Interposing Flash between Disk and DRAM to Save Energy for Streaming Workloads


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Khatib, M.G. and Zwaag, B.J. van der and Hartel, P.H. and Smit, G.J.M. (2007) Interposing Flash between Disk and DRAM to Save Energy for Streaming Workloads. In: IEE/ACM/IFIP Workshop on Embedded Systems for Real-Time Multimedia, ESTImedia 2207, 4-5 Oct 2007, Salzburg, Austria (pp. pp. 7-12).

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Abstract:In computer systems, the storage hierarchy, composed of a disk drive and a DRAM, is responsible for a large portion of the total energy consumed. This work studies the energy merit of interposing flash memory as a streaming buffer between the disk drive and the DRAM. Doing so, we extend the spin-off period of the disk drive and cut down on the DRAM capacity at the cost of (extra) flash.

We study two different streaming applications: mobile multimedia players and media servers. Our simulated results show that for light workloads, a system with a flash as a buffer between the disk and the DRAM consumes up to 40% less energy than the same system without a flash buffer. For heavy workloads savings of at least 30% are possible. We also address the wear-out of flash and present a simple solution to extend its lifetime.
Item Type:Conference or Workshop Item
Copyright:© 2007 IEEE
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/64407
Official URL:http://dx.doi.org/10.1109/ESTMED.2007.4375793
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