Just started playing with Munin as a potentially better option than
Cacti
(hard to automate) for trending. I have about 30 hosts being watched by
munin. The munin update job (which fetches and regenerates graphs, etc), by
default, runs every 5 minutes. It takes almost 4 minutes to run on a 2.5gHz
host. If we add any more things to monitor it's likely that we'll soon overrun
the 5 minute interval.
Examining the process, it looks like most of the time is spent generating
graphs. read more »