2022 Swanson School Summary of Faculty Research

Page 94

ELECTRICAL & COMPUTER ENGINEERING

Jun Yang, PhD

1140 Benedum Hall | 3700 O’Hara Street | Pittsburgh, PA 15261

Professsor Computer Engineering Program

P: 412-624-9088 juy9@pitt.edu

Emerging Non-volatile Memory Technologies Data centers in the U.S. consume well over 100 billion kilowatt hours of energy yearly, according to U.S. Department of Energy. One of the most power hungry parts of data centers has traditionally been the processor. With technology scaling and applications’ growing demand for more memory, the majority of power consumption of data centers is shifting from the processor to main memory. Today’s memory technology cannot keep pace with this change and is reaching its limit in power consumption and density at data-center scales.

This project aims to solve the energy problem posed by memory. Rather than relying solely on DRAM, our approach integrates emerging non-volatile memories, e.g. Phase Change Memory, Spin-Torque-Transfer Magnetic RAM, to construct a high-capacity and energy-efficient memory system. The research is ambitious with fundamental and applied contributions in the design and development of energy-efficient computer servers. The fundamental research includes: a new integrated memory architecture that manages hybrid memory resources; novel techniques for energy, performance, endurance and fault tolerant management; and a new hybrid main memory controller. The applied contributions are our tools that we develop including simulation and analytic models and actual software/emulated hardware system.

Nanophotonic Interconnection Network Electrical on-chip networks are hitting great challenges in power, latency and bandwidth density with technology scaling. Such challenges are especially pronounced in the era of multi-core computing where high bandwidth, low power, and low-latency global transmission are required. For those reasons, and recent breakthroughs in nanophotonic devices, optical interconnection is again considered as a potential on-chip network for future

many-core microprocessors. However, there are still fundamental limitations in nanophotonic networks that hinder their success in competing with their electrical counterpart. This project aims at future optical Networks-on-Chip, and target the bandwidth, performance, power/energy, and reliability, all being fundamental problem of on-chip optics. We use complementary solutions, joining devicelevel innovations, architectural novelties

and operating system originalities into a systematic framework. The objective is to make on-chip nanophotonics a more practical and applicable technology for future many-core microporcessors.

Power and Thermal Management for Future Microprocessors Many mobile embedded systems are designed to be small and compact to favor portability. As the user demand expands for more powerful, versatile, and integrated solutions, the designers endeavor to pack more and more devices into the small embedded form factors thanks to the technology advancement. In parallel with this trend, the microprocessor technology has evolved into an era of integrating multiple cores in one die, a.k.a. chip multiprocessor or CMP, to support concurrent execution of multiple applications. The recent promotion of the 3D stacking technology (stack multiple die vertically) further enables smaller chip

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footprints and packaging at a higher transistor density. As can be foreseen, the marriage of the future embedded systems and future microprocessors brings forth concerns in increased power density which renders the thermal management a key challenge for embedded processors. This project recognizes the incessant power and thermal challenges and the limitations of the current approaches, and promotes a new suite of solutions at a higher level that address the drawbacks of existing solutions. It is important to raise the power and thermal awareness to a high level, such as the embedded operating system, where application thermal behavior are more

explicit. The proposed techniques leverage the natural discrepancies in the power and thermal behavior among different application threads, and allocate, migrate, or schedule them among different cores. The goal is to minimize power consumption and thermal violations through proactive thread management at a high level.

DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING


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Xiayun (Sharon) Zhao, PhD

37min
pages 133-154

Jörg M.K. Wiezorek, PhD

2min
page 131

Wei Xiong, PhD, D.Eng

1min
page 132

Guofeng Wang, PhD

2min
page 130

Jeffrey Vipperman, PhD

2min
page 129

Albert C. To, PhD

1min
page 128

Patrick Smolinski, PhD

1min
page 127

Inanc Senocak, PhD

1min
page 126

David Schmidt, PhD

2min
page 125

Ian Nettleship, PhD

2min
page 124

Scott X. Mao, PhD

2min
page 123

Jung-Kun Lee, PhD

3min
page 122

Tevis D. B. Jacobs, PhD

1min
page 121

William W. Clark, PhD

2min
page 118

Daniel G. Cole, PhD, PE

2min
page 119

Katherine Hornbostel, PhD

1min
page 120

Minking K. Chyu, PhD

2min
page 117

Heng Ban, PhD, PE

2min
page 115

Hessam Babaee, PhD

2min
page 114

Michael D. Sherwin, PhD, P.E

2min
pages 111-113

Markus Chmielus, PhD

1min
page 116

M. Ravi Shankar, PhD

2min
page 110

Amin Rahimian, PhD

1min
page 108

Jayant Rajgopal, PhD, P.E

2min
page 109

Lisa M. Maillart, PhD

2min
page 107

Paul W. Leu, PhD

1min
page 106

Daniel R. Jiang, PhD

1min
page 105

Oliver Hinder, PhD

2min
page 104

Joel M. Haight, PhD, P.E., CIH, CSP

2min
page 103

Renee M. Clark, PhD

2min
page 102

Karen M. Bursic, PhD

1min
page 100

Youngjae Chun, PhD

3min
page 101

Mary Besterfield-Sacre, PhD

2min
page 99

Minhee Yun, PhD

2min
pages 96-97

Mostafa Bedewy, PhD

1min
page 98

Nathan Youngblood, PhD

2min
page 95

Jun Yang, PhD

3min
page 94

Gregory F. Reed, PhD

3min
page 91

Feng Xiong, PhD

2min
page 93

Inhee Lee, PhD

2min
page 88

Guangyong Li, PhD

2min
page 89

Alexis Kwasinski, PhD

2min
page 87

Hong Koo Kim, PhD

2min
page 86

Alex K. Jones, PhD

3min
page 85

Brandon M. Grainger, PhD

2min
page 83

Alan D. George, PhD, FIEEE

2min
page 82

Masoud Barati, PhD

2min
page 81

Mai Abdelhakim, PhD

1min
page 80

Meng Wang, PhD

1min
pages 78-79

Radisav Vidic, PhD

2min
page 77

Julie M. Vandenbossche, PhD, PE

2min
page 76

Aleksandar Stevanovic, PhD, P.E., FASCE

2min
page 75

Piervincenzo Rizzo, PhD

2min
page 74

Xu Liang, PhD

2min
page 71

Jeen-Shang Lin, PhD, P.E

2min
page 72

Carla Ng, PhD

2min
page 73

Sarah Haig, PhD

2min
page 69

Lei Fang, PhD

3min
page 66

Andrew P. Bunger, PhD

2min
page 65

Alessandro Fascetti, PhD

2min
page 67

Melissa Bilec, PhD

2min
page 64

Judith C. Yang, PhD

2min
pages 61-63

Götz Veser, PhD

2min
page 59

Christopher E. Wilmer, PhD

1min
page 60

Sachin S. Velankar, PhD

2min
page 58

Tagbo Niepa, PhD

2min
page 55

Jason E. Shoemaker, PhD

1min
page 57

Giannis Mpourmpakis, PhD

2min
page 54

Badie Morsi, PhD

3min
page 53

James R. McKone, PhD

1min
page 52

Lei Li, PhD

1min
page 50

Steve R. Little, PhD

2min
page 51

John A. Keith, PhD

2min
page 49

J. Karl Johnson, PhD

2min
page 48

Susan Fullerton, PhD

2min
page 47

Robert M. Enick, PhD

2min
page 46

Eric J. Beckman, PhD

2min
page 45

Ipsita Banerjee, PhD

2min
page 44

Ioannis Zervantonakis, PhD

2min
pages 41-43

Savio L-Y. Woo, PhD, D.Sc., D.Eng

2min
page 40

Justin S. Weinbaum, PhD

1min
page 39

Jonathan Vande Geest, PhD

1min
page 37

David A. Vorp, PhD

2min
page 38

Sanjeev G. Shroff, PhD

2min
page 34

Gelsy Torres-Oviedo, PhD

3min
page 36

George Stetten, MD, PhD

2min
page 35

Joseph Thomas Samosky, PhD

2min
page 33

Warren C. Ruder, PhD

1min
page 32

Partha Roy, PhD

2min
page 31

Prashant N. Kumta, PhD

2min
page 27

Spandan Maiti, PhD

2min
page 29

Mark Redfern, PhD

2min
page 30

Patrick J. Loughlin, PhD

2min
page 28

Mangesh Kulkarni, PhD

1min
page 26

Takashi “TK” Kozai, PhD

2min
page 25

Katrina M. Knight, PhD

2min
page 24

Bistra Iordanova, PhD

1min
page 23

Alan D. Hirschman, PhD

1min
page 21

Mark Gartner, PhD

1min
page 20

William Federspiel, PhD

2min
page 18

Neeraj J. Gandhi, PhD

2min
page 19

Tamer S. Ibrahim, PhD

5min
page 22

Richard E. Debski, PhD

1min
page 17

Lance A. Davidson, PhD

2min
page 16

Rakié Cham, PhD

2min
page 13

Steven Abramowitch, PhD

2min
page 8

Moni Kanchan Datta, PhD

2min
page 15

Bryan N. Brown, PhD

1min
page 12

Kurt E. Beschorner, PhD

2min
page 10

Harvey Borovetz, PhD

1min
page 11

Aaron Batista, PhD

4min
page 9

Tracy Cui, PhD

2min
page 14
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