Files in this item



application/pdfHenry_Duwe.pdf (424kB)
(no description provided)PDF


Title:Exploiting application level error resilience via deferred execution
Author(s):Duwe, Henry
Advisor(s):Kumar, Rakesh
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):approximate computing
low energy computing
Abstract:Many programs exhibit application level error resilience which allows certain subcomputations to execute in an imprecise, yet energy efficient manner, potentially yielding significant overall energy savings without sacrificing end- to-end quality. In this thesis we identify one fundamental problem that must be addressed to realize these energy benefits: even in applications with a large degree of error resilience, error resilient instructions are interleaved with instructions that must be executed precisely at a fine-grained level (about every seven instructions). This interleaving prohibits any energy savings due to the significant costs associated with switching between the modes, typically via voltage scaling, which may require hundreds to thousands of cycles to transition between levels. We propose a novel execution model for single-core architectures that reduces total switching by deferring execution of instructions requiring mode switches, thereby aggregating instructions of the same energy mode and reducing the number of mode switches. Deferred execution introduces overheads of its own due to data transfer across the two modes, and we present hardware and software optimizations to mitigate these overheads, yielding up to 9%-29% energy savings across a suite of benchmarks.
Issue Date:2013-05-24
Rights Information:Copyright 2013 Henry Duwe
Date Available in IDEALS:2013-05-24
Date Deposited:2013-05

This item appears in the following Collection(s)

Item Statistics