| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Mel Gorman <mgorman(at)suse(dot)de> |
| Cc: | James Bottomley <James(dot)Bottomley(at)HansenPartnership(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Kevin Grittner <kgrittn(at)ymail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Joshua Drake <jd(at)commandprompt(dot)com>, Claudio Freire <klaussfreire(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jim Nasby <jim(at)nasby(dot)net>, 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: | 2014-01-20 23:00:57 |
| Message-ID: | 20140120230057.GA21773@momjian.us |
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| Lists: | pgsql-hackers |
On Wed, Jan 15, 2014 at 11:49:09AM +0000, Mel Gorman wrote:
> It may be the case that mmap/madvise is still required to handle a double
> buffering problem but it's far from being a free lunch and it has costs
> that read/write does not have to deal with. Maybe some of these problems
> can be fixed or mitigated but it is a case where a test case demonstrates
> the problem even if that requires patching PostgreSQL.
We suspected trying to use mmap would have costs, but it is nice to hear
actual details about it.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
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