[Dovecot] First time Dovecot user, really impressed so far. What is best IMAP enabled webmail package to go with Dovecot?

[Stan Hoeppner]

Timo Sirainen put forth on 1/5/2010 1:32 AM:
> On 5.1.2010, at 7.44, Stan Hoeppner wrote:
> 
>> As we can see from the 1% I/O wait on CPU0 and 0% on CPU1, it's seems pretty
>> clear that the CPUs are being occupied by the dovecot search code, not by disk
>> I/O.
> 
> v1.1+ has somewhat faster search code. At least it's using boyer-moore with some of my own uglyness to make it support incremental searches. Wonder if there's a nicer and faster way to do that than what I implemented.

Hi Timo,

I'm not sure if you saw my original post.  I'm using Dovecot 1.0.15 (Debian
Lenny package) so I'm quite behind the current Dovecot rev.  Also, the (very
basic) search performance data I posted previously is from rather old hardware,
a dual Celeron 550 MHz machine with PC100 RAM, although the SATA controller and
500GB 7.2Krpm (16MB cache) disk are fairly current technology and relatively
speedy.  Though, I don't believe the storage subsystem is much in play during
this search.  The numbers below lead me to believe the mbox file under query is
almost entirely in cache.

Here's some more performance data for the search in question, in case it might
be useful to you:

Cpu0  :  0.2%us,  0.1%sy,  0.0%ni, 99.7%id,  0.1%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  :  0.0%us,  1.0%sy,  0.0%ni, 99.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  :  0.0%us,  1.0%sy,  0.0%ni, 99.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  : 31.4%us,  2.0%sy,  0.0%ni, 66.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  : 41.2%us,  2.9%sy,  0.0%ni, 54.9%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  :  5.9%us,  0.0%sy,  0.0%ni, 94.1%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  :  1.0%us,  1.0%sy,  0.0%ni, 98.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  : 10.8%us,  2.0%sy,  0.0%ni, 87.3%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  : 53.5%us,  4.0%sy,  0.0%ni, 41.6%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  : 11.8%us,  2.0%sy,  0.0%ni, 85.3%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  :  0.0%us,  1.0%sy,  0.0%ni, 99.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu0  :  0.0%us,  1.0%sy,  0.0%ni, 99.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st

Cpu1  :  0.2%us,  0.1%sy,  0.0%ni, 99.7%id,  0.1%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 13.7%us,  1.0%sy,  0.0%ni, 85.3%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 83.3%us,  6.9%sy,  0.0%ni,  8.8%id,  0.0%wa,  0.0%hi,  1.0%si,  0.0%st
Cpu1  : 62.4%us,  5.0%sy,  0.0%ni, 32.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 51.5%us,  4.9%sy,  0.0%ni, 42.7%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 88.1%us,  5.9%sy,  0.0%ni,  5.0%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 92.1%us,  7.9%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 80.2%us,  5.9%sy,  0.0%ni, 12.9%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 41.2%us,  2.0%sy,  0.0%ni, 56.9%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 81.6%us,  3.9%sy,  0.0%ni, 13.6%id,  1.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 92.2%us,  7.8%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  : 82.0%us,  4.0%sy,  0.0%ni, 14.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st

Mem:    387044k total,   319144k used,    67900k free,    21284k buffers
Mem:    387044k total,   319268k used,    67776k free,    21284k buffers
Mem:    387044k total,   319276k used,    67768k free,    21284k buffers
Mem:    387044k total,   319276k used,    67768k free,    21284k buffers
Mem:    387044k total,   319276k used,    67768k free,    21284k buffers
Mem:    387044k total,   319276k used,    67768k free,    21284k buffers
Mem:    387044k total,   319276k used,    67768k free,    21284k buffers
Mem:    387044k total,   319268k used,    67776k free,    21292k buffers
Mem:    387044k total,   319268k used,    67776k free,    21292k buffers
Mem:    387044k total,   319268k used,    67776k free,    21292k buffers
Mem:    387044k total,   319268k used,    67776k free,    21292k buffers
Mem:    387044k total,   319268k used,    67776k free,    21292k buffers

Swap:   995988k total,      440k used,   995548k free,   232492k cached
Swap:   995988k total,      440k used,   995548k free,   232500k cached
Swap:   995988k total,      440k used,   995548k free,   232512k cached
Swap:   995988k total,      440k used,   995548k free,   232556k cached
Swap:   995988k total,      440k used,   995548k free,   232576k cached
Swap:   995988k total,      440k used,   995548k free,   232596k cached
Swap:   995988k total,      440k used,   995548k free,   232608k cached
Swap:   995988k total,      440k used,   995548k free,   232620k cached
Swap:   995988k total,      440k used,   995548k free,   232660k cached
Swap:   995988k total,      440k used,   995548k free,   232676k cached
Swap:   995988k total,      440k used,   995548k free,   232688k cached
Swap:   995988k total,      440k used,   995548k free,   232696k cached

--
Stan