Abhishek Vijaya Kumar

Abhishek Vijaya Kumar

PhD Candidate, Computer Science
I am a Ph.D. candidate in Computer Science at Cornell University, where I am fortunate to be advised by Rachee Singh. I work on infrastructure and systems for Machine learning in general. My work has been on communication optimization for distributed machine learning. My work covers both electrical interconnects like Nvlinks and emerging silicon photonics interconnects like this. More recently, I am working on reducing overheads of calling external tools during RL post-training and agentic inference.
I was supported by the Bowers CIS-LinkedIn grant for the academic year 2024-2025. Before Cornell, I spent two amazing years in the Systems group at Microsoft Research India, advised by Muthian Sivathanu and Saikat Guha. I received my undergraduate degree from PES University, Bengaluru.
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Last updated: January 2026

Publications

Morphlux: Transforming Torus Fabrics for Efficient Multi-tenant ML

Abhishek Vijaya Kumar, Eric Ding, Arjun Devraj, Darius Bunandar, Rachee SinghASPLOS 2026
Paper

Aqua: Network-Accelerated Memory Offloading for LLMs in Scale-Up GPU Domains

Abhishek Vijaya Kumar, Gianni Antichi, Rachee SinghASPLOS 2025
Paper BibTeX

Chip-to-chip photonic connectivity in multi-accelerator servers for ML

Abhishek Vijaya Kumar, Arjun Devraj, Darius Bunandar, Rachee SinghOFC 2025
Paper BibTeX

A case for server-scale photonic connectivity

Abhishek Vijaya Kumar, Arjun Devraj, Darius Bunandar, Rachee SinghHotNets 2024
Paper BibTeX

Chisel: An optical slice of the wide-area network

Abhishek Vijaya Kumar, Bill Owens, Nikolaj Bjoner, Binbin Guan, Yawei Yin, Victor Bahl, Rachee SinghNSDI 2024
Paper BibTeX

Quiver: An Informed Storage Cache for Deep Learning

Abhishek Vijaya Kumar, Muthian SivathanuFAST 2020
Paper BibTeX

Efficient AllReduce with StragglersPREPRINT

Arjun Devraj, Eric Ding, Abhishek Vijaya Kumar, Robert Kleinberg, Rachee SingharXiv 2025
arXiv

PCCL: Photonic Circuit-Switched Collective Communication for Distributed MLPREPRINT

Abhishek Vijaya Kumar, Arjun Devraj, Rachee SingharXiv 2025
arXiv

Contact

Please feel free to contact me or drop by my office if you are at Cornell.
Email: abhishek [at] cs [dot] cornell [dot] edu
Office: 456, New Bowers CIS building, Hoy Road, Ithaca, NY, 14853 📍
Miscellaneous: In my free time, I like to run 5Ks on this track, eat chaat with friends and play RPG games on PS5. My personal favorite is Dragon Ball Z sparking zero.