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List:       gentoo-dev
Subject:    Re: [gentoo-dev] Realistic AT goals [WAS] Re: Bugzilla isn't just
From:       Jan_Kundrát <jkt () flaska ! net>
Date:       2005-07-20 17:57:02
Message-ID: 42DE906E.3030002 () flaska ! net
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Robin H. Johnson wrote:
> On Wed, Jul 20, 2005 at 10:32:29AM -0700, Donnie Berkholz wrote:
> 
>>Duncan wrote:
>>| The AT guidelines (available for amd64 ATs here:
>>| http://www.gentoo.org/proj/en/base/amd64/tests/index.xml ) specifically
>>| mention testing "every conceivable permutation",
>>That's an absolute joke for reasonably large packages with say, >=10 USE
>>flags. I had to look up my combinations math, but it looks like you're
>>already into thousands of possibilities with even 10 flags.
> 
> For PHP with 41 flags (98 in current revisions of PHP5), the numbers
> make it simply impossible to test every combination.

10 flags -> 2^10 -> 1024
41 flags -> 2^41 -> 2 199 023 255 552
98 flags -> 2^98 -> 316 912 650 057 057 350 374 175 801 344

Enjoy :-)

-jkt

-- 
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