From: "Artem S. Tashkinov" <t.artem@lycos.com>
To: arjan@infradead.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: Re: HT (Hyper Threading) aware process scheduling doesn't work as it should
Date: Sun, 30 Oct 2011 22:29:23 +0000 (GMT) [thread overview]
Message-ID: <1179048211.51348.1320013764432.JavaMail.mail@webmail17> (raw)
In-Reply-To: 20111030151256.27b2b20e@infradead.org
> On Oct 31, 2011, Arjan van de Ven wrote:
>
> On Sun, 30 Oct 2011 19:57:12 +0000 (GMT)
> "Artem S. Tashkinov" wrote:
>
> > Hello,
> >
> > It's known that if you want to reach maximum performance on HT
> > enabled Intel CPUs you should distribute the load evenly between
> > physical cores, and when you have loaded all of them you should then
> > load the remaining virtual cores.
>
> this is a bold statement, and patently false if you have to threads of
> one process that heavily share data between eachother...
> (but true for more independent workloads)
In my initial message I was talking about completely unrelated tasks/
processes which share no data/instructions/whatever else. You don't
need to trust my test case as you can carry out this test on your own.
I have asked quite a lot of people to do that and a lot of them see this
unfortunate pattern.
next prev parent reply other threads:[~2011-10-30 22:29 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-30 19:57 HT (Hyper Threading) aware process scheduling doesn't work as it should Artem S. Tashkinov
2011-10-30 21:26 ` Henrique de Moraes Holschuh
2011-10-30 21:51 ` Artem S. Tashkinov
2011-10-31 9:16 ` Henrique de Moraes Holschuh
2011-10-31 9:40 ` Artem S. Tashkinov
2011-10-31 11:58 ` Henrique de Moraes Holschuh
2011-11-01 4:14 ` Zhu Yanhai
2011-11-01 5:15 ` ffab ffa
2011-10-31 18:59 ` Chris Friesen
2011-11-01 6:01 ` Mike Galbraith
2011-10-30 22:12 ` Arjan van de Ven
2011-10-30 22:29 ` Artem S. Tashkinov [this message]
2011-10-31 3:19 ` Yong Zhang
2011-10-31 8:18 ` Artem S. Tashkinov
2011-10-31 10:06 ` Con Kolivas
2011-10-31 11:42 ` Mike Galbraith
2011-11-01 0:41 ` Con Kolivas
2011-11-01 0:58 ` Gene Heskett
2011-11-01 5:08 ` Mike Galbraith
2011-11-03 8:18 ` Ingo Molnar
2011-11-03 9:44 ` Artem S. Tashkinov
2011-11-03 10:29 ` Ingo Molnar
2011-11-03 12:42 ` Henrique de Moraes Holschuh
2011-11-03 13:06 ` Artem S. Tashkinov
2011-11-03 13:00 ` Mike Galbraith
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