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CDNsim is a GNU/LINUX simulation tool for CDNs, written in C++ (core) and python (GUI wizard). It models: redirection policies, cache policies, TCP/IP, batch simulations, statistics extraction and more. CDNsim is uses the OMNet++ library
Simulating Cache based Checkpointing and Rollback schemes are currently performed only at the hardware level for the lack of such simulation software that is generic. NCkptSimulator, a simulation tool, will support different checkpointing schemes