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From: Alex Zhuravlev <Alex.Zhuravlev@Sun.COM>
To: lustre-devel@lists.lustre.org
Subject: [Lustre-devel] statahead feature
Date: Fri, 25 Jul 2008 23:50:13 +0400	[thread overview]
Message-ID: <488A2E75.80901@sun.com> (raw)
In-Reply-To: <20080725194109.GV5346@webber.adilger.int>

Andreas Dilger wrote:
> IMHO it would also be useful to start the OST glimpse in the callback as
> soon as the MDT "glimpse" is returned.  Without a change like this we
> are limited to <= 2x speedup for statahead until size-on-MDS is done.
> That is because we are hiding the MDT RPC latency, but still have to wait
> for the parallel OST RPC latency, so:
> 
> speedup = (old time / new time) = (MDT RPC + max(OST RPC)) / max(OST RPC)

definitely

thanks, Alex

  reply	other threads:[~2008-07-25 19:50 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-24 10:19 [Lustre-devel] statahead feature Alex Zhuravlev
2008-07-24 11:35 ` Alex Lyashkov
2008-07-24 16:27 ` Peter Braam
2008-07-24 18:56   ` Alex Zhuravlev
2008-07-25  4:34 ` Yong Fan
2008-07-25  4:41   ` Alex Zhuravlev
2008-07-25  5:04     ` Ragnar Kjørstad
2008-07-25  5:17       ` Alex Zhuravlev
2008-07-28 22:02       ` Andreas Dilger
2008-07-25  9:37     ` Alex Lyashkov
2008-07-25 12:29       ` Alex Zhuravlev
2008-07-25 19:41       ` Andreas Dilger
2008-07-25 19:50         ` Alex Zhuravlev [this message]
2008-07-25  4:44   ` Alex Zhuravlev

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