From: bzzz.tomas at gmail.com <bzzz.tomas@gmail.com>
To: lustre-devel@lists.lustre.org
Subject: [Lustre-devel] Queries regarding LDLM_ENQUEUE
Date: Wed, 20 Oct 2010 20:49:06 +0400 [thread overview]
Message-ID: <4CBF1D82.60508@gmail.com> (raw)
In-Reply-To: <4CBF1C42.1090109@psc.edu>
On 10/20/10 8:43 PM, Paul Nowoczynski wrote:
> It's for scalability reasons. When N clients traverse the namespace with
> the purpose of opening the same file the result is a storm of RPC
> requests which bear down on the metadata server. This type of activity
> becomes prohibitive especially when you start considering client counts
> > 10^4. An operation such as this is ripe for optimization because
> every client in the network is trying to build the same state. If you
> have a method for a single client to 'learn' the final state, i.e. the
> pathname -> fid translation, and broadcast it to its cohorts, it's a
> huge win because it eliminates an O(N) operation.
> paul
clear enough, but what is the bottleneck here: MDS to handle lots of
RPCs or network to pass RPCs ?
thanks, z
next prev parent reply other threads:[~2010-10-20 16:49 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 [this message]
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
2010-10-22 2:33 ` Vilobh Meshram
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