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From: Johannes Sixt <j.sixt@viscovery.net>
To: Antriksh Pany <antriksh.pany@gmail.com>
Cc: David Aguilar <davvid@gmail.com>,
	gitster@pobox.com, git@vger.kernel.org, markus.heidelberg@web.de,
	jnareb@gmail.com
Subject: Re: [PATCH v3 1/2] compat: add a mkstemps() compatibility function
Date: Tue, 02 Jun 2009 15:05:05 +0200	[thread overview]
Message-ID: <4A252381.9000103@viscovery.net> (raw)
In-Reply-To: <e6cd6cf90906020535m24d588eau40b800555c9e906f@mail.gmail.com>

Antriksh Pany schrieb:
> 2. tv_usec has a decimal value range of 0-999999  (10^6 usec make 1
> sec). Which means that tv_usec fits completely in 20 bits (or less).
> (tv_usec << 16) yields a number that fits completely in 36 bits (or
> less). Max value of this number is 999999 * 2^16, or for convenience,
> about M = 10^6 * 2^16. This number (in the range of 0 to M) goes on to
> be divided by D=62^6. Also, M > D. Thus, there is about a  D / M * 100
> ~ 87 % probability of the division M / D working out to be zero. i.e,
> in 87% cases, the last division (v/= num_letters) will cause 'v' to
> become 0.

But this value (after the 6th division, mind you) is not used. v is used
the last time after the 5th division; at this time it still carries enough
randomness: 62^5 < 2^32.

-- Hannes

  reply	other threads:[~2009-06-02 13:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-28  9:43 [PATCH v3 1/2] compat: add a mkstemps() compatibility function David Aguilar
2009-05-28  9:43 ` [PATCH v3 2/2] diff: generate prettier filenames when using GIT_EXTERNAL_DIFF David Aguilar
2009-06-02 12:35 ` [PATCH v3 1/2] compat: add a mkstemps() compatibility function Antriksh Pany
2009-06-02 13:05   ` Johannes Sixt [this message]
2009-06-03 15:59     ` Antriksh Pany
2009-06-03 23:33       ` David Aguilar

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