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Internet2 Spring Meeting An Introduction to UDT Yunhong Gu [email protected] Robert L. Grossman (Advisor) National Center for Data Mining University of Illinois at Chicago What's UDT? UDT: UDP-based Data Transfer Protocol Application level, end-to-end, unicast, reliable, connection-oriented, streaming data transport protocol. Successor of SABUL Open source C++ Implementation Layered Architecture UDT Socket API UDT OS Socket Interface UDP Memory Copy Avoidance Kernel User Space Applications Flow/Congestion Control AIMD: Additive Increases Multiplicative Decreases Increase Parameter Related to available bandwidth Bandwidth estimation: automatic parameter tuning Decrease Factor Randomized decrease factor: alleviate loss synchronization problem Performance Characteristics Efficiency Approximately constant time to probe 90% of available bandwidth Fairness Intra-protocol fairness (max-min) RTT independent TCP friendly Configurable Congestion Control Kernel User Space Applications UDT Socket API UDT OS Socket Interface UDP CC How to Use UDT? Linux Ported to Windows, UNIX, BSD, and OS X C++ API socket-like API Transport Middleware XIO UDT Driver C API No changes for existing applications, just recompilation and link Limitation: no "fork" Java and Python wrapper Non-objectives and limitations Not a replacement to TCP For bulk data transfer over high-speed wide area networks, where TCP does not work well UDT is designed to co-exist with TCP Built-in control algorithm is not suitable for applications requires real-time, messaging, lossy, or smooth data traffic. Not suitable for high concurrency (a large number of flows sharing the network) http://udt.sf.net UDT Source Code Stable release (v2.0) CVS (most recent update and bug fixes) Technical papers Online documentation Questions? http://udt.sf.net http://www.ncdm.uic.edu [email protected]