NPS is a novel non-intrusive web prefetching
system that (1) utilizes only spare resources to avoid interference between
prefetch and demand requests at the server as well as in the network, and
(2) is deployable without any modifications to servers, browsers, network
or the HTTP protocol. NPS's self-tuning architecture eliminates the
need for traditional ``thresholds'' or magic numbers typically used to limit
interference caused by prefetching, thereby allowing applications to improve
benefits and reduce the risk of aggressive prefetching.
NPS avoids interference with demand requests by monitoring the responsiveness of the server and accordingly throttling the prefetch aggressiveness, and by using TCP-Nice, a congestion control protocol suitable for low priority transfers. NPS avoids the need to modify existing infrastructure by modifying HTML pages to include Javascript® code that issues prefetch requests and by wrapping the server infrastructure with several simple external modules that require no knowledge of or no modifications to the internals of existing servers. Our measurements of the prototype under a web trace indicate that NPS is both non-interfering and efficient under different network load and server load conditions.
Please find more details in the following papers:
NPS Software
Questions? Comments? Help needed?
NPS avoids interference with demand requests by monitoring the responsiveness of the server and accordingly throttling the prefetch aggressiveness, and by using TCP-Nice, a congestion control protocol suitable for low priority transfers. NPS avoids the need to modify existing infrastructure by modifying HTML pages to include Javascript® code that issues prefetch requests and by wrapping the server infrastructure with several simple external modules that require no knowledge of or no modifications to the internals of existing servers. Our measurements of the prototype under a web trace indicate that NPS is both non-interfering and efficient under different network load and server load conditions.
Please find more details in the following papers:
- NPS: A Non-interfering Deployable Web Prefetching System Ravi Kokku, Praveen Yalagandula, Arun Venkataramani and Mike Dahlin. 4th USENIX Symposium on Internet Technologies and Systems (USITS 2003), Mar 2003, Seattle, USA.
- TCP Nice: A
Mechanism for Background Transfers Arun Venkataramani, Ravi Kokku and
Mike Dahlin. In the 5th Symposium on Operating Systems Design and Implementation
(OSDI 2002), Dec 2002, Boston, USA.
NPS Software
- To download the tarball of NPS, click here.
- After untarring the above tarball, follow the README in the main directory.
- To download TCP-Nice, click here.
Questions? Comments? Help needed?
- If you think the README is not sufficient, which is quite likely
:-), please send email to one of {rkoku, ypraveen, arun}@cs.utexas.edu