| From: | Peter Geoghegan <pg(at)heroku(dot)com> |
|---|---|
| To: | Noah Misch <noah(at)leadboat(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andres Freund <andres(at)2ndquadrant(dot)com>, Greg Stark <stark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Decrease MAX_BACKENDS to 2^16 |
| Date: | 2014-04-26 21:16:46 |
| Message-ID: | CAM3SWZSvdpqUgzX+7gHjGi0_fhKN9Q-6F-phBZZpc2eyPMo=Mw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sat, Apr 26, 2014 at 1:58 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> The 2Q paper also suggests a correlated reference period.
I withdraw this. 2Q in fact does not have such a parameter, while
LRU-K does. But the other major system I mentioned very explicitly has
a configurable delay that serves this exact purpose. This "prevents a
burst of pins on a buffer counting as many touches". The point is that
this approach is quite feasible, and may even be the best way of
addressing the general problem of correlated references.
--
Peter Geoghegan
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