From: "H. Peter Anvin" <hpa@zytor.com>
To: Christopher Li <git@chrisli.org>
Cc: git@vger.kernel.org
Subject: Re: Yet another base64 patch
Date: Wed, 13 Apr 2005 22:36:52 -0700 [thread overview]
Message-ID: <425E0174.4080404@zytor.com> (raw)
In-Reply-To: <20050414022413.GB18655@64m.dyndns.org>
Christopher Li wrote:
> On Wed, Apr 13, 2005 at 09:19:48PM -0700, H. Peter Anvin wrote:
>
>>Checking out the total kernel tree (time checkout-cache -a into an empty
>>directory):
>>
>> Cache cold Cache hot
>>stock 3:46.95 19.95
>>base64 5:56.20 23.74
>>flat 2:44.13 15.68
>
>>It seems that the flat format, at least on ext3 with dircache, is
>>actually a major performance win, and that the second level loses quite
>>a bit.
>
> That is not surprising due to the directory index in ext3. Htree is pretty
> good at random access and the hashed file name distribute evenly, that is
> the best case for htree.
>
Right, so by not trying to do the filesystem's job for it we actually
come out ahead.
-hpa
next prev parent reply other threads:[~2005-04-14 5:36 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-14 4:19 Yet another base64 patch H. Peter Anvin
2005-04-14 2:24 ` Christopher Li
2005-04-14 5:36 ` H. Peter Anvin [this message]
2005-04-14 2:42 ` Christopher Li
2005-04-14 6:27 ` H. Peter Anvin
2005-04-14 6:35 ` H. Peter Anvin
2005-04-14 7:40 ` Linus Torvalds
2005-04-14 16:58 ` H. Peter Anvin
2005-04-14 17:42 ` Linus Torvalds
2005-04-14 19:11 ` bert hubert
2005-04-14 19:25 ` H. Peter Anvin
2005-04-14 21:47 ` bert hubert
2005-04-15 0:44 ` Linus Torvalds
2005-04-15 1:06 ` H. Peter Anvin
2005-04-17 4:10 ` David Lang
2005-04-18 6:23 ` H. Peter Anvin
2005-04-15 1:07 ` H. Peter Anvin
2005-04-15 3:58 ` Paul Jackson
2005-04-17 3:53 ` David A. Wheeler
2005-04-17 4:05 ` Paul Jackson
2005-04-17 6:38 ` David A. Wheeler
2005-04-17 8:16 ` Paul Jackson
2005-04-17 17:51 ` David A. Wheeler
2005-04-17 18:19 ` Petr Baudis
2005-04-18 5:13 ` David A. Wheeler
2005-04-18 12:59 ` Kevin Smith
2005-04-18 16:42 ` David A. Wheeler
2005-04-17 14:30 ` Daniel Barkalow
2005-04-17 16:29 ` David A. Wheeler
2005-04-14 4:25 ` H. Peter Anvin
2005-04-14 8:17 ` Linus Torvalds
2005-04-14 17:02 ` H. Peter Anvin
2005-04-15 23:55 ` Paul Dickson
2005-04-18 6:28 ` H. Peter Anvin
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