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→Monitoring Virtual Machine Performance
The ''virt-manager'' tool provides information on CPU and memory usage for each guest operating system. To view the performance graphs, select the desired guest OS in the ''virt-manager'' main window and click on ''Details''. The ''Virtual Machine Details'' screen will display two real-time graphs showing the Memory and CPU usage for the selected guest:
[[Image:xen_monitoringkvm_monitoring.jpg|Monitoring Xen KVM Guest memory/cpu Performance]]
In addition, the ''virt-manager'' main window displays smaller CPU graph and Memory scale next to each guest OS together with a bar indicating the percentage of overall available memory used by each operating system:
[[Image:xen_memory_percentagekvm_memory_percentage.jpg|Xen kvm VM memory percentage usage]]
The overall performance statistic of the host operating system may similarly be viewed by selecting the host OS in ''virt-manager'' (typically Domain-0) and clicking ''Edit->Machine details...''.