Re: Moving more work outside WALInsertLock

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От Simon Riggs
Тема Re: Moving more work outside WALInsertLock
Дата
Msg-id CA+U5nMJSDTtGu-BR+2bPFa4JQGypiGbgQDshkkhwxN0e_SjZHA@mail.gmail.com
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Ответ на Re: Moving more work outside WALInsertLock  (Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>)
Ответы Re: Moving more work outside WALInsertLock  (Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>)
Список pgsql-hackers
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?

--
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services


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