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

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Khatib, M.G. and Zwaag van der, B.J. and Hartel, P.H. and Smit, G.J.M. (2007) Interposing Flash between Disk and DRAM to Save Energy for Streaming Workloads. [Report]

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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:Report
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/64158
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