|
Pharos is hierarchical and decentralized network coordinate system. With the help of a simple two-level architecture, it achieves much better prediction accuracy then the representative Vivaldi coordinates, and it is incrementally deployable. == Overview == * Network coordinates (NC) system is an efficient mechanism for Internet latency prediction with scalable measurements. Vivaldi coordinates is the representative distributed NC system, and it is deployed in many well-known Internet systems, such as Bamboo DHT (Distributed hash table), Stream-Based Overlay Network (SBON) and Azureus BitTorrent. * Pharos is a fully decentralized NC system. All nodes in Pharos form two levels of overlays, namely base overlay for long link prediction, and local cluster overlay for short link prediction. Vivaldi algorithm is applied to both base overlay and local cluster. As a result, each Pharos node has two sets of coordinates. The coordinates calculated in the base overlay, which is named global NC, is used for the global scale, and the coordinates calculated in the corresponding local cluster, which is named local NC, covers a smaller range of distance. * To form the local cluster, Pharos uses a method similar to binning and chooses some nodes called anchors to help node clustering. This method only requires a one-time measurement (with possible periodic refreshes) by the client to a small, fixed set of anchors. Any stable nodes which are able to response ICMP ping message can serve as anchor, such as the existing DNS servers. * The experimental results show that Pharos greatly outperforms Vivaldi in Internet distance prediction without adding any significant overhead. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pharos network coordinates」の詳細全文を読む スポンサード リンク
|