CAREER: Energy-Efficient and Energy-Proportional Silicon-Photonic Manycore Architectures

 

Funding Agency: National Science Foundation

Directorate: Computer & Information Science & Engineering (CISE)

Division: Computer and Communication Foundations (CCF)

Program: Software and Hardware Foundations (SHF)

Award Numbers: 1453853

Program Manager: Sankar Basu

PIs: Nikos Hardavellas (Northwestern University)

Institutions: Department of Electrical Engineering and Computer Science, Northwestern University

Affiliated Graduate Students: Ali Murat Gok, Haiyang (Drake) Han

Project Dates: May 1, 2015 to April 30, 2020

 

Abstract:

Increasing energy demands have put computing on an unsustainable technological, economic and environmental path. Unfortunately, a large fraction of this energy is wasted, with data transfers being one of the major contributors to energy consumption. At the same time, while the demand for computing grows, modern microprocessors are increasingly constrained by physical limitations, which prevent them from realizing their full potential. Area, power, thermal, off-chip bandwidth, and yield limitations constrain single-chip designs to a relatively small number of cores, beyond which scaling becomes impractical. Multi-chip designs can overcome these limitations, but require a cross-chip interconnect with bandwidth, latency, and energy efficiency characteristics well beyond the reach of conventional electrical signaling. The introduction of nano-photonic interconnects, as undertaken in this proposal, can meet these requirements and allow systems to break free of the limitations of single-chip designs.

Within the context of this research, a rigorous educational plan is also integrated into the research agenda that strongly connects research to education, and enhances the participation of minorities and undergraduates in research. This project capitalizes on existing collaborations with the Searle Center for Teaching Excellence at Northwestern University to implement innovative educational approaches, Northwestern's Science in Society outreach initiatives for the general public, and Northwestern's Office of STEM Education Partnerships to develop K-12 STEM outreach activities with outreach potential extending to 140+ schools in the Chicago metropolitan area, reaching 368 teachers and 30,000 students.

Specific technical aspects of this research aims to develop scalable, energy-efficient, and energy-proportional interconnects for future multicores. To achieve this vision, the research seeks to understand and mitigate the energy inefficiencies of the dominant power consumers in silicon-photonics. The project involves a cross-cutting approach to combine developments in novel materials, emerging devices, and 3D-stacking with research in architectural and micro-architectural techniques, memory systems, the runtime environment, and the operating system, to develop adaptive techniques that minimize the energy consumed by nano-photonic interconnects without sacrificing their performance. The overall effort culminates on the design of a virtual macro-chip, a disaggregated many-core design supported by a silicon-photonic interconnect that reaches scales of thousands of cores, at a performance and power level impossible to realize with conventional technology.

 

Project Page: http://www.eecs.northwestern.edu/~hardav/projects/energy_proportional_photonics/

 

Journals and Juried Conference Papers:

1.     Y. Demir and N. Hardavellas. SLaC: Stage Laser Control for a Flattened Butterfly Network. In Proceedings of the 22nd IEEE International Symposium on High Performance Computer Architecture (HPCA), Barcelona, Spain, March 2016

2.     G. Tziantzioulis, A. M. Gok, S M Faisal, N. Hardavellas, S. Ogrenci-Memik, and S. Parthasarathy. Lazy Pipelines: Enhancing Quality in Approximate Computing. In Proceedings of the Design, Automation, and Test in Europe (DATE), Dresden, Germany, March 2016

3.     Y. Demir and N. Hardavellas. Towards Energy-Proportional Optical Interconnects. In Proceedings of the 2nd International Workshop on Optical/Photonic Interconnects for Computing Systems (OPTICS), Dresden, Germany, March 2016 (Invited Paper)

4.     S M Faisal, G. Tziantzioulis, A. M. Gok, S. Parthasarathy, N. Hardavellas, and S. Ogrenci-Memik. Edge Importance Identification for Energy Efficient Graph Processing. In Proceedings of the 2015 IEEE International Conference on Big Data (IEEE BigData), Santa Clara, CA, October 2015

5.     B. Patel, G. Memik and N. Hardavellas. SCP: Synergistic Cache Compression and Prefetching. In Proceedings of the 33rd IEEE International Conference on Computer Design (ICCD), New York City, NY, October 2015

6.     Y. Demir and N. Hardavellas. Parka: Thermally Insulated Nanophotonic Interconnects. In Proceedings of the 9th International Symposium on Networks-on-Chip (NOCS), Vancouver, Canada, September 2015

7.     Y. Demir and N. Hardavellas. Towards Energy-Efficient Photonic Interconnects. In Proceedings of SPIE, Optical Interconnects XV, San Francisco, CA, February 2015. Also selected to appear in SPIE Green Photonics (published prior to this award)

8.     Y. Demir and N. Hardavellas. LaC: Integrating Laser Control in a Photonic Interconnect. In Proceedings of the IEEE Photonics Conference (IPC), pp. 28–29, La Jolla, CA, October 2014 (published prior to this award)

9.     Y. Demir and N. Hardavellas. EcoLaser: An Adaptive Laser Control for Energy-Efficient On-Chip Photonic Interconnects. In Proceedings of the International Symposium on Low Power Electronics and Design (ISLPED), pp. 3–8, La Jolla, CA, August 2014 (published prior to this award)

10.  Y. Demir, Y. Pan, S. Song, N. Hardavellas, G. Memik and J. Kim. Galaxy: A High-Performance Energy-Efficient Multi-Chip Architecture Using Photonic Interconnects. In Proceedings of the ACM International Conference on Supercomputing (ICS), pp. 303–312, Munich, Germany, June 2014 (published prior to this award)

 

Other Conference Presentations / Papers:

11.  Haiyang Han, Yigit Demir, Nikos Hardavellas, Fabian Bustamante and Srikanth Kandula. Energy-Proportional Photonic Networks with Stage Laser Control. 5th Greater Chicago Area Systems Research Workshop (GCASR), Chicago, IL, April 2016

12.  Georgios Tziantzioulis, Ali Murat Gok, S M Faisal, Nikos Hardavellas, Seda Ogrenci-Memik and Srinivasan Parthasarathy. Lazy Pipelines: Enhancing Quality in Approximate Computing. 5th Greater Chicago Area Systems Research Workshop (GCASR), Chicago, IL, April 2016

13.  Yigit Demir, Nikos Hardavellas. Towards Energy Proportional Nanophotonic Interconnects. 4th Greater Chicago Area Systems Research Workshop (GCASR), Chicago, IL, April 2015

14.  Y. Demir and N. Hardavellas. EcoLaser: An Adaptive Laser Control for Energy Efficient On-Chip Photonic Interconnects. 3rd Greater Chicago Area Systems Research Workshop (GCASR), Chicago, IL, April 2014 (published prior to this award)

15.  Y. Demir, Y. Pan, S. Song, N. Hardavellas, G. Memik and J. Kim. Galaxy: A High-Performance Energy-Efficient Multi-Chip Architecture Using Photonic Interconnects. 3rd Greater Chicago Area Systems Research Workshop (GCASR), Chicago, IL, April 2014 (published prior to this award)

16.  Y. Demir and N. Hardavellas. Galaxy: Pushing the Power and Bandwidth Walls with Optically Connected Disintegrated Processors. 2nd Greater Chicago Area Systems Research Workshop (GCASR), Evanston, IL, April 2013 (published prior to this award)

17.  Y. Pan, Y. Demir, N. Hardavellas, J. Kim, and G. Memik. Exploring Benefits and Designs of Optically-Connected Disintegrated Processor Architecture. Workshop on the Interaction between Nanophotonic Devices and Systems (WINDS), co-located with the 43rd International Symposium on Microarchitecture (MICRO), Atlanta, GA, 2010 (published prior to this award)

 

Other Publications:

18.  Y. Demir and N. Hardavellas. LaC: Integrating Laser Control in a Photonic Interconnect. Technical Report NU-EECS-14-03, Northwestern University, Evanston, IL, April 2014 (published prior to this award)

19.  Y. Demir and N. Hardavellas. EcoLaser: An Adaptive Laser Control for Energy Efficient On-Chip Photonic Interconnects. Technical Report NU-EECS-14-02, Northwestern University, Evanston, IL, April 2014 (published prior to this award)

20.  Y. Demir, Y. Pan, S. Song, N. Hardavellas, J. Kim, and G. Memik. Galaxy: A High-Performance Energy-Efficient Multi-Chip Architecture Using Photonic Interconnects. Technical Report NU-EECS-13-08, Northwestern University, Evanston, IL, July 2013 (published prior to this award)

 

 

Disclaimer: This material is based upon work supported by the National Science Foundation under Grant Number CCF-1218768 and CCF-1217353. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.