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Re: Moving more work outside WALInsertLock

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Moving more work outside WALInsertLock
Date: 2011-12-16 12:37:33
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Fri, Dec 16, 2011 at 12:07 PM, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:

> Anyway, I'm looking at ways to make the memcpy() of the payload happen
> without the lock, in parallel, and once you do that the record header CRC
> calculation can be done in parallel, too. That makes it irrelevant from a
> performance point of view whether the prev-link is included in the CRC or
> not.

Better plan. So we keep the prev link in the CRC.

I already proposed a design for that using page-level share locks any
reason not to go with that?

 Simon Riggs         
 PostgreSQL Development, 24x7 Support, Training & Services

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