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PowerTool

Beacon Interval. A. ATIM. A. D. B. Node A. A. B. R. P. B. Node B. A. L. A. L. A. L. ATIM. ATIM. Node C. A: Active L: Low Power. R. B. Beacon. D. Data. ATIM ACK. Data ACK. P. Wi > 1 seconds. Active. Low Power. Wt > 3 seconds. PowerTool. Programmable

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PowerTool

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  1. Beacon Interval A ATIM A D B Node A A B R P B Node B A L A L A L ATIM ATIM Node C A: Active L: Low Power R B Beacon D Data ATIM ACK Data ACK P Wi > 1 seconds Active Low Power Wt > 3 seconds PowerTool Programmable Power Supply Powermon PerfMon SCL A ATIM High-precision Data Acquisition Device Characterizing and Conserving Energy Consumption in Mobile P2P SystemsSelim Gürün, Priya Nagpurkar, and Ben ZhaoDepartment of Computer Science, U.C. Santa Barbara Stargate and Our Evaluation Bench Breaking News… Chimera: A Light-Weight P2P Protocol In Challenging iPod, Microsoft Hustles, Samsung Stutters • Light-weight, structured P2P protocol based on Tapestry • Developed in UCSB-CURRENT lab • Implemented in C as an application library • Easy to port: Requires (only) OpenSSL, arm-gcc is fine! • Chimera-CHAT • A generic, command-line based chat application • Forwards messages based on destination host’s node identifier • Chimera Internals • Borrows many concepts from Tapestry, e.g. circular address space • Prefix based routing: O(log(n)) hops in average • Nodes keep links to nodes in close proximity for stability .... The U.S. software maker also boasted that Zune has what iPod doesn’t have, music-sharing capability. Using its Wi-Fi wireless function, Zune users will be able to detect one another and then share songs, recordings and pictures wirelessly. ….. By Cho Jin-seo, Staff Reporter September 15, 2006 • How to implement P2P applications/routing stacks on resource-constrained mobile devices? Wireless Card Sleep Policy Can we use Chimera network manager for better energy savings? Underlying Research Questions • What are the resource constraints of mobile devices and what makes P2P more challenging on such devices? • How do current P2P protocols utilize mobile device resources, especially the limited energy supply • Can we implement a mobile-friendly, energy-efficient P2P application on such devices? How? Chimera –Energy Consumption Results • CPU utilization is low • We do not observe any significant increase in CPU load when we increase network size from 25 nodes to 200 • Techniques like voltage/clock scaling can reduce CPU energy consumption significantly • Analyzes with much larger networks pending! • Wireless utilization is also low • Idle 70% of the time, in average • Better utilization of wireless interface needed • Compared results to TMSNC • A command line based MSN client • Not a substantial difference Wi: Wireless Idle time Wt: Wake up timeouts for checking network state Future Directions • Our Goal: A resource-aware, energy efficient P2P protocol • Tapestry like, Java based implementations not suitable for mobile platforms • Chimera: Surprisingly efficient! • Physical layer power saving protocols useful but not enough! • More savings possible with more feedback from P2P protocol layer to physical layer. • A lot of work is ongoing • Compare power saving methods • Evaluate in much larger mobile communities

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