Canceling this defect since the scenario is using an out-of-tree compute
virt driver (PowerVM).
** Changed in: nova
Status: In Progress => Invalid
** Changed in: nova
Assignee: Joe Cropper (jwcroppe) => (unassigned)
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https://bugs.launchpad.net/bugs/1282702
Title:
Division by 0 error in CPU monitor
Status in OpenStack Compute (Nova):
Invalid
Bug description:
When enabling the CPU monitor, the code calculcates cputime as cputime
= float(stats["total"] - self._cpu_stats.get("total", 0)) ... under
normal scenarios, this is fine.
However, if the underlying stats haven't changed since the previous
call, the cputime can be 0 if the underlying stats haven't changed,
which results in nova-compute errors such as:
2014-02-20 12:29:48.949 81658 ERROR nova.compute.resource_tracker [-] float
division
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker Traceback
(most recent call last):
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker File
"/usr/lib/python2.6/site-packages/nova/compute/resource_tracker.py", line 277,
in _get_host_metrics
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker metrics
+= monitor.get_metrics(nodename=nodename)
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker File
"/usr/lib/python2.6/site-packages/nova/compute/monitors/__init__.py", line 100,
in get_metrics
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker ret =
func(self, **kwargs)
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker File
"/usr/lib/python2.6/site-packages/nova/compute/monitors/virt/cpu_monitor.py",
line 74, in wrapper
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker
self._update_cpustat()
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker File
"/usr/lib/python2.6/site-packages/nova/compute/monitors/virt/cpu_monitor.py",
line 151, in _update_cpustat
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker perc =
(stats["user"] - self._cpu_stats.get("user", 0)) / cputime
2014-02-20 12:29:48.949 81658 TRACE nova.compute.resource_tracker
ZeroDivisionError: float division
The fix for this is probably to ensure that cputime is non-zero before
continuing the logic.
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