[Xen-users] Monitoring domU resource usage

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Using 2.0-testing, what methods are people using to monitor
individual domU CPU usage?

Obviously I can run an snmpd in each domU and see how busy the CPU
is, but that could be tampered with from inside the domU, and as the
domU doesn't know it doesn't have the whole cpu needs some
interpretation.

I can see CPU time used in "xm list" but that looks like rather a
blunt tool - would I have to do something like this for example:

Name              Id  Mem(MB)  CPU  State  Time(s)  Console
Domain-0           0      507    0  r----   7644.0
foo                1      127    1  -b---   2585.9    9601
bar                2       63    1  -b---    147.6    9602

(5 minutes later)

Name              Id  Mem(MB)  CPU  State  Time(s)  Console
Domain-0           0      507    0  r----   7841.5
foo                1      127    1  -b---   2593.2    9601
bar                2       63    1  -b---    184.9    9602

dom0 has used 7841.5-7644.0=197.5 seconds, foo used 7.3s, bar used
37.3s.  In 5 minutes there are 300 seconds so dom0 used
197.5/300*100=65.83% CPU, foo 2.43%, bar 12.43%, machine was 19.31%
idle or overhead.

That still doesn't give a way to tell how much CPU a domU *wanted*
to have, though.  i.e. if a domU could make use of more CPU share if
given it.

Andy

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