By Topic

TACLC: Timing-Aware Cache Leakage Control for Hard Real-Time Systems

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Yi-Jung Chen ; National Taiwan University, Taipei ; Chia-Lin Yang ; Jaw-Wei Chi ; Jian-Jia Chen

Leakage energy consumption is an increasingly important issue as the technology continues to shrink. Existing leakage reduction techniques for hard real-time systems utilize slack to turn off a CPU completely. However, turning on/off a processor involves high performance and energy overheads. Hence, a hard real-time system is very likely to have unutilized slack if only the CPU shutdown technique is used to reduce leakage. Architectural-level shutdown techniques in all instances have a much lower overheads than turning off a CPU; therefore, they can be utilized in a hard real-time system to further reduce CPU leakage. However, existing architecture-level shutdown techniques cause unpredictable performance degradation thereby unsuitable for a hard real-time system that must meet the timing constraint in all cases. This paper is the first attempt to bridge this gap. This paper focuses on cache leakage reduction and proposes the first Timing-Aware Cache Leakage Control (TACLC) mechanism. TACLC exploits system slack to turn cache lines into low-leakage states provided that the timing constraint is met. The experimental results demonstrate that TACLC effectively utilizes system slack to reduce cache leakage. For systems with low CPU utilization, TACLC achieves comparable leakage reduction to the leakage control policy that aggressively turns cache lines into low-leakage modes while neglecting the timing constraint.

Published in:

IEEE Transactions on Computers  (Volume:60 ,  Issue: 6 )