Rachee Singh

I am an assistant professor of Computer Science at Cornell University where I lead the sysphotonics group. The sysphotonics group develops systems and algorithms for efficient communication on server-scale, rack-scale and long-haul photonic interconnects. We use these systems to improve the performance of important applications like distributed machine learning and general planet-scale cloud workloads.

I am also an Amazon Scholar in the SageMaker Hyperpod teams that specialize in large-scale ML infrastructure.

---

News

• 2025.03: Thrilled to receive a Cisco Research Award!
• 2025.01: Our work on efficient preemption of LLM inference queries will appear at ASPLOS 2025!
• 2025.01: SRC and DARPA fund my group as part of the JUMP 2.0 program!
• 2024.12: Atkinson Center for Sustainability funds our work on photonic interconnects!
• 2024.12: Our work on chip-to-chip photonic interconnects will appear at OFC 2025!
• 2024.12: Our work on programmable integrated photonics will appear at OFC 2025!
• 2024.12: Our work on multi-WAN transport got accepted to NSDI 2025!
• 2024.08: Received a $1M grant from the NSF on chip-to-chip photonic fabrics for ML!
• 2024-07: Thrilled to be invited to attend the NSF Ideas Lab on breaking low-latency barriers!
• 2024.05: Thrilled to receive the PCCW Affinito-Stewart Grant from Cornell!
• 2024.03: Thrilled to receive the Amazon Research Award!
• 2023.08: Thrilled to receive the Cisco Research Award!
• 2023.06: Abhishek’s paper on optical slicing got accepted to NSDI 2024!
• 2023.05: Zhiying’s paper got accepted to ACM SIGCOMM 2023!
• 2022.12: OneWAN got accepted to NSDI 2023!
• 2022.07: Aashaka’s paper, TACCL, got accepted to NSDI 2023!

Publications

• • Aqua: Network-Accelerated Memory Offloading for LLMs in Scale-Up GPU Domains
  • Abhishek Vijaya Kumar, Gianni Antichi, Rachee Singh
  • ACM International Conference on Architectural Support for Programming Languages and Operating System (ASPLOS), 2025
• • Chip-to-Chip Photonic Connectivity in Multi-Accelerator Servers for ML
  • Abhishek Vijaya Kumar, Arjun Devraj, Darius Bunandar, Rachee Singh
  • Optical Fiber Communications (OFC), 2025
• • PipSwitch: A Circuit Switch Using Programmable Integrated Photonics
  • Eric Ding, Rachee Singh
  • Optical Fiber Communications (OFC), 2025
• • Efficient multi-WAN transport for 5G with OTTER
  • Mary Hogan, Yiming Qiu, Gerry Wan, Sharad Agarwal, Ryan Beckett, Rachee Singh, Victor Bahl
  • USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2025
• • Mitigating effects of wavelength-specific faults in cloud WANs
  • Arjun Devraj, Bill Owens, Umesh Krishnaswamy, Ying Zhang, Rachee Singh
  • One-shot revision from USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2025
• • A case for server-scale photonic connectivity
  • Abhishek Vijaya Kumar, Arjun Devraj, Darius Bunandar, Rachee Singh
  • Twenty-Third ACM Workshop on Hot Topics in Networks (HotNets), 2024
• • An optical slice of the wide-area network
  • Abhishek Vijaya Kumar, Bill Owens, Nikolaj Bjorner, Binbin Guan, Yawei Yin, Victor Bahl, Rachee Singh
  • USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2024
• • Teal: Learning-Accelerated Optimization of WAN Traffic Engineering
  • Zhiying Xu, Francis Y. Yan, Rachee Singh, Justin T. Chiu, Alexander M. Rush, Minlan Yu
  • ACM Special Interest Group on Data Communications (SIGCOMM), 2023
• • OneWAN is better than two: Unifying a split wide-area network architecture
  • Umesh Krishnaswamy, Rachee Singh, Paul Mattes, Paul-Andre C Bissonette, Nikolaj Bjorner, Zahira Nasrin, Sonal Kothari, Prabhakar Reddy, John Abeln, Srikanth Kandula, Himanshu Raj, Luis Irun-Briz, Jamie Gaudette, Erica Lan
  • USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2023
• • Making Sense of Constellations: Methodology for Understanding Starlink’s Scheduling Algorithms
  • Hammas Bin Tanveer, Mike Puchol, Rachee Singh, Antonio Bianchi, Rishab Nithyanand
  • International Conference on emerging Networking EXperiments and Technologies (ACM CoNEXT), 2023
• • Glowing in the dark: Uncovering IPv6 address discovery and scanning strategies
  • Hammas Bin Tanveer, Rachee Singh, Paul Pearce, Rishab Nithyanand
  • USENIX Security Symposium (USENIX Security), 2023
• • TACCL: Guiding Collective Algorithm Synthesis using Communication Sketches
  • Aashaka Shah, Vijay Chidambaram, Meghan Cowan, Saeed Maleki, Madan Musuvathi, Todd Mytkowicz, Jacob Nelson, Olli Saarikivi, Rachee Singh
  • USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2023
• • Traffic engineering: from ISP to cloud wide-area networks
  • Rachee Singh, Nikolaj Bjorner, Umesh Krishnaswamy
  • ACM SIGCOMM Symposium on SDN Research (SOSR 2022)
• • Decentralized cloud wide-area network traffic engineering with BlastShield
  • Umesh Krishnaswamy, Rachee Singh, Nikolaj Bjorner, Himanshu Raj
  • USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2022
• • Cost-effective capacity provisioning in wide area networks with Shoofly
  • Rachee Singh, Nikolaj Bjorner, Sharon Shoham, Yawei Yin, John Arnold, Jamie Gaudette
  • ACM Special Interest Group on Data Communications (SIGCOMM), 2021
  • Press Coverage:APNIC Blog
• • PredictRoute: A Network Path Prediction Toolkit
  • Rachee Singh, David Tench, Phillipa Gill, Andrew McGregor
  • ACM SIGMETRICS, 2021
• • Surviving switch failures in cloud datacenters
  • Rachee Singh, Muqeet Mukhtar, Ashay Krishna, Aniruddha Parkhi, Jitendra Padhye, David Maltz
  • SIGCOMM Computer Communication Review (CCR), 2021
  • Press Coverage:The Next Platform
• • Cost-effective Cloud Edge Traffic Engineering with Cascara
  • Rachee Singh, Sharad Agarwal, Matt Calder, Victor Bahl
  • USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2021
• • Characterizing the performance and deployment of Multi-CDNs
  • Rachee Singh, Arun Dunna, Phillipa Gill
  • ACM Internet Measurement Conference (IMC), 2018
• • RADWAN: Rate Adaptive Wide Area Network
  • Rachee Singh, Manya Ghobadi, Klaus-Tycho Foerster, Mark Filer, Phillipa Gill
  • ACM Special Interest Group on Data Communications (SIGCOMM), 2018
• • Run, Walk, Crawl: Towards Dynamic Link Capacities
  • Rachee Singh, Manya Ghobadi, Klaus-Tycho Foerster, Mark Filer, Phillipa Gill
  • ACM Hot Topics in Networking (HotNets), 2017
  • Community Dialogue: HotNets Dialogue
  • Press Coverage:Microsoft Research Blog, Datacenter Knowledge
• • Characterizing the Nature and Dynamics of Tor Exit Blocking
  • Rachee Singh, Rishab Nithyanand, Sadia Afroz, Paul Pearce, Michael Carl Tschantz, Phillipa Gill, Vern Paxson
  • USENIX Security Symposium (Security), 2017
• • The Politics of Routing: Investigating the Relationship Between AS Connectivity and Internet Freedom
  • Rachee Singh, Hyungjoon Koo, Najmehalsadat Miramirkhani, Fahimeh Mirhaj, Phillipa Gill, Leman Akoglu
  • USENIX Free and Open Communications on the Internet (FOCI), 2016