Jack Stewart
2008-Aug-17 19:33 UTC
[Dovecot] IMAP maildir performance difference between dovecot-uidlist versions?
Hi, Is there an IMAP performance difference using Maildir between using version 3 and version 1 of the dovecot-uidlist (either dovecot 1.0.7 or 1.1.2)? It isn't entirely clear to me there is any difference as the filename may contain the size/vsize information. The servers will eventually be running 1.1.2 with the maildir_copy_preserve_filename turned on. I'm doing a batch migration from courier to dovecot 1.0.7 and eventually dovecot 1.1.2. These servers are, and will continue to be, IMAP only (i.e. dedicated control/dovecot-uidlist files). The migration script is run once - no build on the fly. It does a readdir() to get the full filenames and make sure that list entries are only for existing files. As a result, there is almost complete freedom in the output format for the dovecot-uidlist. Many thanks in advance! ---Jack P.S. For better or worse, it does seem that once you are stuck with whatever initial version you choose. -- Jack Stewart IMSS, California Institute of Technology, M/C 1-10, 1200 E. California Blvd, Pasadena, CA 91125 jstewart at caltech.edu / 626-309-4690 http://www.imss.caltech.edu
Timo Sirainen
2008-Aug-17 20:24 UTC
[Dovecot] IMAP maildir performance difference between dovecot-uidlist versions?
On Sun, 2008-08-17 at 12:33 -0700, Jack Stewart wrote:> Hi, > > Is there an IMAP performance difference using Maildir between using > version 3 and version 1 of the dovecot-uidlist (either dovecot 1.0.7 or > 1.1.2)?There are two differences in version 3: 1. It's extensible, so it allows some extra metadata fields. If the file name doesn't already contain size/vsize then it might write the sizes to uidlist to optimize some usage patterns (pop3 mainly). 2. New data may be appended to dovecot-uidlist instead of the entire file being recreated all the time. This will surely make the performance better. In any case Dovecot v1.0 will always write only v1 files while Dovecot v1.1 will always write only v3 files, so you won't be able to choose between them. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 197 bytes Desc: This is a digitally signed message part URL: <http://dovecot.org/pipermail/dovecot/attachments/20080817/6714ebda/attachment-0002.bin>
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