nnmaildir: Performance in nnmaildir-request-update-info

[Christian Plate <cplate@web.de>]

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Hello,

I found a performance problem in nnmaildir and think i solved it.

Problem: I have various maildirs with >9000 mails. If i read a new
mail, quit the group and then hit "gnus-group-get-new-news" in the
Groups-buffer, it takes 30s till i get an updated Groups-buffer.

Profiling shows that nnmaildir-request-update-info is to
blame. gnus-add-to-range is called for every single article which is
found in the markdirs.

I changed the implementation to collect all article numbers in a list
and then call gnus-add-to-range only once with that list of article
numbers.

This causes a huge performance gain on my machine. For my big
mailboxes now the time for gnus-group-get-new-news is only 0.3s.

Unfortunately I don't have a working installation of latest gnus
sources. I used:
GNU Emacs 22.1.1 (i686-pc-linux-gnu, GTK+ Version 2.6.4) of 2007-06-09 on rhada

Therefore I attached a tar file containing my patch and two dirs: "old"
contains the version i based my work on. "new" contains my patch.

Please take a look at it. For me this delay was a major flaw in my
daily work with nnmaildir. It would be great if a change like this
could be integrated into gnus/emacs.

Thanks for your attention,
  Christian


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