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
- 2026.08: Lambda-Lambda wins the best paper award at ACM SIGCOMM 2026!
- 2026.06: Excited to receive a Jane Street Research Award!
- 2026.06: Excited to receive a LinkedIn Faculty Research Award!
- 2026.04: Excited to receive a Google Research Award!
- 2026.04: Excited to be a part of the Moonshot cohort funded by Laude Institute!
- 2026.03: Arjun’s work on in-network analog computing won the outstanding paper award at OFC!
- 2025.07: Awarded an NSF grant to achieve efficient collective communication in the cloud!
- 2025.03: Thrilled to receive a Cisco Research Award!
- 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!
- 2024.08: Received a $1M grant from the NSF on chip-to-chip photonic fabrics for ML!
Publications
-
- Autonomy Without Anarchy in Decentralized WAN Traffic Engineering
- Arjun Devraj, Umesh Krishnaswamy, Ying Zhang, Karuna Grewal, Justin Hsu, Eva Tardos, Rachee Singh
- USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2027
-
- Mo Collectives Mo Problems
- Abhishek Vijaya Kumar, Arjun Devraj, Rachee Singh
- USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2027
-
- Breaking Temporal Symmetry in Collective Communication Algorithms
- Arjun Devraj, Rachee Singh
- Twenty-Fifth ACM Workshop on Hot Topics in Networks (HotNets), 2026
-
- The Case for Automated Probabilistic Reasoning for Network Performance Analysis
- Jamie Kai, Rachee Singh, Mina Tahmasbi Arashloo
- Twenty-Fifth ACM Workshop on Hot Topics in Networks (HotNets), 2026
-
- The ACE Center for Evolvable Computing
- Josep Torrellas, Minlan Yu, José F. Martínez, Radu Teodorescu, Zhiru Zhang, Zhengya Zhang, Tarek Abdelzaher, Mohammad Alian, Adam Belay, Rajesh Gupta, Tushar Krishna, Arvind Krishnamurthy, Christos Kozyrakis, Charith Mendis, Subhasish Mitra, Muhammad Shahbaz, Rachee Singh, Steven Swanson, Michael Taylor, Mohit Tiwari, Mengjia Yan
- IEEE Micro, Special Issue on SRC JUMP 2.0 Centers, 2026
-
- Photonic Rails in ML Datacenters
- Eric Ding, Barry Lyu, Bhaskar Kataria, Rachee Singh
- ACM Special Interest Group on Data Communications (SIGCOMM), 2026
-
- λλ: a programming language for silicon photonics
- Vaibhav Mehta, Arjun Devraj, Bill Owens, Justin Hsu, Rachee Singh
- ACM Special Interest Group on Data Communications (SIGCOMM), 2026
- Winner of the Best Paper Award!
-
- TVCache: A Tool-Value Cache for Post-Training LLM Agents
- Abhishek Vijaya Kumar, Bhaskar Kataria, Byungsoo Oh, Emaad Manzoor, Rachee Singh
- Forty-Third International Conference on Machine Learning (ICML), 2026
-
- Reconfigurable Torus Fabrics for Multi-tenant ML
- Abhishek Vijaya Kumar, Eric Ding, Arjun Devraj, Darius Bunandar, Rachee Singh
- ACM International Conference on Architectural Support for Programming Languages and Operating System (ASPLOS), 2026
-
- In-Network Analog AllReduce for ML with Programmable Integrated Photonics
- Arjun Devraj, Bill Owens, Daniel Perez Lopez, Rachee Singh
- Optical Fiber Communications (OFC), 2026 (Oral and top scored paper)
- Winner of the Corning Outstanding Paper Award!
-
- What Obstructed Skies Teach Us about Satellite Internet
- Bhaskar Kataria, Hammas Bin Tanveer, Rishab Nithyanand, Rachee Singh
- New Ideas in Networked Systems (NINES 2026)
-
- HEDGE: Traffic Engineering with Probabilistic Link Capacities
- Arjun Devraj, Bill Owens, Umesh Krishnaswamy, Ying Zhang, Rachee Singh
- USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2026
-
- Learning to Tune Optical WANs: A Field Deployment of Noise Models in Optical Networks
- Bhaskar Kataria, Howard Hua, Bill Owens, Andrea D’Amico, Rachee Singh
- USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2026
-
- FlashMoE: Fast Distributed MoE in a Single Kernel
- Jonathan Aimuyo, Byungsoo Oh, Rachee Singh
- Conference on Neural Information Processing Systems (NeurIPS), 2025 (main track)
-
- Photonic Rails in ML Datacenters
- Eric Ding, Chuhan Ouyang, Rachee Singh
- Twenty-Fourth ACM Workshop on Hot Topics in Networks (HotNets), 2025
-
- Software Managed Networks via Coarsening
- Pradeep Dogga, Rachee Singh, Suman Nath, Ravi Netravali, Jens Palsberg, George Varghese
- Twenty-Fourth ACM Workshop on Hot Topics in Networks (HotNets), 2025
-
- The Reality of Chasing Shannon’s Limit in Optical Wide-Area Networks
- Arjun Devraj, Bill Owens, Rachee Singh
- ACM Internet Measurement Conferenc (IMC), 2025
-
- 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 (Oral)
-
- 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
-
- 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