From: Nicolas Williams <Nicolas.Williams@oracle.com>
To: lustre-devel@lists.lustre.org
Subject: [Lustre-devel] Queries regarding LDLM_ENQUEUE
Date: Wed, 20 Oct 2010 12:01:24 -0500 [thread overview]
Message-ID: <20101020170124.GT1635@oracle.com> (raw)
In-Reply-To: <4CBF1D00.9080402@psc.edu>
On Wed, Oct 20, 2010 at 12:46:56PM -0400, Paul Nowoczynski wrote:
>
> > The name_to_handle() only needs to be called on a single node, and
> > open_by_handle() is called on the other nodes. I agree that this
> > doesn't avoid the full O(n) RPCs for the open itself but at least it
> > does avoid the full path traversal from every client and on the
> > MDS (replacing it with an MPI broadcast of the handle).
> Andreas,
> excuse my ignorance, but why does open_by_handle() need to issue an
> RPC? If it's to obtain the layout, couldn't the layout be encoded into
> the 'handle'?
If you don't mind having a huge handle, then yes, we could skip
additional RPCs.
A handle would have to consist of a {MGS address, FID, layout, access
type, capability}, or so.
next prev parent reply other threads:[~2010-10-20 17:01 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-18 23:33 [Lustre-devel] Queries regarding LDLM_ENQUEUE Vilobh Meshram
2010-10-19 15:46 ` Fan Yong
2010-10-19 20:28 ` Vilobh Meshram
2010-10-19 22:53 ` Andreas Dilger
2010-10-20 2:04 ` Vilobh Meshram
2010-10-20 7:55 ` Andreas Dilger
2010-10-20 8:11 ` bzzz.tomas at gmail.com
2010-10-20 8:24 ` Andreas Dilger
2010-10-20 8:30 ` bzzz.tomas at gmail.com
2010-10-20 8:38 ` Nikita Danilov
2010-10-20 14:45 ` Nicolas Williams
2010-10-20 13:30 ` Eric Barton
2010-10-20 13:40 ` bzzz.tomas at gmail.com
2010-10-20 14:51 ` Paul Nowoczynski
2010-10-20 14:55 ` Nicolas Williams
2010-10-20 15:16 ` Paul Nowoczynski
2010-10-20 16:07 ` Andreas Dilger
2010-10-20 15:22 ` bzzz.tomas at gmail.com
2010-10-20 16:43 ` Paul Nowoczynski
2010-10-20 16:49 ` bzzz.tomas at gmail.com
2010-10-20 17:11 ` Paul Nowoczynski
2010-10-20 17:18 ` bzzz.tomas at gmail.com
2010-10-20 17:25 ` Paul Nowoczynski
2010-10-20 17:27 ` Andreas Dilger
2010-10-20 17:29 ` Nicolas Williams
2010-10-20 17:40 ` bzzz.tomas at gmail.com
2010-10-20 18:01 ` Andreas Dilger
2010-10-20 18:09 ` bzzz.tomas at gmail.com
2010-10-20 16:35 ` Andreas Dilger
2010-10-20 16:46 ` Paul Nowoczynski
2010-10-20 17:00 ` Andreas Dilger
2010-10-20 17:13 ` Nicolas Williams
2010-10-20 17:30 ` Andreas Dilger
2010-10-20 17:01 ` Nicolas Williams [this message]
2010-10-22 2:33 ` Vilobh Meshram
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