Energy-Efficient Computing: SPEED Disks Lecture Overview
This lecture covers various aspects of energy-efficient computing focusing on SPEED disks, disk power performance, load variations, and power management approaches. It discusses the challenges faced by networked disks, efficiency gains with different load levels, and the impact of multi-speed technologies. Understanding disk power consumption components, idle power usage, and quadratic power characteristics are also highlighted.
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Presentation Transcript
CSE 591: Energy-Efficient Computing Lecture 20 SPEED: disks Anshul Gandhi 347, CS building anshul@cs.stonybrook.edu
Idle Does not work well for networked disks Why?
Combined low load (50%) 41% savings Combined uses high-performance + laptop disks
Combined high load (80%) 1% savings 1. Energy spent in maintaining coherence is small 2. Disk demand is typically high
Multi-speed (80% and 90% load) 22% savings 16% savings Multi-speed uses high-performance + desktop disks
Multi-speed (performance) 3% degradation
Power Management approaches AlwaysOn TPM (Sleep) DRPM (Speed) At high load, all are same (= AlwaysOn) At low load, TPM is good since high IAT In between, DRPM is good
Disk power consumption Many components Spindle motor (rotations) Actuator (seeks) Disk cache Electrical components Mechanical components (motor, actuator) are main Spindle can consume 50-80% power (2/10 disks)
Idle power Idle = still spinning
Results No performance degradation allowed
