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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: U DP-based D ata T ransfer Protocol

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An Introduction to UDT

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Internet2 Spring Meeting

An Introduction to UDT

Yunhong [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

Applications

UDT Socket API

User Space

UDT

Memory Copy Avoidance

OS Socket Interface

Kernel

UDP


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

Applications

CC

UDT Socket API

User Space

UDT

OS Socket Interface

Kernel

UDP


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.nethttp:[email protected]


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