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From: Stephen Frost <sfrost@snowman.net>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Ivan Voras <ivoras@freebsd.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: [HACKERS] MIT benchmarks pgsql multicore (up to 48)performance
Date: Thu, 7 Oct 2010 14:06:20 -0400
Message-ID: <20101007180620.GY26232@tamriel.snowman.net> (raw)
In-Reply-To: <4CADBB410200002500036644@gw.wicourts.gov>
References: <AANLkTimW2UgVPGw6MRUBj9HabvwmsmkZasL3hKv-nUJ2@mail.gmail.com>
	<20101004175545.GA2690@csail.mit.edu>
	<4CAA21C7.1030701@agliodbs.com>
	<i8itbn$kre$1@dough.gmane.org>
	<AANLkTikXHJL+u9OdgiqCBQLB-bMcrkZeB1eEeyZqBPvA@mail.gmail.com>
	<20101007013012.GN26232@tamriel.snowman.net>
	<AANLkTi=AfTAwMv=WXdZeLzY0NNBZ1sJHDsDK+wmRMcVS@mail.gmail.com>
	<20101007020707.GP26232@tamriel.snowman.net>
	<AANLkTi=yhgL0KGmwx7SK20nBv4jqFufcscutvufkT+CN@mail.gmail.com>
	<4CADBB410200002500036644@gw.wicourts.gov>

* Kevin Grittner (Kevin.Grittner@wicourts.gov) wrote:
> Robert Haas <robertmhaas@gmail.com> wrote:
> > perhaps it would be possible by, say, increasing the number of
> > lock partitions by 8x.  It would be nice to segregate these issues
> > though, because using pread/pwrite is probably a lot less work
> > than rewriting our lock manager.
>  
> You mean easier than changing this 4 to a 7?:
>  
> #define LOG2_NUM_LOCK_PARTITIONS  4
>  
> Or am I missing something?

I'm pretty sure we were talking about the change described in the paper
of moving to a system which uses atomic changes instead of spinlocks for
certain locking situations..

If that's all the MIT folks did, they certainly made it sound like alot
more. :)

	Stephen

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  Subject: Re: [HACKERS] MIT benchmarks pgsql multicore (up to 48)performance
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