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Sam (Likun) Xi

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Sam (Likun) Xi
GENERAL Software Engineer at Google Inc. 1600 Amphitheatre Parkway Mountain View, CA 94043 Website: www.samxi.org E-mail: xyzsam@google.com RESEARCH INTERESTS Computer architecture, datacenter workloads, performance optimization, machine learning, hardware accelerators, SoC design, power/performance modeling. EDUCATION
Harvard University, Cambridge, MA 02138
S.M., Ph.D., Computer Science, August 2013 - November 2018 Advised by David Brooks and Gu-Yeon Wei
Duke University, Durham, NC 27708
B.S.E, Electrical and Computer Engineering, 2009-2013 B.S., Physics, 2009-2013 · Summa Cum Laude, with Departmental Distinction. Final GPA: 3.937 CONFERENCE PUBLICATIONS Brucek Khailany, Evgeni Krimer, Rangharajan Venkatesan, Jason Clemons, Joel S. Emer, Matthew Fojtik, Alicia Klinefelter, Michael Pellauer, Nathaniel Pinckney, Yakun Sophia Shao, Shree- sha Srinath, Christopher Torng, Sam (Likun) Xi, Yanqing Zhang, and Brian Zimmer. ��A Modular Digital VLSI Flow for High-Productivity SoC Design��, Design Automation Conference, June 2018. Svilen Kanev, Sam (Likun) Xi, Gu-Yeon Wei, and David Brooks. ��Mallacc: Accelerating Memory Allocation��, Proc. International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), April 2017. Best Paper Candidate. Yakun Sophia Shao, Sam (Likun) Xi, Viji Srinivasan, Gu-Yeon Wei, and David Brooks. ��Co-Designing Accelerators and SoC Interfaces Using gem5-Aladdin��, Proc. International Symposium on Microarchitecture (MICRO), October 2016. Sam (Likun) Xi, Oreoluwa Babarinsa, Manos Athanassoulis, and Stratos Idreos. ��Beyond the Wall: Near-Data Processing for Databases��, SIGMOD Workshop on Data Management on New Hardware (DaMoN), June 2015. Sam (Likun) Xi, Hans Jacobson, Pradip Bose, Gu-Yeon Wei, and David Brooks. ��Quantifying Sources of Error in McPAT and Potential Impacts on Architectural Studies��, Proc. International Symposium on High Performance Computer Architecture (HPCA), February 2015. Yakun Sophia Shao, Sam Xi, Viji Srinivasan, Gu-Yeon Wei, and David Brooks. ��Towards Cache-Friendly Hardware Accelerators��, In Sensors and Cloud Architectures Work- shop, High Performance Computer Architecture (HPCA), February 2015. Sam Xi, Marisabel Guevara, Jared Nelson, Patrick Pensabene, and Benjamin C. Lee. ��Understanding the Critical Path in Power State Transition Latencies��, Proc. International Symposium on Low Power Electronics and Design (ISLPED), September 2013. THESES Likun (Sam) Xi. Advancing System-Level Analysis and Design of Specialized Architectures. Ph.D Dissertation. Harvard University, School of Engineering and Applied Sciences, 2018. 1

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NVIDIA Corporation, Architecture Research Group
Research Intern May 2017 to August 2017 · Supervisor: Joel Emer, Steve Keckler · Evaluated the tradeoffs of building flexible machine learning hardware accelerators. · Implemented sparse convolution on a prototype DNN accelerator in synthesizable Sys- temC to evaluate its performance on a new workload. · Implemented various dense convolutional dataflows on this prototype to compare its performance against fixed-function accelerators.
NVIDIA Corporation, ASIC/VLSI Research Group
Research Intern May 2015 to August 2015 · Supervisor: Brucek Khailany · Investigated using high-level synthesis tools to supplant hand-written RTL for hardware prototyping and design in a commercial setting. · Implemented various parameterizable floating-point units in C++ using HLS tools. · Implemented the texture filtering stage from Pascal GPU using HLS and obtained com- parable quality-of-result compared to hand-written RTL. · Implemented synthesizable cache simulator in SystemC for use in rapid prototyping of new hardware designs. AWARDS Harvard University · Gordon McKay Graduate Research Fellowship, 2013. · James Mills Peirce Fellowship, 2013 National Science Foundation · Graduate Research Fellowship, 2013 - 2016. Duke University · Charles Ernest Seager Memorial Award, 2013 · ECE Department, Best Poster Award, 2013. · Top 5% of 2013 Engineering Class. · Dean��s List with Distinction 2009-2013. Honors Societies · Phi Beta Kappa Honors Society. · Sigma Pi Sigma Physics Society. · Tau Beta Pi Engineering Society. SKILLS Programming · Languages: C++, C, Python, Java, SystemC · OS: Experience with the Linux kernel on both x86 and ARM · CAD tools: Catapult HLS, Vivado Design Suite I am the primary maintainer of: · gem5-Aladdin, an SoC simulator
· Aladdin, an accelerator power/performance/area simulator
· LLVM-Tracer, an LLVM optimization pass used by Aladdin

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Dr. David Brooks (dbrooks@eecs.harvard.edu; (617) 495-3989)
· Haley Family Professor of Computer Science · School of Engineering and Applied Sciences, Harvard University.
Dr. Gu-Yeon Wei (guyeon@eecs.harvard.edu; (617) 495-3989)
· Gordon McKay Professor of Electrical Engineering · School of Engineering and Applied Sciences, Harvard University. Dr. Michael Pellauer (mpellauer@nvidia.com) · Senior Research Scientist. · Architecture Research Group, NVIDIA. 3
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