| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: proposal: Set effective_cache_size to greater of .conf value, shared_buffers |
| Date: | 2013-09-11 13:18:30 |
| Message-ID: | 20130911131830.GQ16378@momjian.us |
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| Thread: | |
| Lists: | pgsql-hackers |
On Tue, Sep 10, 2013 at 03:08:24PM -0700, Josh Berkus wrote:
> Merlin,
>
> > I vote 4x on the basis that for this setting (unlike almost all the
> > other memory settings) the ramifications for setting it too high
> > generally aren't too bad. Also, the o/s and temporary memory usage as
> > a share of total physical memory has been declining over time
>
> If we're doing that, then we should change our general advice on this
> setting as well.
Uh, what general advice? I don't see 4x mentioned anywhere.
> Another argument in favor: this is a default setting, and by default,
> shared_buffers won't be 25% of RAM.
So, are you saying you like 4x now?
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
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