| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | "Jim C(dot) Nasby" <jim(at)nasby(dot)net> |
| Cc: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Load distributed checkpoint |
| Date: | 2006-12-28 18:03:50 |
| Message-ID: | 200612281803.kBSI3oF17297@momjian.us |
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| Lists: | pgsql-hackers pgsql-patches |
Jim C. Nasby wrote:
> On Thu, Dec 28, 2006 at 12:50:19PM -0500, Bruce Momjian wrote:
> > To summarize, if we could have fsync() only write the dirty buffers that
> > happened as part of the checkpoint, we could delay the write() for the
> > entire time between checkpoints, but we can't do that, so we have to
> > make it user-tunable.
>
> What about the mmap/msync(?)/munmap idea someone mentioned?
I see that as similar to using O_DIRECT during checkpoint, which had
poor performance.
--
Bruce Momjian bruce(at)momjian(dot)us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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