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Measures reported by XenCpuTest
This XenCpuTest reports the real-time CPU utilization statistics pertaining to the control domain and every processor supported by the XenServer. The control domain is a privileged VM that provides low-level services to other VMs, such as providing access to physical devices. It also runs the management tool stack.
Using this test, administrators can determine whether there is a resource-contention at the XenServer host, and if so, where - at the control domain? or with the processors supported by the host?
| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Cpu_util |
Indicates the percentage of physical CPU used by this processor or the control domain |
Percent |
A very high value for this measure indicates excessive CPU utilization by that processor or control domain. The CPU utilization may be high because a few processes are consuming a lot of CPU, or because there are too many processes contending for a limited resource. If adequate CPU resources are not available to the host, then the guests too would experience a resource crunch; this in turn, could cause significant slowdowns in the execution of applications hosted by the guests.
A high value for the control_domain descriptor indicates that one/more control domain processes are consuming CPU resources excessively. The detailed diagnosis capability that is available only for the control_domain descriptor, will list the CPU-intensive processes executing on the control domain. Resource intensive processes can be killed/stopped to avoid excessive CPU usage. Alternatively, administrators can allocate additional CPU resources to the host to ensure that processes have adequate memory for execution.
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Note:
In case of multi-processor systems, this test typically reports the CPU usage for every processor. The Summary descriptor reports the average CPU usage across processors.
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