UDT: Breaking the Data Transfer Bottleneck

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UDT is a reliable UDP based application level data transport protocol for distributed data intensive applications over wide area high-speed networks. UDT uses UDP to transfer bulk data with its own reliability control and congestion control mechanisms. The new protocol can transfer data at a much higher speed than TCP does. UDT is also a highly configurable framework that can accommodate various congestion control algorithms. (Presentation: PPT 311KB / Poster: PDF 435KB )

Supercomputing 2008 Bandwidth Challenge Winner

Supercomputing 2006 Bandwidth Challenge Winner

Key Features

Fast. UDT is designed for extremely high speed networks and it has been used to support global data transfer of terabyte sized data sets.

Fair and Friendly. Concurrent UDT flows can share the available bandwidth fairly, while UDT also leaves enough bandwidth for TCP.

Easy to Use. UDT resides completely at the application level. Users can simply download the software and start to use it. No kernel reconfiguration is needed. In addition, UDT's API is very similar to the traditional socket API so that existing applications can be easily modified.

Highly Configurable. UDT supports user defined congestion control algorithms with a simple configuration. Users may also modify UDT to suit various situations. This feature can also be used by students and researchers to investigate new control algorithms.

Firewall Friendly. UDT is completely based on UDP, which makes it easier to traverse the firewall. In addition, multiple UDT flows can share a single UDP port, thus a firewall can open only one UDP port for all UDT connections. UDT also supports rendezvous connection setup.

We now offer UDT consulting services, including but not limited to: 1) system diagnosis and tuning for high speed data transfer; 2) UDT customization to fit your specific application requirements; and 3) UDT development training. Please email Yunhong Gu <yunhong.gu at gmail dot com> with a brief description of your system. Please note that this service is NOT associated with UIC or NCDM.

We have released version 4.5a, which includes several critical bug fixes since the last version. An updated congestion control algorithm is introduced to help UDT work better in low bandwidth environments, while still achieving high performance in high speed networks. Version 4.5a also introduces the new selectEx API, which can handle large number of UDT sockets efficiently. Thanks to everyone for helping us improve the software!

UDT was featured in a press release by National Science Foundation (NSF) titled "Data Travels Six Times Faster in the Clouds": The National Center for Data Mining (NCDM) established a cloud computing system (Sector) that can quickly compile data from widely geographically distributed data centers across high performance networks. Sector employs an alternative network protocol called UDT designed to swiftly and smoothly transfer data.Full story...

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