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From: Alexey Tourbin <at@altlinux.ru>
To: ALT Devel discussion list <devel@altlinux.org>
Subject: [devel] Re: cmdcache
Date: Wed, 14 Sep 2005 21:10:04 +0400
Message-ID: <20050914171004.GO3290@solemn.turbinal.org> (raw)
In-Reply-To: <20050914163854.GD9602@osdn.org.ua>

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On Wed, Sep 14, 2005 at 07:38:54PM +0300, Michael Shigorin wrote:
> > Нет, это про ~/.cmdcache/rpmfile, в котором число кеш-файлов
> > будет не меньше числа rpm пакетов в Sisyphus/files.
> > С %_sourcedir меня всё устраивает.
> Структурировать по первым буквам?

Букв нет, есть только st_ino+st_size+st_mtime.

at@solemn ~/.cmdcache 4 $ ls -1 rpmfile |head
i10003s62465m1079085926
i10226s323862m1079960217
i10287s367587m1080138012
i10366s1535556m1077197737
i10552s68368m1077197738
i10580s107898m1078145421
i10723s828128m1076422307
i1090192s13734m1125334673
i11055s406941m1079109059
i1166331s4611m1125335339
at@solemn ~/.cmdcache 4 $

К тому же по буквам получится плохое распределение, а кеш всё равно
"не прозрачный" (то есть reverse lookup затруднён).  Можно сделать
одноуровневую прослойку из каталогов по последним цифрам ino и size.
Получится 100 файлов на 100 каталогов для 10k capacity.  Надо посмотреть
как в ccache сделано.

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  reply	other threads:[~2005-09-14 17:10 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-12 11:35 [devel] cmdcache Alexey Tourbin
2005-09-12 13:05 ` [devel] cmdcache Alexey Tourbin
2005-09-12 13:34   ` Dmitry V. Levin
2005-09-12 14:01     ` Alexey Tourbin
2005-09-12 14:57     ` [devel] [JT] " Michael Shigorin
2005-09-12 18:35       ` [devel] " Alexey Tourbin
2005-09-13  5:21     ` [devel] " Alexey Tourbin
2005-09-14 15:35       ` Alexey Tourbin
2005-09-14 15:47         ` Michael Shigorin
2005-09-14 16:12           ` Alexey Tourbin
2005-09-14 16:38             ` Michael Shigorin
2005-09-14 17:10               ` Alexey Tourbin [this message]
2005-09-15  9:26                 ` [devel] Re: cmdcache hash function Alexey Tourbin
2005-09-15 14:37                   ` Alexey Tourbin

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