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To analyze large-scale systems with high fidelity, it is necessary for a network testbed to offer both realistic emulation (to represent software execution) and effective simulation (to model background computation and communication). The authors present a network testbed that integrates a light-weighted emulation system OpenVZ (modified earlier to operate in virtual time) with a parallel discrete-event network simulator S3F. Their algorithmic contributions lay in the design and management of virtual time as it transitions from emulation, to simulation, and back.
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