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OPSS stands for Overlay P2P Streaming Simulator and is is designed to simulate a large scale (i.e. in the order of 100K nodes) peer to peer streaming system. OPSS is able to simulate a fair (i.e. “TCP-like”) sharing of the uplink and downlink bandwidth of each peer among the different peers that are connected. OPSS is based on an existing simulator for TCP-like bandwidth sharing and it offers the possibility to implement the logic of the P2P distribution algorithm as separate module. Therefore it allows to simulate the behavior of arbitrary tree-based or mesh-based approaches. OPSS is able to ti simulate hundred thousands of peers that exchange data using a single computer. Check why OPSS achieve scalability here.