Xen devel - Apr 2008 - Problems with host_cpu in XenAPI

I was under the assumption that host_cpu would give me metrics for the
physical CPUs instead of virtual ones. However, when I run the
following code, I only get Dom0''s CPU usage. It does not reflect the
load of any of the other VMs. Is this the expected behavior?

I also noticed that the values are only updated every 2 seconds or so.
Is there any way to tune this interval?

while True:
    recs = session.xenapi.host_cpu.get_all_records()
    for key in recs.keys():
        sys.stdout.write("%0.3f, " %
recs[key][''utilisation''])
    print
    time.sleep(1)

Thanks,
Niraj

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