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Re: Multithread Query Planner

From: Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr>
To: Christopher Browne <cbbrowne(at)gmail(dot)com>
Cc: Frederico <zepfred(at)gmail(dot)com>, "pgsql-hackers\(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Multithread Query Planner
Date: 2012-01-13 22:47:51
Message-ID: m2ty3zrzhk.fsf@2ndQuadrant.fr (view raw or flat)
Thread:
Lists: pgsql-hackers
Christopher Browne <cbbrowne(at)gmail(dot)com> writes:
> Yes, don't try to use threads.
>
> <http://wiki.postgresql.org/wiki/Developer_FAQ#Why_don.27t_you_use_threads.2C_raw_devices.2C_async-I.2FO.2C_.3Cinsert_your_favorite_wizz-bang_feature_here.3E.3F>
>
> ... threads are not currently used instead of multiple processes for
> backends because:

I would only add that the backend code is really written in a process
based perspective, with a giant number of private variables that are in
fact global variables.

Trying to “clean” that out in order to get to threads… wow.

Regards,
-- 
Dimitri Fontaine
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support

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