From: Ricardo M. Correia <Ricardo.M.Correia@Sun.COM>
To: lustre-devel@lists.lustre.org
Subject: [Lustre-devel] SMP Scalability, MDS, reducing cpu pingpong
Date: Wed, 29 Jul 2009 19:55:31 +0100 [thread overview]
Message-ID: <1248893731.4563.13.camel@localhost> (raw)
In-Reply-To: <31A2D6F1-C723-4EB5-8515-D155FE923C9A@Sun.COM>
On Qua, 2009-07-29 at 12:01 -0400, Oleg Drokin wrote:
> Yes. If clients are not contending, we have same benefits, but
> this never happens in the real world.
> Creates in a same dir is a contention point on the dir and there is
> no point in scheduling all clients on different cpus and let them
> serialize, where we can free those cpus for some other set of clients
> doing something else.
Will this still be true with the DMU?
I don't know which locks are involved at the Lustre level, but the DMU
itself does leaf-level locking of ZAP structures (used for directories).
Cheers,
Ricardo
next prev parent reply other threads:[~2009-07-29 18:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <7580C3C1-7634-47C8-827B-C93157C1301A@Sun.COM>
2009-07-29 15:37 ` [Lustre-devel] SMP Scalability, MDS, reducing cpu pingpong Eric Barton
2009-07-29 16:01 ` Oleg Drokin
2009-07-29 18:55 ` Ricardo M. Correia [this message]
2009-07-29 19:05 ` Oleg Drokin
2009-07-29 19:22 ` Nicolas Williams
2009-07-30 1:40 ` Andreas Dilger
2009-07-30 9:25 ` Liang Zhen
2009-07-30 13:35 ` Oleg Drokin
2009-07-30 13:53 ` Liang Zhen
2009-07-30 23:19 ` Andreas Dilger
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