| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Atri Sharma <atri(dot)jiit(at)gmail(dot)com> |
| Cc: | Peter Geoghegan <pg(at)heroku(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Ants Aasma <ants(at)cybertec(dot)at>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Clock sweep not caching enough B-Tree leaf pages? |
| Date: | 2014-04-18 22:07:36 |
| Message-ID: | 20140418220736.GC16269@momjian.us |
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| Lists: | pgsql-hackers |
On Sat, Apr 19, 2014 at 01:21:29AM +0530, Atri Sharma wrote:
> I feel that if there is no memory pressure, frankly it doesnt matter much about
> what gets out and what not. The case I am specifically targeting is when the
> clocksweep gets to move about a lot i.e. high memory pressure workloads. Of
> course, I may be totally wrong here.
>
> One thing that I discussed with Merlin offline and am now concerned about is
> how will the actual eviction work. We cannot traverse the entire list and then
> find all the buffers with refcount 0 and then do another traversal to find the
> oldest one.
I thought if there was memory pressure the clock sweep would run and we
wouldn't have everything at the max counter access value.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
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