From: root@mauve.demon.co.uk
To: ecki@calista.eckenfels.6bone.ka-ip.net (Bernd Eckenfels)
Cc: linux-kernel@vger.kernel.org
Subject: Re: Lockless file readingu
Date: Fri, 29 Aug 2003 00:44:00 +0100 (BST) [thread overview]
Message-ID: <200308282344.AAA26603@mauve.demon.co.uk> (raw)
In-Reply-To: <E19sUna-0003Zq-00@calista.inka.de> from "Bernd Eckenfels" at Aug 28, 2003 11:59:22 PM
>
> In article <200308281726.SAA24033@mauve.demon.co.uk> you wrote:
> > I'd be really surprised if there were that many pictures in the world.
>
> Well, this is about probabilty. It does not mean that you need 2^64
> pictures, neighter does it mean you have a collision within 2^64 pictures.
Of course it dowesn't.
The probability gets rather smaller as numbers go down, and bigger as
they go up.
With 2^128 bits, the chance of a a collision between 2^64 randomly chosen
pictures is 50%.
At 2^54 pictures, it's about one in a million, and at 2^34 (enough for
several pictures of everyone alive) one in a billion billion.
At more common numbers of pictures (say 2^14) it becomes vanishingly
unlikely for anyone to have two matching pictures (even with several billion
archives)
next prev parent reply other threads:[~2003-08-28 23:49 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-27 12:37 Lockless file reading Timo Sirainen
2003-08-27 12:42 ` Martin Konold
2003-08-27 12:52 ` Timo Sirainen
2003-08-27 13:40 ` Richard B. Johnson
2003-08-27 14:56 ` Timo Sirainen
2003-08-27 23:39 ` Jamie Lokier
2003-08-28 0:52 ` Timo Sirainen
2003-08-27 18:42 ` Nagendra Singh Tomar
2003-08-28 8:40 ` Timo Sirainen
2003-08-27 21:15 ` Nagendra Singh Tomar
2003-08-28 9:35 ` Timo Sirainen
2003-08-27 21:52 ` Nagendra Singh Tomar
2003-08-28 13:26 ` Matthias Andree
2003-08-28 9:17 ` David Schwartz
2003-08-28 8:42 ` Valdis.Kletnieks
2003-08-28 20:13 ` David B. Stevens
2003-08-28 1:50 ` Jamie Lokier
2003-08-28 3:17 ` Timo Sirainen
2003-08-28 6:01 ` Valdis.Kletnieks
2003-08-28 6:13 ` Jamie Lokier
2003-08-28 8:57 ` Timo Sirainen
2003-08-28 9:56 ` David Schwartz
2003-08-28 10:26 ` Timo Sirainen
2003-08-27 22:58 ` Nagendra Singh Tomar
2003-08-28 12:18 ` Jamie Lokier
2003-08-28 0:39 ` Nagendra Singh Tomar
2003-08-28 13:00 ` Jamie Lokier
2003-08-28 1:06 ` Nagendra Singh Tomar
2003-08-28 21:49 ` Bernd Eckenfels
2003-08-28 12:01 ` Jamie Lokier
2003-08-28 13:28 ` Timo Sirainen
2003-08-28 20:24 ` David Schwartz
2003-08-28 12:44 ` Ragnar Hojland Espinosa
2003-08-28 13:03 ` Jamie Lokier
2003-08-28 17:26 ` root
2003-08-28 17:35 ` Jamie Lokier
2003-08-28 18:10 ` root
2003-08-28 21:59 ` Bernd Eckenfels
2003-08-28 23:02 ` Jamie Lokier
2003-08-28 23:44 ` root [this message]
2003-08-29 10:00 ` Lockless file readingu jlnance
2003-08-29 11:55 ` David Schwartz
2003-08-29 15:43 ` William Lee Irwin III
2003-08-28 20:37 ` Lockless file reading David Schwartz
2003-08-28 22:11 ` Bernd Eckenfels
2003-08-28 23:00 ` Jamie Lokier
2003-08-29 0:47 ` David Schwartz
2003-08-28 9:13 ` Martin Konold
2003-08-28 9:27 ` Timo Sirainen
2003-08-28 9:48 ` Martin Konold
2003-08-28 0:03 ` Jamie Lokier
2003-08-28 12:08 ` Richard B. Johnson
2003-08-28 12:39 ` Jamie Lokier
2003-08-28 10:08 ` Matthias Andree
2003-08-28 10:54 ` Robin Rosenberg
2003-08-28 12:42 ` Jamie Lokier
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