[Dovecot] Some benchmarking

[Timo Sirainen]

So I finally got the new mail caching code fully working in normal 
conditions. Index rebuilding and some error correction still needs a 
bit work. mbox is also still broken. Anyway, I was mostly interested 
how fast Dovecot now works with my 367000 LKML mails, but thought I'd 
have to get something to compare the results against, so here's Dovecot 
vs. Courier.

Results against older Dovecot would have been pretty boring, the older 
Dovecot could never perform threading without  opening all the files 
and reading References-headers from them. Sorting would could have been 
done from cache if IMAP ENVELOPEs were cached, I'd estimate maybe 2-3x 
larger user CPU usage with it and a _lot_ larger cache file since it 
would have stored from, to, etc. fields in it.

Results against Cyrus would be interesting. I'll probably do those 
sometimes later too.. Last I checked, Cyrus was very slow at inserting 
the mails into it's database, it took .. was it 1-3 hours to insert all 
those mails, while a simple copying took maybe 20 mins. Anyway, Cyrus's 
caching is pretty dummy as well so I'd expect Dovecot to be many times 
faster in threading and likely somewhat faster in sorting.

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