From: Fionn Mac Cumhaill <invisible@hiding.from.spam>
Subject: Re: Reading and writing a big file in Ada (GNAT) on Windows XP
Date: Sun, 29 Apr 2007 21:44:15 GMT
Date: 2007-04-29T21:44:15+00:00 [thread overview]
Message-ID: <pc4a33dg00mcne415ars443dfsa9gh5skg@4ax.com> (raw)
In-Reply-To: fcgcg4-fbs.ln1@newserver.thecreems.com
On Sat, 28 Apr 2007 14:28:56 -0400, Jeffrey Creem <jeff@thecreems.com>
wrote:
>Simon Wright wrote:
>> Fionn Mac Cumhaill <invisible@hiding.from.spam> writes:
>>
>>> The modifications consist of replacing a slice of text at the end of
>>> a line with another bit of text. The biggest slice is 10 characters,
>>> and the replacement slice is always smaller than the original
>>> slice. An occasional line of text is about 6000 characters long, but
>>> most are about 700 haracters. Get_Line reads them into a String
>>> variable that is 10,000 characters long.
>>
>> Yesterday I found a performance (and stack!) related problem in GNAT's
>> Ada.Strings.Fixed.Index. The string is mapped onto the stack before
>> the search is done. But I wouldn't have thought this would result in a
>> 5 hour run time. How do you decide which lines need conversion?
>
>I agree, it does not seem that either that or the guesses I had related
>to zeroing at the string (a common mistake) would result in the level of
>slowdown being seen...However, now that you mention it, I see a few ugly
>things like that related to Ada.Strings.Fixed. Did you submit a bug
>report to FSF GCC?
>
>
>As for the original poster, any chance you are doing dynamic memory
>allocation and leaking and perhaps causing swapping?
I didn't see any swapfile activity at all.
next prev parent reply other threads:[~2007-04-29 21:44 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-28 5:03 Reading and writing a big file in Ada (GNAT) on Windows XP Fionn Mac Cumhaill
2007-04-28 5:20 ` Gautier
2007-04-29 21:17 ` Fionn Mac Cumhaill
2007-04-28 5:25 ` tmoran
2007-04-28 6:56 ` Martin Krischik
2007-04-28 17:12 ` tmoran
2007-04-28 12:41 ` Jeffrey Creem
2007-04-29 21:35 ` Fionn Mac Cumhaill
2007-04-28 13:22 ` (see below)
2007-04-28 17:56 ` Simon Wright
2007-04-28 18:28 ` Jeffrey Creem
2007-04-29 7:20 ` Simon Wright
2007-04-29 21:44 ` Fionn Mac Cumhaill [this message]
2007-04-29 21:42 ` Fionn Mac Cumhaill
2007-04-30 0:48 ` Jeffrey R. Carter
2007-04-30 2:30 ` Fionn Mac Cumhaill
2007-04-30 4:21 ` tmoran
2007-04-28 19:12 ` Jeffrey R. Carter
2007-04-29 21:46 ` Fionn Mac Cumhaill
2007-05-01 14:10 ` Fionn Mac Cumhaill
2007-05-06 21:55 ` Quarc
2007-05-02 7:46 ` george
2007-05-03 6:31 ` Fionn Mac Cumhaill
2007-05-03 20:00 ` Simon Wright
2007-05-04 4:35 ` Jeffrey R. Carter
2007-05-04 4:45 ` Fionn Mac Cumhaill
2007-05-04 6:53 ` Alternative Index implementation? (Was: Reading and writing a big file in Ada (GNAT) on Windows XP) Jacob Sparre Andersen
2007-05-04 7:41 ` Dmitry A. Kazakov
2007-05-04 9:16 ` Copying string slices before calling subroutines? (Was: Alternative Index implementation?) Jacob Sparre Andersen
2007-05-04 9:44 ` Copying string slices before calling subroutines? Jacob Sparre Andersen
2007-05-04 10:14 ` Dmitry A. Kazakov
2007-05-04 12:07 ` Jeffrey Creem
2007-05-04 12:46 ` Dmitry A. Kazakov
2007-05-04 22:27 ` Simon Wright
2007-05-05 7:33 ` Jacob Sparre Andersen
2007-05-05 7:47 ` Dmitry A. Kazakov
2007-05-05 7:41 ` Dmitry A. Kazakov
2007-05-03 20:27 ` Reading and writing a big file in Ada (GNAT) on Windows XP Adam Beneschan
2007-05-03 23:01 ` Randy Brukardt
2007-05-04 0:28 ` Markus E Leypold
2007-05-05 16:26 ` Adam Beneschan
2007-05-05 17:27 ` Markus E Leypold
2007-05-15 23:03 ` Randy Brukardt
2007-05-04 20:04 ` Adam Beneschan
2007-05-05 16:36 ` tmoran
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