| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | 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 05:20:00 |
| Message-ID: | CA+U5nMJbwH78uXKZXB9_FQD_CWYsr5-Vrkk8-FdD6tpU1VK=+g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 6 May 2014 23:47, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
> If you're going to make
> an argument in favor of different tuning advice, then do it based on
> something in which you actually believe, based on hard evidence.
The proposed default setting of 4x shared_buffers is unprincipled
*and* lacks hard evidence from you and everybody else.
You've used the phrase "conventional wisdom" to describe things which
you have spoken loudly about. I personally have not seen sufficient
evidence to rely on that as wisdom.
I note that my detailed comments as to why it is unsafe have been
ignored, again.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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