Abstract: In order to avoid the overload of Xen virtual machine system executing network I/O-intensive workload caused by the CPU resource exhaustion of Domain0 and solve the linear programming between the average perfor-mance and the number of guest domains when executing computing-intensive workload,two workload type-dependent perfor-mance models were proposed.Firstly,the network I/O request number computing models under the constraint of CPU core-sharing or CPU core-isolation were established by analyzing the CPU resource usage law of Xen virtual machine system executing network I/O-intensive workload.Secondly,the average performance analyzing models of guest domains executing computing-intensive workload were established by analyzing the relation between the average perfor-mance of multiple uniform guest domains concurrently executing computing-intensive workload and the performance of a same guest domain executing the same workload.The experimental results indicate that two performance models can effectively limit the network I/O request number of guest domains to prevent Xen virtual machine system from overloading and figure out the scalability number of guest domains in Xen virtual machine system executing computing-intensive workload with given computing resource respectively.

Key words: Xen,Virtualization,Virtual machine system,Performance model,Computing workload