linux-kernel - Re: ipc,sem: sysv semaphore scalability

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Date:	Wed, 20 Mar 2013 13:57:02 -0700
From:	Davidlohr Bueso <davidlohr.bueso@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rik van Riel <riel@...riel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hhuang@...hat.com,
	"Low, Jason" <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: Re: ipc,sem: sysv semaphore scalability

On Wed, 2013-03-20 at 13:49 -0700, Linus Torvalds wrote:
> On Wed, Mar 20, 2013 at 12:55 PM, Rik van Riel <riel@...riel.com> wrote:
> >
> > This series makes the sysv semaphore code more scalable,
> > by reducing the time the semaphore lock is held, and making
> > the locking more scalable for semaphore arrays with multiple
> > semaphores.
> 
> The series looks sane to me, and I like how each individual step is
> pretty small and makes sense.
> 
> It *would* be lovely to see this run with the actual Swingbench
> numbers. The microbenchmark always looked much nicer. Do the
> additional multi-semaphore scalability patches on top of Davidlohr's
> patches help with the swingbench issue, or are we still totally
> swamped by the ipc lock there?

Yes, I'm testing this patchset with my swingbench workloads. I should
have some numbers by today or tomorrow.

> 
> Maybe there were already numbers for that, but the last swingbench
> numbers I can actually recall was from before the finer-grained
> locking..

Right, I couldn't get Oracle to run on the with the previous patches,
hopefully the bug(s) are now addressed.

Thanks,
Davidlohr

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