Slow IMAP startup

Slow IMAP startup

[Nevin Kapur]

On my IMAP server (running U. Washington's IMAP 2001a), I have about
250 groups that are stored under the hierarchy mail/.  Consequently I
have as one of the entries in nnimap-list-pattern mail/*.  (I cannot
use mail/% as the subdirectories are created on the fly.)

I've noticed that Gnus takes an inordinately long time to start up.
In the minibuffer I see the message "Listing subscribed groups on..."
and I have to wait for about 3 to 4 minutes.

Is this behavior expected?  (Other IMAP clients are noticeably faster
on startup.)

-N

Re: Slow IMAP startup

[Kai Großjohann]

Nevin Kapur <kapur@mts.jhu.edu> writes:

> I've noticed that Gnus takes an inordinately long time to start up.
> In the minibuffer I see the message "Listing subscribed groups on..."
> and I have to wait for about 3 to 4 minutes.

See variable nnimap-request-list-method.  Does it help?
-- 
~/.signature

[PATCH] Re: Slow IMAP startup

[Nevin Kapur]

kai.grossjohann@gmx.net (Kai Großjohann) writes:

> Nevin Kapur <kapur@mts.jhu.edu> writes:
>
>> I've noticed that Gnus takes an inordinately long time to start up.
>> In the minibuffer I see the message "Listing subscribed groups on..."
>> and I have to wait for about 3 to 4 minutes.
>
> See variable nnimap-request-list-method.  Does it help?

Not in any meaningful way.  (But read on for the full story.)

I set about trying to identify the bottleneck.  Using elp and edebug,
I think I identified a bug in nnimap-request-newgroups.  While looping
over nnimap-list-pattern it ignores the pattern, resulting in each of
your subscribed mailboxes being accessed once for each pattern.  The
following patch fixes this and has cut the startup time for me by
about a fourth.  Would someone review it and commit it, please?

2003-07-12  Nevin Kapur  <kapur@mts.jhu.edu>

	* nnimap.el (nnimap-request-newgroups): Use the pattern in
	nnimap-list-pattern instead of "*".


Index: lisp/nnimap.el
===================================================================
RCS file: /usr/local/cvsroot/gnus/lisp/nnimap.el,v
retrieving revision 6.68
diff -u -r6.68 nnimap.el
--- lisp/nnimap.el	17 Jun 2003 22:32:02 -0000	6.68
+++ lisp/nnimap.el	12 Jul 2003 22:04:14 -0000
@@ -1326,7 +1326,7 @@
       (nnimap-before-find-minmax-bugworkaround)
       (dolist (pattern (nnimap-pattern-to-list-arguments
 			nnimap-list-pattern))
-	(dolist (mbx (imap-mailbox-lsub "*" (car pattern) nil
+	(dolist (mbx (imap-mailbox-lsub (cdr pattern) (car pattern) nil
 					nnimap-server-buffer))
 	  (or (catch 'found
 		(dolist (mailbox (imap-mailbox-get 'list-flags mbx
        
-Nevin

Re: [PATCH] Re: Slow IMAP startup

[Simon Josefsson]

Nevin Kapur <kapur@mts.jhu.edu> writes:

> I set about trying to identify the bottleneck.  Using elp and edebug,
> I think I identified a bug in nnimap-request-newgroups.  While looping
> over nnimap-list-pattern it ignores the pattern, resulting in each of
> your subscribed mailboxes being accessed once for each pattern.  The
> following patch fixes this and has cut the startup time for me by
> about a fourth.  Would someone review it and commit it, please?

Added, thanks.