[libvirt-users] cpu time totals
Hi!
I'm comparing the cpu usage of a VM from virDomainGetInfo and the
usages returned per-vcpu from virDomainGetVcpus and the totals do
not match up.
I expect that the cpu usages reported per-vcpu, when summed, should
equal the total cpu usage of the domain, but there is quite a large
gap between them. Is there something I'm missing?
See this example code using the python bindings:
>> import libvirt
>> c = libvirt.open('qemu:///system')
>> d = c.lookupByID(51)
>> d.info()[4]
111390000000L
>> d.vcpus()[0]
[(0, 1, 12720000000L, 1), (1, 1,
2980000000L, 0), (2, 1, 3150000000L, 1), (3, 1, 2600000000L, 0)]
>> sum([vcpu[2] for vcpu in d.vcpus()[0]])
21520000000L
>> d.info()[4] - sum([vcpu[2] for vcpu in d.vcpus()[0]])
91760000000L
Why is this additional 91 seconds not reflected in time spent by the
vcpus? What exactly is the meaning of the cpuTime parameter of the
virVcpuInfo struct?
Thanks,
--Igor
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