From: Maciej Sobczak <see.my.homepage@gmail.com>
Subject: Re: Reserve_Capacity for Unbounded_String?
Date: Wed, 25 Jul 2007 13:37:24 -0700
Date: 2007-07-25T13:37:24-07:00 [thread overview]
Message-ID: <1185395844.104043.194340@o61g2000hsh.googlegroups.com> (raw)
In-Reply-To: <f886vf$gie$1@jacob-sparre.dk>
On 25 Lip, 21:08, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
> > If you double the allocation every time, it's amortized linear.
> > Yes, you waste some space that way.
>
> Quadratic allocation maximizes heap fragmentation
Then instead of doubling the allocation use any multiplier that is
smaller than 1.618 (yes, the golden ratio).
1.5 seems to be easy choice.
Building a string by appending small chunks to the end seems to be a
common practice. Optimizing the library for this case is a wise
implementation strategy.
> I still don't think it is worth it, but obviously a customer example could
> change my mind.
What about a customer who is choosing the competing product? Doesn't
sound convincing enough?
--
Maciej Sobczak
http://www.msobczak.com/
next prev parent reply other threads:[~2007-07-25 20:37 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-22 19:54 Reserve_Capacity for Unbounded_String? Maciej Sobczak
2007-07-22 21:32 ` Robert A Duff
2007-07-23 19:29 ` Maciej Sobczak
2007-07-23 20:30 ` Robert A Duff
2007-07-23 4:28 ` Jeffrey R. Carter
2007-07-23 15:07 ` Adam Beneschan
2007-07-24 1:01 ` Randy Brukardt
2007-07-24 7:57 ` Pascal Obry
2007-07-24 18:58 ` Randy Brukardt
2007-07-24 23:50 ` Robert A Duff
2007-07-25 0:00 ` Randy Brukardt
2007-07-24 23:54 ` Pascal Obry
2007-07-25 0:52 ` Randy Brukardt
2007-07-25 1:28 ` Randy Brukardt
2007-07-25 7:48 ` Pascal Obry
2007-07-25 9:55 ` Georg Bauhaus
2007-07-25 10:02 ` Georg Bauhaus
2007-07-25 18:58 ` Randy Brukardt
2007-07-25 8:50 ` Martin Krischik
2007-07-25 9:26 ` AW: " Grein, Christoph (Fa. ESG)
2007-07-25 15:32 ` Martin Krischik
2007-07-25 15:39 ` Martin Krischik
2007-07-24 23:41 ` Robert A Duff
2007-07-25 0:16 ` Randy Brukardt
2007-07-25 2:25 ` Robert A Duff
2007-07-25 6:07 ` Simon Wright
2007-07-25 19:08 ` Randy Brukardt
2007-07-25 20:37 ` Maciej Sobczak [this message]
2007-07-25 22:06 ` Georg Bauhaus
2007-07-26 6:24 ` Maciej Sobczak
2007-07-26 8:09 ` Dmitry A. Kazakov
2007-07-26 8:20 ` Pascal Obry
2007-07-26 9:59 ` Dmitry A. Kazakov
2007-07-26 8:35 ` Georg Bauhaus
2007-07-26 22:11 ` Randy Brukardt
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