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From: Alvaro Herrera <alvherre@commandprompt.com>
To: Scott Carey <scott@richrelevance.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Jignesh K. Shah <J.K.Shah@sun.com>
Cc: Greg Smith <gsmith@gregsmith.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Proposal of tunable fix for scalability of 8.4
Date: Fri, 20 Mar 2009 17:58:13 -0400
Message-ID: <20090320215813.GR8313@alvh.no-ip.org> (raw)
In-Reply-To: <20090320154601.GC8313@alvh.no-ip.org>
References: <603c8f070903191349p5e8fb00as2816581d584fcefd@mail.gmail.com>
	<BDFBB77C9E07BE4A984DAAE981D19F961AEE7AFBB5@EXVMBX018-1.exch018.msoutlookonline.net>
	<20090320154601.GC8313@alvh.no-ip.org>

Alvaro Herrera escribió:

> Simon's explanation, however, is at odds with the code.
> 
> http://git.postgresql.org/?p=postgresql.git;a=blob;f=src/backend/storage/lmgr/lwlock.c
> 
> There is "queue jumping" in the regular (heavyweight) lock manager, but
> that's a pretty different body of code.

I'll just embarrass myself by pointing out that Neil Conway described
this back in 2004:
http://archives.postgresql.org//pgsql-hackers/2004-11/msg00905.php

So Simon's correct.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.



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