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[Gnu-arch-users] stat performance on AFS [was Re: [PATCH] arch speedups
From: |
Charles Duffy |
Subject: |
[Gnu-arch-users] stat performance on AFS [was Re: [PATCH] arch speedups on big trees] |
Date: |
Wed, 07 Jan 2004 02:02:08 -0600 |
On Wed, 2004-01-07 at 00:09, Miles Bader wrote:
> Charles Duffy <address@hidden> writes:
> > Depends on where you are. On AFS, for instance, stat() calls aren't
> > cached on the client, so they're potentially much slower (!) than
> > read()s; for that reason, checking the inode signatures is exceedingly
> > slow there, and so this optimization will be a very substantial gain.
>
> Does AFS not special-case stats of files that are in the cache?!?
Put it this way: Doing an inode-signature-based operation twice in a row
on our home network (in many respects a scaled-down model of the network
at work) results in quite a bit of a clatter from the AFS server both
times, whereas in the case of a read()-based operation done twice, the
second run has no server involvement at all.
"Files that are in the cache" is something of a misnomer -- the cache
contains chunks rather than complete files; hence, one can't simply stat
the cache's copy of the file and expect it to represent the correct
values.
- Re: [Gnu-arch-users] [PATCH] arch speedups on big trees, (continued)
- Re: [Gnu-arch-users] [PATCH] arch speedups on big trees, Miles Bader, 2004/01/06
- Re: [Gnu-arch-users] [PATCH] arch speedups on big trees, Chris Mason, 2004/01/06
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Miles Bader, 2004/01/06
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/07
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Miles Bader, 2004/01/07
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/07
- Re: [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Mark A. Flacy, 2004/01/07
- Re: [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/07
- Re: [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Charles Duffy, 2004/01/07
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Miles Bader, 2004/01/07
- [Gnu-arch-users] stat performance on AFS [was Re: [PATCH] arch speedups on big trees],
Charles Duffy <=
- [Gnu-arch-users] Re: stat performance on AFS [was Re: [PATCH] arch speedups on big trees], Miles Bader, 2004/01/07
- [Gnu-arch-users] Re: stat performance on AFS [was Re: [PATCH] arch speedups on big trees], Charles Duffy, 2004/01/07
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/07
- Re: [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/07
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Miles Bader, 2004/01/07
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/08
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Miles Bader, 2004/01/08
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/08
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Miles Bader, 2004/01/09
- [Gnu-arch-users] Re: [PATCH] arch speedups on big trees, Chris Mason, 2004/01/08