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Architectural Support for Approximate Computing

Grant number: 18/24177-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2019
Effective date (End): February 28, 2023
Field of knowledge:Physical Sciences and Mathematics - Computer Science - Computer Systems
Principal researcher:Lucas Francisco Wanner
Grantee:Isaías Bittencourt Felzmann
Home Institution: Instituto de Computação (IC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The failure of Dennard Scaling and difficulties in developing multicore architectures have negatively affected the energy efficiency of modern computing systems.Since many applications do not require perfect accuracy, the use of Approximate Computing techniques may trade the final expected quality of operations for energy cost reduction.These hardware level techniques usually optimize energy adjusting external parameters of the circuits, such as supply voltage and frequency, or replacing specific circuits, such as approximate arithmetic units.Approximate Computing has been proved advantageous when evaluated in isolation. However, its applicability in a computing architecture depends on the development of a control mechanism that allows tuning the accuracy level at which an application is run.This mechanism imposes design challenges, such as the latency needed to dynamically control circuit parameters and the need of replication of functional units, which may reduce potential energy savings.This work aims to propose and evaluate integration alternatives of Approximate Computing techniques into a computing architecture, including a control unit that allows operation in both accurate and approximate modes.The project will result in an "approximate" architecture, compatible with modern computing systems, that allows exploring potential gains in applications resilient to approximation and, at the same time, guarantee accuracy in critical and control operations.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FELZMANN, ISAIAS; FABRICIO FILHO, JOAO; WANNER, LUCAS. Risk-5: Controlled Approximations for RISC-V. IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS, v. 39, n. 11, p. 4052-4063, . (18/24177-0)
FILHO, JOAO FABRICIO; FELZMANN, ISAIAS B.; AZEVEDO, RODOLFO; WANNER, LUCAS F.. AxRAM: A lightweight implicit interface for approximate data access. FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE, v. 113, p. 556-570, . (18/24177-0)

Please report errors in scientific publications list by writing to: cdi@fapesp.br.