Horton

Re: Moving more work outside WALInsertLock

Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>

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From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: Simon Riggs <simon@2ndQuadrant.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Jeff Janes <jeff.janes@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2011-12-16T12:50:24Z
Lists: pgsql-hackers 
On 16.12.2011 14:37, Simon Riggs wrote:
> On Fri, Dec 16, 2011 at 12:07 PM, Heikki Linnakangas
> <heikki.linnakangas@enterprisedb.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?

Sorry, I must've missed that. Got a link?

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com