Re: Move unused buffers to freelist
| От | Simon Riggs |
|---|---|
| Тема | Re: Move unused buffers to freelist |
| Дата | |
| Msg-id | CA+U5nMK+kGz8FM-oDepsYszd6xTiF9ghEJvsE1G41cg_HaA6DQ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Move unused buffers to freelist (Greg Smith <greg@2ndQuadrant.com>) |
| Ответы |
Re: Move unused buffers to freelist
|
| Список | pgsql-hackers |
On 3 July 2013 12:56, Amit Kapila <amit.kapila@huawei.com> wrote:
-- To optimize finding next victim buffer, I am planning to run the clock>My perspectives here would be
> * BufFreelistLock is a huge issue. Finding a next victim block needs to be
an O(1) operation, yet it is currently much worse than that. Measuring
> contention on that lock hides that problem, since having shared buffers
lock up for 100ms or more but only occasionally is a huge problem, even if
it
> doesn't occur frequently enough for the averaged contention to show as an
issue.
sweep in background. Apart from that do you have any idea to make it closer
to O(1)?
Yes, I already posted patches to attentuate the search time. Please check back last few CFs of 9.3
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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