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From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Andrew Theurer <habanero@us.ibm.com>,
	Andrew Morton <akpm@digeo.com>,
	William Lee Irwin III <wli@holomorphy.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.5.38-mm2 dbench $N times
Date: Wed, 25 Sep 2002 13:57:22 -0700	[thread overview]
Message-ID: <253480000.1032987442@flay> (raw)
In-Reply-To: <200209251351.58355.habanero@us.ibm.com>

> Pretty sure each dbench child does it's own write/read to only it's own data.  
> There is no sharing that I am aware of between the processes.  

Right, but if the processes migrate easily, there's still no CPU locality.
Bill, do you want to try binding 1/32 of the processes to each CPU, and see if
that makes your throughput increase?

> How about running in tmpfs to avoid any disk IO at all?  

As far as I understand it, that won't help - we're operating out of pagecache anyway 
at this level, I think.
 
> Also, what's the policy for home node assignment on fork?  Are all of these 
> children getting the same home node assingnment??

Policy is random - the scheduler lacks any NUMA comprehension at the moment.
The numa sched mods would probably help a lot too.

M.


  reply	other threads:[~2002-09-25 20:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24 13:20 William Lee Irwin III
2002-09-24 17:47 ` Andrew Morton
2002-09-25  0:18   ` William Lee Irwin III
2002-09-25  0:25     ` William Lee Irwin III
2002-09-25  0:31     ` Andrew Morton
2002-09-25  0:39       ` William Lee Irwin III
2002-09-25  0:46         ` Andrew Morton
2002-09-25  1:08       ` Dave Hansen
2002-09-25  1:17         ` William Lee Irwin III
2002-09-25  6:03       ` Martin J. Bligh
2002-09-25 18:51         ` Andrew Theurer
2002-09-25 20:57           ` Martin J. Bligh [this message]
2002-09-25 21:05             ` Andrew Theurer
2002-09-25 23:57           ` William Lee Irwin III

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