DocumentCode :
2666914
Title :
Presence-based availability and P2P systems
Author :
Dunn, Richard J. ; Zahorjan, John ; Gribble, Steven D. ; Levy, Henry M.
Author_Institution :
Washington Univ., Seattle, WA, USA
fYear :
2005
fDate :
31 Aug.-2 Sept. 2005
Firstpage :
209
Lastpage :
216
Abstract :
The availability of a P2P service is a function of the individual peers´ availabilities, and it is often desirable to estimate how available a particular P2P service will be given the availability of its peers. Prior work in this area has widely used the fraction of time the average peer is available as the basis for this estimate. It is shown that this approach has serious drawbacks. The authors developed a different measure, which is called presence-based availability, which takes into account the availability of the individual peers. Using traces of live P2P systems taken from the literature, the authors demonstrated that presence-based availability is a more reliable indicator of potential performance than prior methods. It is shown that this metrics successfully estimate the availability of a P2P file-sharing system. Then, using presence-based measures to make a better estimate of a parameter in a highly-available system, we achieve a 75% decrease in resource usage relative to an existing technique relying on traditional metrics.
Keywords :
peer-to-peer computing; file sharing system; peer to peer system; presence based availability; Availability; Internet; Parameter estimation; Peer to peer computing; Reflection;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Peer-to-Peer Computing, 2005. P2P 2005. Fifth IEEE International Conference on
Print_ISBN :
0-7695-2376-5
Type :
conf
DOI :
10.1109/P2P.2005.27
Filename :
1551043
Link To Document :
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