| From: | Peter Geoghegan <pg(at)heroku(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <bruce(at)momjian(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Claudio Freire <klaussfreire(at)gmail(dot)com>, Merlin Moncure <mmoncure(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: | 2014-05-07 18:13:14 |
| Message-ID: | CAM3SWZSu1NdV_yj-JitMUqZg8Bz-XjDjwJ_Ox_EX4E_3O3iGmg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, May 7, 2014 at 11:04 AM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
> Unfortunately nobody has the time/resources to do the kind of testing
> required for a new recommendation for shared_buffers.
I meant to suggest that the buffer manager could be improved to the
point that the old advice becomes obsolete. Right now, it's much
harder to analyze shared_buffers than it should be, presumably because
of the problems with the buffer manager. I think that if we could
formulate better *actionable* advice around what we have right now,
that would have already happened.
We ought to be realistic about the fact that the current
recommendations around sizing shared_buffers are nothing more than
folk wisdom. That's the best we have right now, but that seems quite
unsatisfactory to me.
--
Peter Geoghegan
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