linux-kernel - Re: [sqlite] light weight write barriers

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Date:	Mon, 5 Nov 2012 21:03:48 +0100
From:	Pavel Machek <pavel@....cz>
To:	Theodore Ts'o <tytso@....edu>, david@...g.hm,
	Nico Williams <nico@...ptonector.com>,
	General Discussion of SQLite Database 
	<sqlite-users@...ite.org>, ????????? Yang Su Li <suli@...wisc.edu>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>, drh@...ci.com
Subject: Re: [sqlite] light weight write barriers

On Thu 2012-10-25 14:29:48, Theodore Ts'o wrote:
> On Thu, Oct 25, 2012 at 11:03:13AM -0700, david@...g.hm wrote:
> > I agree, this is why I'm trying to figure out the recommended way to
> > do this without needing to do full commits.
> > 
> > Since in most cases it's acceptable to loose the last few chunks
> > written, if we had some way of specifying ordering, without having
> > to specify "write this NOW", the solution would be pretty obvious.
> 
> Well, using data journalling with ext3/4 may do what you want.  If you
> don't do any fsync, the changes will get written every 5 seconds when
> the automatic journal sync happens (and sub-4k writes will also get

Hmm. But that would need setting journalling mode per-file, no?

Like, make it journal data for all the databases, but keep normal mode
for rest of system...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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