Date: Tue, 27 Mar 2012 08:24:32 -0600 From: "Samuel J. Greear" <sjg@evilcode.net> To: Doug Barton <dougb@freebsd.org> Cc: "hackers@freebsd.org" <hackers@freebsd.org>, Ivan Voras <ivoras@freebsd.org> Subject: Re: PostgreSQL benchmarks (now with Linux numbers) Message-ID: <CANY-Wm9%2BZzavsJqZ=4_66gZxt7ehh%2BAZTbeAZxAz7Tkg=syabA@mail.gmail.com> In-Reply-To: <4F45AB76.5050201@FreeBSD.org> References: <b1732c99-eec2-4097-ad9c-f58979addf9f@email.android.com> <4F45AB76.5050201@FreeBSD.org>
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On Wed, Feb 22, 2012 at 7:59 PM, Doug Barton <dougb@freebsd.org> wrote: > On 02/22/2012 01:42, Ivan Voras wrote: > > The Dragonfly team has recently liberated their VM from the giant lock > and there are some interesting benchmarks comparing it to FreeBSD 9 and a > derivative of RedHat Enterprise Linux: > > > > http://leaf.dragonflybsd.org/mailarchive/kernel/2011-11/msg00008.html > > > > Other developments are described in their release notes: > http://www.dragonflybsd.org/release30/ > > The 4.5 times improvement by enabling kern.ipc.shm_use_phys is pretty > notable, what prevents us from enabling that by default? > > > Doug > > -- I just saw this, so I thought I would mention -- DragonFly was not doing a great job allocating pv entries rapidly, which is needed during PostgreSQL warm up -- This made shm_use_phys appear very effective. It only makes 1-2% difference now on DragonFly, and only 1-2% difference on FreeBSD. Sam
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