def test_get_samples(self):
next_value = iter((
virt_inspector.MemoryBandwidthStats(total=1892352, local=1802240),
virt_inspector.MemoryBandwidthStats(total=1081344, local=90112),
))
def inspect_memory_bandwidth(instance, duration):
return next(next_value)
self.inspector.inspect_memory_bandwidth = mock.Mock(
side_effect=inspect_memory_bandwidth)
mgr = manager.AgentManager(0, self.CONF)
def _check_memory_bandwidth_total(expected_usage):
pollster = memory.MemoryBandwidthTotalPollster(self.CONF)
samples = list(pollster.get_samples(mgr, {}, [self.instance]))
self.assertEqual(1, len(samples))
self.assertEqual(set(['memory.bandwidth.total']),
set([s.name for s in samples]))
self.assertEqual(expected_usage, samples[0].volume)
def _check_memory_bandwidth_local(expected_usage):
pollster = memory.MemoryBandwidthLocalPollster(self.CONF)
samples = list(pollster.get_samples(mgr, {}, [self.instance]))
self.assertEqual(1, len(samples))
self.assertEqual(set(['memory.bandwidth.local']),
set([s.name for s in samples]))
self.assertEqual(expected_usage, samples[0].volume)
_check_memory_bandwidth_total(1892352)
_check_memory_bandwidth_local(90112)
def inspect_memory_bandwidth(self, instance, duration=None):
domain = self._get_domain_not_shut_off_or_raise(instance)
try:
stats = self.connection.domainListGetStats(
[domain], libvirt.VIR_DOMAIN_STATS_PERF)
perf = stats[0][1]
return virt_inspector.MemoryBandwidthStats(total=perf["perf.mbmt"],
local=perf["perf.mbml"])
except (KeyError, AttributeError) as e:
# NOTE(sileht): KeyError if for libvirt >=2.0.0,<2.3.0, the perf
# subsystem ws existing but not these attributes
# https://github.com/libvirt/libvirt/commit/bae660869de0612bee2a740083fb494c27e3f80c
msg = _('Perf is not supported by current version of libvirt, and '
'failed to inspect memory bandwidth of %(instance_uuid)s, '
'can not get info from libvirt: %(error)s') % {
'instance_uuid': instance.id,
'error': e
}
raise virt_inspector.NoDataException(msg)
# domainListGetStats might launch an exception if the method or
# mbmt/mbml perf event is not supported by the underlying hypervisor
# being used by libvirt.
except libvirt.libvirtError as e:
msg = _('Failed to inspect memory bandwidth of %(instance_uuid)s, '
'can not get info from libvirt: %(error)s') % {
'instance_uuid': instance.id,
'error': e
}
raise virt_inspector.NoDataException(msg)