[OpenAFS] OpenAFS directory update is SLOW. Performance tuning?

Tue, 9 Apr 2002 12:40:02 -0700

Hmmm... Maybe the difference in time is due to a large number of files?
Could you try
find . | wc?

The first time I did the update, it took 3 minutes.  The second try was 1.5
minutes under WinXP.

My AFS server is a PII-200, 64Mb, Linux-2.4.18, RedHat-7.2.  My client is a
PIII-900, 750Mb, WinXP.  The network is 10Mb ethernet.

My CVS repository remote over SSH (200Mb cable modem).  I'm running CVS over
ssh while in a directory in AFS under WinXP and Linux.  My CVS repository is
not on AFS.  Are you using SSH to get to your repository, or is your
repository under AFS as well?

(time passes...)

I've done some more tests, and found some results:

1. CVS update is much faster under Linux: 13 sec.  Update on a direct local
HD is 8 sec.

2. Update under WinXP is still really slow at 1.5 minutes.  OpenAFS is
implemented as a network share under Windows rather than a kernel-level
filesystem as it is under Linux.  Is that where the slowdown is?

3. Unrelated to performance: CVS line endings are a pain when files are
shared between WinXX and Linux.  If you check out under Windows, then update
under Linux, CVS will think all the files are changed because their lines
now end with CRLF.  I don't know how to turn that off.

-----Original Message-----
From: openafs-info-admin@openafs.org
[mailto:openafs-info-admin@openafs.org]On Behalf Of Neulinger, Nathan
Sent: Thursday, March 21, 2002 2:05 PM
To: openafs-info@openafs.org
Subject: RE: [OpenAFS] OpenAFS directory update is SLOW. Performance
tuning?

Same repository, much more remote AFS client:

infinity(2)>date; cvs update -d .>&/dev/null; date
Thu Mar 21 16:03:14 CST 2002
Thu Mar 21 16:03:24 CST 2002

10 seconds on that one for the same update that took Derrick 51.

I'd say it has alot to do with your network, the client machine, the
contents of your cache, etc.

How well does it run on your machine the second time you do the cvs
update?

-- Nathan

------------------------------------------------------------
Nathan Neulinger                       EMail:  nneul@umr.edu
University of Missouri - Rolla         Phone: (573) 341-4841
Computing Services                       Fax: (573) 341-4216

> -----Original Message-----
> From: Derrick J Brashear [mailto:shadow@dementia.org]
> Sent: Thursday, March 21, 2002 3:59 PM
> To: openafs-info@openafs.org
> Subject: Re: [OpenAFS] OpenAFS directory update is SLOW.
> Performance tuning?
>
>
> On Thu, 21 Mar 2002, Noel Burton-Krahn wrote:
>
> > It took 1.5 minutes to update on AFS, 7 seconds off local disk.  The
> > directory I did my "cvs update" in has 13022 files and 1220
> directories.  My
> > AFS client was configured with Cache Size: 200000, Chunk
> Size: 32kb, Status
> > Cache: 10000 entries.
>
> Remote CVS repository served off local disk of remote host
> (in this case,
> the openafs source itself, from cvs.openafs.org) to sandboxes
> on the same
> network:
>
> Local disk:
> date; cvs update -d .>&/dev/null; date
> Thu Mar 21 16:53:00 EST 2002
> Thu Mar 21 16:53:34 EST 2002
>
> AFS:
> date; cvs update -d .>&/dev/null; date
> Thu Mar 21 16:58:38 EST 2002
> Thu Mar 21 16:59:29 EST 2002
>
> You may say this is meaningless, and you'd be right. You did
> one trial. I
> did one trial. 34 seconds, versus 51 seconds.
>
> -D
>
>
>
> _______________________________________________
> OpenAFS-info mailing list
> OpenAFS-info@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-info
>
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