From: Dave Eckhardt <davide+p9@cs.cmu.edu>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] acme mail on unix
Date: Fri, 20 Jan 2006 18:01:03 -0500 [thread overview]
Message-ID: <4948.1137798063@piper.nectar.cs.cmu.edu> (raw)
In-Reply-To: <20060120135038.04867B095F@conchobor.berzerked.org>
> (the S=2872 is the file size. i'm not sure why stat is so
> expensive on their machine.)
I suspect it's *not* because of this: AFS directories
are (essentially) whole-file transferred to clients
who interpret them locally, but each stat() requires an
RPC to the server.
Instead my guess would be something more like: if you're
rebuilding the quota database you can do so by N/M
readdir()'s instead of N/M readdir()'s plus N stat()'s,
which is probably a huge reduction in disk seeks, which
would be attractive since almost everything stat() would
be telling you would be irrelevant (e.g., inode number,
permissions, actual disk blocks consumed).
Dave Eckhardt
next prev parent reply other threads:[~2006-01-20 23:01 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-18 16:46 Russ Cox
2006-01-18 17:56 ` Tim Wiess
2006-01-18 18:08 ` Tim Wiess
2006-01-18 19:10 ` Russ Cox
2006-01-19 16:17 ` Aaron Griffin
2006-01-19 16:24 ` Russ Cox
2006-01-19 21:28 ` Dan Cross
2006-01-19 21:58 ` Russ Cox
2006-01-20 2:38 ` geoff
2006-01-20 5:31 ` Scott Schwartz
2006-01-20 6:04 ` John Barham
2006-01-20 13:50 ` erik quanstrom
2006-01-20 23:01 ` Dave Eckhardt [this message]
2006-01-21 0:06 ` erik quanstrom
2006-01-20 13:58 ` erik quanstrom
2006-01-20 20:02 ` erik quanstrom
2006-01-20 20:12 ` uriel
2006-01-20 20:18 ` erik quanstrom
2006-01-20 20:41 ` uriel
2006-01-20 20:59 ` erik quanstrom
2006-01-20 22:58 Russ Cox
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