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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 l.jpg

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 l.jpg
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 l.jpg
Layered Architecture

Applications

UDT Socket API

User Space

UDT

Memory Copy Avoidance

OS Socket Interface

Kernel

UDP


Flow congestion control l.jpg
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 l.jpg
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 l.jpg
Configurable Congestion Control

Applications

CC

UDT Socket API

User Space

UDT

OS Socket Interface

Kernel

UDP


How to use udt l.jpg
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 l.jpg
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 l.jpg
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 gu@lac uic edu l.jpg
Questions?http://udt.sf.nethttp:[email protected]


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