[Dovecot] compressed mboxes very slow

[Kamil Jońca]

Timo Sirainen <tss at iki.fi> writes:

> On 10.5.2011, at 23.32, Kamil Jońca wrote:
>
>> Timo Sirainen <tss at iki.fi> writes:
>> 
>>> Here are some fixes:
>>> 
>>> http://hg.dovecot.org/dovecot-2.0/rev/15a0687ec9d0
>>> http://hg.dovecot.org/dovecot-2.0/rev/66ec075a49d3
>> 
>> Hard to say, but I can't see any significant improvement after applying
>> them :|
>
> Get strace -tt output of such slowness and send them to me.

Some time ago I complained about very slow mbox. In the meantime I have
no time to check it. But recently I have to use them (compressed
mboxes) again. And no progress :(
Under http://strony.aster.pl/kjonca/mbox.log.gz (WARN: ~170MB)
 is file with output of strace -tt when dovecot try to open
rather huge bzipped mbox. And it took about four hours. 

Second open is a lot faster (about minute), but sometimes message
fetching take  about 30-60s 
KJ



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