| From: | Jonathan Corbet <corbet(at)lwn(dot)net> |
|---|---|
| To: | Dave Chinner <david(at)fromorbit(dot)com> |
| Cc: | Kevin Grittner <kgrittn(at)ymail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jan Kara <jack(at)suse(dot)cz>, Hannu Krosing <hannu(at)2ndquadrant(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Trond Myklebust <trondmy(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Joshua Drake <jd(at)commandprompt(dot)com>, James Bottomley <James(dot)Bottomley(at)hansenpartnership(dot)com>, Mel Gorman <mgorman(at)suse(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "lsf-pc(at)lists(dot)linux-foundation(dot)org" <lsf-pc(at)lists(dot)linux-foundation(dot)org>, Magnus Hagander <magnus(at)hagander(dot)net> |
| Subject: | Re: [Lsf-pc] Linux kernel impact on PostgreSQL performance |
| Date: | 2014-01-15 00:38:10 |
| Message-ID: | 20140114173810.20de3507@lwn.net |
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| Lists: | pgsql-hackers |
On Wed, 15 Jan 2014 09:23:52 +1100
Dave Chinner <david(at)fromorbit(dot)com> wrote:
> It appears to me that we are seeing large memory machines much more
> commonly in data centers - a couple of years ago 256GB RAM was only
> seen in supercomputers. Hence machines of this size are moving from
> "tweaking settings for supercomputers is OK" class to "tweaking
> settings for enterprise servers is not OK"....
>
> Perhaps what we need to do is deprecate dirty_ratio and
> dirty_background_ratio as the default values as move to the byte
> based values as the defaults and cap them appropriately. e.g.
> 10/20% of RAM for small machines down to a couple of GB for large
> machines....
I had thought that was already in the works...it hits people on far
smaller systems than those described here.
http://lwn.net/Articles/572911/
I wonder if anybody ever finished this work out for 3.14?
jon
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