[Dovecot] index file vs. memory

[Gunter Ohrner]

Am Mittwoch, 22. Februar 2006 15:00, schrieb Timo Sirainen:
> Create ~/dovecot.rawlog directory.

Ok, now it works and is rather enlightening.

I wasn't able to create a good testcase yet, especially as my "server" 
gets THAT slow with rawlog enabled that I'll set up a dovecot test 
installation on my AMD64 workstation instead. This machine is also fast 
enough to run meaningful tests with the Valgrind memcheck skin.

However, the rawlog revealed one rason, why kMail might behave differently 
than the tests suggested so far: Besides moving, marking and deleting 
messages, kMail also *searches* all messages which are modified: kMail 
remebers the last search done in a kind of virtual folder which seems to 
be updated constantly. This causes kmail to issue thousands of search 
commands of thousands of messages are involved in an operation... So 
maybe the bug in dovecot itself is a small leak in command processing, 
and the heap grows command for command by a few bytes which could explain 
the relatively slow growth experienced by others and the relatively huge 
growth seen by me...

Copying / moving is also done with hundrets of individual commands, each 
command listing about 10 article numbers or ranges. I guess kMail 
copies / moves the messages in the order in which they are displayed and 
only uses ranges inside the number lists if some messages displayed 
coincidentially span a range of message numbers.

Greetings,

  Gunter

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