Virtualization tools are becoming popular in the context of Grid Computing because they allow running multiple operating systems on a single host and provide a confined execution environment. Emulators and experimental tools like Microgrid and PlanetLab use multiple virtual nodes on every platedorm nodes. Thus, to build a large scale emulator for Grid/P2P experiments, developers have to select a virtualization tool among the available ones. In this paper, the authors first present a set of metrics and related methodologies for performances and for usability evaluation. The authors use these metrics to compare 4 virtual machine technologies (Vserver, Xen, UML and VMware), in the context of large scale emulation.
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