The Balance Mechanism Of Power And Performance In The Virtualization

With the datacenter becomes increasingly large in size,the energy consumption in datacenter grows rapidly.Energy saving in datacenter becomes a big theme.In multicore environment,virtualization provides an effective way to address this problem.Virtual machines(VMs)with their own tasks are run on the physical CPUs.Since taking the different task,VMs present different affinity with physical resource.Take advantage of this affinity information is good for VM running performance and energy consumption.In this paper,in order to determine the balance of Energy-Delay product as energy performance standards,we introduce three parameters to describe the characteristics of virtual CPU,CPU-bound,memory-bound and network I/O-bound,and design an Affinity Coefficient(AC)computational formula to measure the affinity between virtual CPU(VCPU)and physical CPU(PCPU).According this affinity,we present a novel scheme which combines the VM placement algorithm.Based on the mapping method,we changed the traditional method of frequency scaling by the feature of memory-bound application to balance the power and performance.Through the benchmark experiment on KVM,the result prove this scheme can get better task running EDP in multicore environment.