-09-01T11:55:22+02:00 [thread overview]
Message-ID: <4a9cef8a$0$30222$9b4e6d93@newsspool1.arcor-online.net> (raw)
In-Reply-To: <56e70160-3e24-4bd0-be49-99999c191522@e34g2000vbm.googlegroups.com>
Ludovic Brenta schrieb:
> Georg Bauhaus wrote on comp.lang.ada:
>> BUFSIZ: constant := 8_192;
> [...]
>> SL : constant Natural := Separator_Sequence'Length;
>> subtype Extended_Buffer_Index is Positive range 1 .. BUFSIZ + SL;
>
> Since BUFSIZ is obviously chosen as an integral number of hardware
> memory pages, the extended_buffer uses two pages plus two bytes. How
> about allocating a buffer of BUFSIZ bytes and using only BUFSIZ-SL for
> the string and the remaining SL bytes for the terminator?
I had made the buffer have BUFSIZ + Separator_Sequence'Length
elements because Stream_IO.Read would then have BUFSIZ bytes
into which to store its data. I was only guessing that this
would matter; indeed, it is somewhat faster than using BUFSIZ = 128.
But growing beyond 8192 did not have an effect. I'll try others.
Another thing:
The names look bit bulky, at least from a "molecular source
pattern" matching point of view. But I can't produce better
short and meaningful names that are still Ada. Is it enough
to add a few empty lines? Ideas welcome.
next prev parent reply other threads:[~2009-09-01 9:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4a9b045a$0$31875$9b4e6d93@newsspool3.arcor-online.net>
2009-08-31 8:28 ` Q: Line_IO Martin
2009-08-31 10:05 ` Georg Bauhaus
2009-08-31 15:33 ` Anh Vo
2009-08-31 16:52 ` Georg Bauhaus
2009-08-31 18:39 ` Dmitry A. Kazakov
2009-08-31 22:51 ` Robert A Duff
2009-09-01 0:35 ` Georg Bauhaus
2009-08-31 23:56 ` Georg Bauhaus
2009-09-01 0:19 ` Georg Bauhaus
2009-09-01 1:08 ` Robert A Duff
2009-09-01 7:02 ` Ludovic Brenta
2009-09-01 9:55 ` Georg Bauhaus [this message]
2009-09-01 12:03 ` jonathan
[not found] ` <4a9e2c86$0$30235$9b4e6d93@newsspool1.arcor-online.net>
2009-09-02 8:47 ` Georg Bauhaus
2009-09-05 20:30 ` Georg Bauhaus
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