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From: Manfred Spraul <manfred@colorfullife.com>
To: Chris Mason <chris.mason@oracle.com>,
	Nick Piggin <npiggin@suse.de>,
	zach.brown@oracle.com, jens.axboe@oracle.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] ipc semaphores: reduce ipc_lock contention in semtimedop
Date: Thu, 15 Apr 2010 18:33:13 +0200	[thread overview]
Message-ID: <4BC73FC9.1090007@colorfullife.com> (raw)
In-Reply-To: <20100414195003.GE3228@think>

On 04/14/2010 09:50 PM, Chris Mason wrote:
> On a big system I saw about 4000 semaphores total.  The database will
> just allocate as many as it can into a single array and keep creating
> arrays until it has all it needs.
>
>    
What happens if SEMMSL is reduced (first entry in /proc/sys/kernel/sem)?

--
     Manfred

  reply	other threads:[~2010-04-15 16:33 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-12 18:49 [PATCH RFC] Optimize semtimedop Chris Mason
2010-04-12 18:49 ` [PATCH 1/2] ipc semaphores: reduce ipc_lock contention in semtimedop Chris Mason
2010-04-13 17:15   ` Manfred Spraul
2010-04-13 17:39     ` Chris Mason
2010-04-13 18:09       ` Nick Piggin
2010-04-13 18:19         ` Chris Mason
2010-04-13 18:57           ` Nick Piggin
2010-04-13 19:01             ` Chris Mason
2010-04-13 19:25               ` Nick Piggin
2010-04-13 19:38                 ` Chris Mason
2010-04-13 20:05                   ` Nick Piggin
2010-05-16 16:57             ` Manfred Spraul
2010-05-16 22:40               ` Chris Mason
2010-05-17  7:20               ` Nick Piggin
2010-04-14 16:16           ` Manfred Spraul
2010-04-14 17:33             ` Chris Mason
2010-04-14 19:11               ` Manfred Spraul
2010-04-14 19:50                 ` Chris Mason
2010-04-15 16:33                   ` Manfred Spraul [this message]
2010-04-15 16:34                     ` Chris Mason
2010-04-13 18:24         ` Zach Brown
2010-04-16 11:26   ` Manfred Spraul
2010-04-16 11:45     ` Chris Mason
2010-04-12 18:49 ` [PATCH 2/2] ipc semaphores: order wakeups based on waiter CPU Chris Mason
2010-04-17 10:24   ` Manfred Spraul

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