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


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
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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