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Section: Software

V-Grid

This project is in its early stage. It started officially in September 2004. V-Grid is a virtualization software for large scale distributed system emulation. This software allows folding a distributed systems 100 or 1000 times larger than the experimental testbed. V-Grid virtualizes distributed systems nodes on PC clusters, providing every virtual node its proper and confined operating system and execution environment. Thus compared to large scale distributed system simulators or emulators (like MicroGrid), V-Grid virtualizes and schedules a full software environment for every distributed system node. V-Grid research concerns emulation realism and performance. A first work concerns the definition and implementation of metrics and methodologies to compare the merits of distributed system virtualisation tools. Since there is no previous work in this domain, it is important to define what and how to measure in order to qualify a virtualization system relatively to realism and performance. We defined a set of metrics and methodologies in order to evaluate and compared virtualisation tools for sequential system. For example a key parameter for the realism is the event timing: in the emulated environment, events should occur with a time consistent with a real environment. An example of key parameter for the performance is the linearity. The performance degradation for every virtual machine should evolve linearly with the increase of the number of virtual machines. We conducted a large set of experiments, comparing several virtualisation tools including Vserver, VMware, User Mode Linux, Xen, etc. The result demonstrates that none of them provides both enough realism and performance. As a consequence, we are currently studying approaches to cope with these limits.


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