[Dovecot] Benchmark: Appending 250k messages

[Timo Sirainen]

I just changed Dovecot v1.1 code to work much more nicely when appending
new messages to large mailboxes.

Dovecot hg (cydir format, fsync_disable=yes):

./imaptest secs=1
./imaptest - append=100,0 logout=0 msgs=10000000 clients=1 seed=1 secs=300

Logi Sele Appe 
100% 100% 100% 
   1    1 2322   1/  1
   0    0 1998   1/  1
   0    0 2293   1/  1
   0    0 2009   1/  1
   0    0 1789   1/  1
   0    0 1245   1/  1
   0    0   43   1/  1
   0    0   32   1/  1
   0    0  881   1/  1
   0    0 2137   1/  1
..
   0    0  704   1/  1
   0    0  771   1/  1
   0    0  388   1/  1
   0    0  831   1/  1
   0    0  572   1/  1
   0    0  766   1/  1
Totals:
   1    1 251397 

Averaging 837/sec. The append speed jumps around quite a lot. Typically
it's around 800-1000/sec, but it jumps between 0-500/sec also quite
often. I'm not sure why that is.

Cyrus v2.3.8 (fsync and fdatasync calls disabled from code):

./imaptest - append=100,0 logout=0 msgs=10000000 clients=1 seed=1 secs=300
Logi Sele Appe 
100% 100% 100% 
   1    1 2587   1/  1
   0    0 1907   1/  1
   0    0 1597   1/  1
   0    0 1260   1/  1
   0    0 1220   1/  1
   0    0 1151   1/  1
   0    0 1068   1/  1
..
   0    0  121   1/  1
   0    0  127   1/  1
   0    0  128   1/  1
   0    0  126   1/  1
Totals:
   1    1 79613 

Averaging 265/sec. The speed slows down pretty consistently, there's no
jumping like with Dovecot.
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