From: Manfred Spraul <manfred@colorfullife.com>
To: Rik van Riel <riel@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Davidlohr Bueso <davidlohr.bueso@hp.com>,
hhuang@redhat.com, Linus Torvalds <torvalds@linux-foundation.org>,
Mike Galbraith <efault@gmx.de>
Subject: Re: [PATCH 2/4] ipc/sem: seperate wait-for-zero and alter tasks into seperate queues
Date: Sat, 01 Jun 2013 13:52:02 +0200 [thread overview]
Message-ID: <51A9E062.3040208@colorfullife.com> (raw)
In-Reply-To: <51A9BCDA.9040006@colorfullife.com>
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Hi all,
On 06/01/2013 11:20 AM, Manfred Spraul wrote:
>
> - osim [i.e.: with reschedules] is much slower: around 21 us per
> schedule.
> Perhaps the scheduler didn't pair the threads optimally: intra-cpu
> reschedules
> take around 2 us on my i3, inter-cpu reschedules around 16 us.
>
I mixed up numbers.
osim reports around 1.6 us for the 64-thread system.
It is still odd that it is only factor 1.5 facter than my 4-thread i3,
but at least it is not slower.
Anyway: I have attached the table of all results that I have so far.
--
Manfred
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next prev parent reply other threads:[~2013-06-01 11:52 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-26 9:08 [PATCH 0/4] ipc/sem.c: Bug fixes, regression fixes, v3 Manfred Spraul
2013-05-26 9:08 ` [PATCH 1/4] ipc/sem.c: Fix missing wakeups in do_smart_update_queue() Manfred Spraul
2013-05-27 17:51 ` Rik van Riel
2013-05-27 19:53 ` Manfred Spraul
2013-05-26 9:08 ` [PATCH 2/4] ipc/sem: seperate wait-for-zero and alter tasks into seperate queues Manfred Spraul
2013-05-27 17:57 ` Rik van Riel
2013-06-01 9:20 ` Manfred Spraul
2013-06-01 10:03 ` Mike Galbraith
2013-06-01 10:05 ` Mike Galbraith
2013-06-01 11:04 ` Mike Galbraith
2013-06-01 11:52 ` Manfred Spraul [this message]
2013-05-26 9:08 ` [PATCH 3/4] ipc/sem.c: Always use only one queue for alter operations Manfred Spraul
2013-05-27 18:00 ` Rik van Riel
2013-05-26 9:08 ` [PATCH 4/4] ipc/sem.c: Rename try_atomic_semop() to perform_atomic_semop(), docu update Manfred Spraul
2013-05-27 17:59 ` Rik van Riel
2013-05-26 17:37 ` [PATCH 0/4] ipc/sem.c: Bug fixes, regression fixes, v3 Linus Torvalds
2013-05-26 20:50 ` Davidlohr Bueso
2013-05-26 22:59 ` Linus Torvalds
2013-05-27 15:57 ` Manfred Spraul
2013-05-28 20:37 ` Davidlohr Bueso
2013-05-27 2:04 ` Greg KH
2013-05-27 17:50 ` Rik van Riel
2013-05-27 19:57 ` Greg KH
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