Washington, Apr 14 (ANI): A Carnegie Mellon University computer scientist and an Intel researcher duo claim to have designed a system that allows for faster transferring of large data files, such as movies and music, over the Internet.
David G. Andersen, assistant professor of computer science at Carnegie Mellon, and Michael Kaminsky of Intel Research Pittsburgh say the Similarly Enhanced Transfer (SET) system speeds up the download process by configuring the peer-to-peer (P2P) file-sharing services to share not only identical files, but also similar files.
"By identifying relevant chunks of files similar to a desired file, SET greatly increases the number of potential sources for downloads, and boosting the number of sources usually translates into faster P2P downloads," said Andersen.
However, how much SET could speed up downloads would vary depending on a number of factors, including the size and popularity of a given file, he said. In some cases, SET might speed transfers by just five percent; in others, it might make downloads five times faster, he added.
SET speeds by data transfer by simultaneously downloading different chunks of a desired data file from multiple sources, rather than downloading an entire file from one slow source, much like other P2P services such as BitTorrent, Gnutella and ChunkCast.
However, the difference lies in that SET takes additional steps of identifying files that are similar to the desired file, unlike other P2P services where downloads can be slow with networks not finding enough sources to use all of a receiver's download bandwidth.
"This is a technique that I would like people to steal. Though we have no intention of applying it ourselves to movie- or music-sharing services, but it would make P2P transfers faster and more efficient, and developers should just take the idea and use it in their own systems," Andersen said.
"In some sense, the promise of P2P has been greater than the reality. By creating many more sources for data files, P2P reduces bottlenecks for data transfers. But residential Internet service providers allot far more bandwidth for downloading than they do for uploading files, an imbalance that continues to slow P2P data transfers. And members of P2P services often limit their computer's upload capacity so it is not tied up with other peoples' uploads," he added.
Comparison tests on real file downloads between today's P2P networks further revealed that SET improved the transfer time of an MP3 music file by 71 percent. A larger 55-megabyte movie trailer went 30 percent faster using the researchers' techniques to draw from movie trailers that were 47 percent similar.
The findings were presented at the 4th Symposium on Networked Systems Design and Implementation, April 11 in Cambridge, Massachusetts. (ANI)
source: yahho.com
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