From: "Martin J. Bligh" <mbligh@aracnet.com>
To: William Lee Irwin III <wli@holomorphy.com>,
Erich Focht <efocht@ess.nec.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
LSE <lse-tech@lists.sourceforge.net>, Ingo Molnar <mingo@elte.hu>,
Michael Hohnbaum <hohnbaum@us.ibm.com>
Subject: Re: [Lse-tech] [PATCH 1/2] node affine NUMA scheduler
Date: Sun, 22 Sep 2002 15:51:00 -0700 [thread overview]
Message-ID: <98549676.1032709859@[10.10.2.3]> (raw)
In-Reply-To: <20020922223630.GG25605@holomorphy.com>
> On Sun, Sep 22, 2002 at 11:59:16PM +0200, Erich Focht wrote:
>> A bit more difficult is tuning the scheduler parameters which can
>> be done pretty simply by changing the __node_distance matrix. A first
>> attempt could be: 10 on the diagonal, 100 off-diagonal. This leads to
>> larger delays when stealing from a remote node.
>
> This is not entirely reflective of our architecture. Node-to-node
> latencies vary as well. Some notion of whether communication must cross
> a lash at the very least should be present.
Ummm ... I think it's just flat on or off node, presumably Erich
has "on the diagonal" meaning they're on the same node, and
"off-diagonal" meaning they're not. In which case, what he suggested
seems fine ... it's really about 20:1 ratio so I might use 10
and 200, but other than that, it seems correct to me.
M.
next prev parent reply other threads:[~2002-09-22 22:47 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-21 9:59 [PATCH 1/2] node affine NUMA scheduler Erich Focht
2002-09-21 10:02 ` [PATCH 2/2] " Erich Focht
2002-09-21 15:55 ` [Lse-tech] [PATCH 1/2] " Martin J. Bligh
2002-09-21 16:32 ` Martin J. Bligh
2002-09-21 16:46 ` Martin J. Bligh
2002-09-21 17:11 ` Martin J. Bligh
2002-09-21 17:32 ` Erich Focht
2002-09-21 17:38 ` William Lee Irwin III
2002-09-21 23:18 ` William Lee Irwin III
2002-09-22 8:09 ` William Lee Irwin III
2002-09-22 8:30 ` Erich Focht
2002-09-22 17:11 ` Martin J. Bligh
2002-09-22 19:20 ` Martin J. Bligh
2002-09-22 21:59 ` Erich Focht
2002-09-22 22:36 ` William Lee Irwin III
2002-09-22 22:51 ` Martin J. Bligh [this message]
2002-09-23 18:19 ` node affine NUMA scheduler: simple benchmark Erich Focht
2002-09-22 10:35 ` [Lse-tech] [PATCH 1/2] node affine NUMA scheduler Erich Focht
2002-09-22 10:45 ` Erich Focht
2002-09-22 14:57 ` Martin J. Bligh
2002-09-23 18:38 ` Erich Focht
2002-09-23 18:47 ` Martin J. Bligh
2002-09-24 21:04 ` Erich Focht
2002-09-24 21:17 ` Martin J. Bligh
2002-09-22 15:52 ` Martin J. Bligh
2002-09-22 19:24 ` Martin J. Bligh
2002-09-24 23:59 ` Matthew Dobson
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