On Sun, 2006-09-24 at 23:17 -0700, Ross Boylan wrote: > I've been using the UW-IMAP mailutil to copy messages from my regular > Unix mailboxes (for mutt) to IMAP. The messages are all going to a > single folder for a single user. > > My impression is that this is rather slow, about 20 minutes for 100MG > worth of messages. There is virtually no CPU use while this happens. number of messages is much more important than the size of them. we've recently relocated a bunch of mailboxes using imapsync, we got a speed of about 300 KiB/s for our users. users which had mostly large files with attachments went faster, traditional Unix users went slower, perhaps a factor of two either way. > The source traditional mailbox and destination IMAP server are on the > same machine, using the same hard disk (no, it's not a "real" server). that's not improving matters, of course. > Second, where should I look to diagnose or solve this problem? you could try oprofile to get systemwide performance numbers. > This is Debian GNU/Linux system with a SATA disk, using EVMS volume > management and Reiser FS. 2.6 kernel. Pentium 4 CPU. I'm using the > Debian packaging of Cyrus 2.2, and have generally not done a lot of > tuning/tweaking at any level (kernel, file system, Cyrus). I have no idea how to tweak ReiserFS (I don't want to lose my data again, so I stay away from it). with ext3 I'd suggest trying async mount, just to see the impact. if it helps, using a dedicated disk for the journal would be one way of improving the I/O wait. -- Kjetil T. ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
