| 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: | CA+U5nMJSDTtGu-BR+2bPFa4JQGypiGbgQDshkkhwxN0e_SjZHA@mail.gmail.com |
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| 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 http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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