From: nicolas.pouillard@gmail.com (Nicolas Pouillard)
Subject: [sup-talk] sup-sync and xapian memory usage
Date: Tue, 08 Sep 2009 17:14:22 +0200 [thread overview]
Message-ID: <1252422827-sup-805@peray> (raw)
In-Reply-To: <1252419716-sup-3031@roughage.com.au>
Excerpts from Richard Heycock's message of Tue Sep 08 16:27:10 +0200 2009:
> Excerpts from William Morgan's message of Tue Sep 08 23:39:12 +1000 2009:
> > Reformatted excerpts from Rich Lane's message of 2009-09-07:
> > > Excerpts from Ben Walton's message of Mon Sep 07 15:11:58 -0400 2009:
> > > > Excerpts from Rich Lane's message of Mon Sep 07 14:33:06 -0400 2009:
> > > > > Xapian keeps writes buffered in memory. Try setting the
> > > > > environment variable XAPIAN_FLUSH_THRESHOLD to a smaller value
> > > > > (the default is 10000 documents) and see if that helps.
> > > >
> > > > Does this explain the lag at shutdown? Xapian is flushing writes to
> > > > disk?
> > >
> > > Yep.
> >
> > Good to know. Is there a way to force a flush in Xapian? Just curious.
> > The delay is a little scary sometimes. Maybe it just needs an
> > appropriate message somewhere.
>
> Xapian, by default, flushes every 10 000 documents which in email terms
> is a pretty long time! You can force a flush but it does increase your
> IO significantly. Having said that emails are fairly small so flushing
> every 10 or 20 emails might not be too bad.
>
> Maybe it could be dynamic, if there is a high volume of incoming emails
> flushing could be done after 50 or 100 emails or a timer based flush
> might be easier.
Should the '$' command, force a write of the Xapian database?
--
Nicolas Pouillard
http://nicolaspouillard.fr
next prev parent reply other threads:[~2009-09-08 15:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-07 17:04 Andrew Pimlott
2009-09-07 18:14 ` Ben Walton
2009-09-07 18:33 ` Rich Lane
2009-09-07 19:11 ` Ben Walton
2009-09-07 19:15 ` Rich Lane
2009-09-08 13:39 ` William Morgan
2009-09-08 13:58 ` Ben Walton
2009-09-08 14:27 ` Richard Heycock
2009-09-08 15:14 ` Nicolas Pouillard [this message]
2009-09-09 6:18 ` Rich Lane
2009-09-07 19:26 ` Andrew Pimlott
2009-09-08 13:15 ` William Morgan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1252422827-sup-805@peray \
--to=nicolas.pouillard@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox