| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Scott Carey <scott(at)richrelevance(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, "Jignesh K(dot) Shah" <J(dot)K(dot)Shah(at)sun(dot)com>, Greg Smith <gsmith(at)gregsmith(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Proposal of tunable fix for scalability of 8.4 |
| Date: | 2009-03-20 21:58:13 |
| Message-ID: | 20090320215813.GR8313@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
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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