Re: Page replacement algorithm in buffer cache
От | Andres Freund |
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Тема | Re: Page replacement algorithm in buffer cache |
Дата | |
Msg-id | 20130402163609.GG2415@alap2.anarazel.de обсуждение исходный текст |
Ответ на | Re: Page replacement algorithm in buffer cache (Tom Lane <tgl@sss.pgh.pa.us>) |
Ответы |
Re: Page replacement algorithm in buffer cache
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Список | pgsql-hackers |
On 2013-04-02 12:22:03 -0400, Tom Lane wrote: > Robert Haas <robertmhaas@gmail.com> writes: > > But, having said that, I still think the best idea is what Andres > > proposed, which pretty much matches my own thoughts: the bgwriter > > needs to populate the free list, so that buffer allocations don't have > > to wait for linear scans of the buffer array. That's just plain too > > slow. > > I agree in general, though I'm not sure the bgwriter process can > reasonably handle this need along with what it's already supposed to be > doing. We may need another background process that is just responsible > for keeping the freelist populated. What else is the bgwriter actually doing otherwise? Sure, it doesn't put the pages on the freelist, but otherwise its trying to do the above isn't it? Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services
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