research-article

Virtualizing a Post-Moore’s Law Analog Mesh Processor: The Case of a Photonic PDE Accelerator

Authors:

Engin Kayraklioglu,

Hamid Reza Imani,

Mario Miscuglio,

Volker J. Sorger,

Tarek El-GhazawiAuthors Info & Claims

ACM Transactions on Embedded Computing Systems, Volume 22, Issue 2

Article No.: 38, Pages 1 - 26

https://doi.org/10.1145/3544971

Published: 24 January 2023 Publication History

Abstract

Innovative processor architectures aim to play a critical role in future sustainment of performance improvements under severe limitations imposed by the end of Moore’s Law. The Reconfigurable Optical Computer (ROC) is one such innovative, Post-Moore’s Law processor. ROC is designed to solve partial differential equations in one shot as opposed to existing solutions, which are based on costly iterative computations. This is achieved by leveraging physical properties of a mesh of optical components that behave analogously to lumped electrical components. However, virtualization is required to combat shortfalls of the accelerator hardware. Namely, (1) the infeasibility of building large photonic arrays to accommodate arbitrarily large problems and (2) underutilization brought about by mismatches in problem and accelerator mesh sizes due to future advances in manufacturing technology. In this work, we introduce an architecture and methodology for lightweight virtualization of ROC that exploits advantages borne from optical computing technology. Specifically, we apply temporal and spatial virtualization to ROC and then extend the accelerator scheduling tradespace with the introduction of spectral virtualization. Additionally, we investigate multiple resource scheduling strategies for a system-on-chip (SoC)-based PDE acceleration architecture and show that virtual configuration management offers a speedup of approximately 2×. Finally, we show that overhead from virtualization is minimal, and our experimental results show two orders of magnitude increased speed as compared to microprocessor execution while keeping errors due to virtualization under 10%.

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Virtualizing a Post-Moore’s Law Analog Mesh Processor: The Case of a Photonic PDE Accelerator

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cover image ACM Transactions on Embedded Computing Systems

ACM Transactions on Embedded Computing Systems Volume 22, Issue 2

March 2023

560 pages

ISSN:1539-9087

EISSN:1558-3465

DOI:10.1145/3572826

Editor:
Tulika Mitra
National University of Singapore, Singapore

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Publication History

Published: 24 January 2023

Online AM: 22 June 2022

Accepted: 05 June 2022

Revised: 13 April 2022

Received: 12 October 2021

Published in TECS Volume 22, Issue 2

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