On 11/24/2014 12:47 PM, Robert Moskowitz wrote:
It isn't exactly lightweight. That's why I am sticking with only
nolisting and clam and uri milters without spamassassin.
It might also be worth checking what your disk I/O and swapping are
like, since on a Pi clamd alone will be eating about 1/2 of the RAM.
# free
total used free shared buffers cached
Mem: 2050624 1584976 465648 360 265588 761744
-/+ buffers/cache: 557644 1492980
Swap: 4193276 1276 4192000
How can I get a measure of disk I/O?
iostat -x 1
varying numbers. Here is one of the higher ones:
avg-cpu: %user %nice %system %iowait %steal %idle
3.21 0.06 3.25 0.38 0.00 93.11
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
avgqu-sz await svctm %util
sda 0.00 0.32 0.01 0.49 0.45 13.22 27.20
0.02 31.05 17.69 0.89
avg-cpu: %user %nice %system %iowait %steal %idle
45.00 0.00 6.00 3.00 0.00 46.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
avgqu-sz await svctm %util
sda 0.00 25.00 0.00 4.00 0.00 232.00
58.00 0.06 15.00 15.00 6.00
Is this in a random period when you were watching or during a period
when you were experiencing overloads? You really should set up some kind
of monitoring (nagios/cacti/zabbix) and get some high resulution graphs
on what's going on with various aspects of load (cpu usage, load
average, disk I/O) at the specific times when the overloads are occurring.
If you are seeing the %util abouve 80% you are probably bottlenecked
on disk I/O.
iotop might also help.
Had to install this, and it really does not report any activity. Things
are probably happening too fast for too short of a time.
I believe it show cumulative figures between refreshes, like top.
But the tables are small. domain has 4 entries and is hit all the
time. mailbox has a dozen entries and is hit for every incoming message
at least once. Does mysql do a good job of caching?
Yes, provided it's configuration is appropriate (big enough buffer pools
and table handle caches).
Gordan
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