Daniele De Sensi

Assitant Professor, Sapienza University of Rome

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I am an Associate Professor at Sapienza University of Rome. I was previously an Assistant Professor at Sapienza University of Rome, and a PostDoc researcher at ETH Zürich and University of Pisa. I received the Ph.D. in Computer Science from the University of Pisa.

My main reseach interests lie on the fields of Interconnection Networks, High Performance Computing, Green Computing, and Parallel Programming. You can find more about my research by checking the publications page.

If you have anything to discuss, feel free to send me an e-mail.

News

Oct 15, 2025 🎉 I’m happy to announce that two papers have been accepted at SC 2025 (Bine Trees: Enhancing Collective Operations by Optimizing Communication Locality and Uno: A One-Stop Solution for Inter- and Intra-Data Center Congestion Control and Reliable Connectivity) and one at EuroSys 2026 (REPS: Recycled Entropy Packet Spraying for Adaptive Load Balancing and Failure Mitigation). I am going to present the paper on Bine Trees in a few weeks at SC 2025. The paper introduces new algorithms for collective operations, reducing distance between communicating ranks and improving performance up to 80% on LUMI and MareNostrum5, 50% on Leonardo, and up to 5x on Fugaku.
Aug 27, 2024 🎉 I’m happy to announce that the paper Exploring GPU-to-GPU Communication: Insights into Supercomputer Interconnects have been accepted at SC ‘24. The paper focuses on GPU-GPU interconnect. We analyzed three top-10 supercomputers, on up to 4k NVIDIA and AMD GPUs, offering valuable insights to architects, researchers, practitioners, and developers. The paper is the outcome of a fruitful collaboration with NVIDIA, Cray HPE, ETH Zurich, CINECA, University of Trento, Vrije Universitiet, and University of Antwerp. You can find a preprint here.
May 2, 2024 🎉 I’m happy to announce that the paper OSMOSIS: Enabling Multi-Tenancy in Datacenter SmartNICs have been accepted at USENIX ATC ‘24. OSMOSIS is a resource manager for SmartNICs to support multi-tenancy with low overhead.
Apr 4, 2024 🎉 I’m happy to announce that a new paper have been accepted at HPDC ‘24. The paper introduces a performance model and new algorithms for reduce and allreduce on the Cerebras Wafer-Scale Engine (WSE), a novel architecture optimized for machine learning workloads. The new algorithms outperform the current vendor solutions by more than 3x.
Feb 15, 2024 👨‍🏫 In partnership with the University of Trento and CINI, we will host in June a summer school focused on High-Performance Computing (HPC) (https://hpc-summer-school-24.disi.unitn.it/). I’ll be giving two lectures on interconnection networks and the process of writing HPC papers. If you’re interested, feel free to join.

Selected Publications

2025

  1. Bine Trees: Enhancing Collective Operations by Optimizing Communication Locality
    Daniele De Sensi, Saverio Pasqualoni, Lorenzo Piarulli, and 5 more authors
    In Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC’25), Nov 2025

2024

  1. HammingMesh: A Network Topology for Large-Scale Deep Learning
    Torsten Hoefler, Tommaso Bonato, Daniele De Sensi, and 6 more authors
    Communications of the ACM, Nov 2024
    Online First
  2. Swing: Short-cutting Rings for Higher Bandwidth Allreduce
    Daniele De Sensi, Tommaso Bonato, David Saam, and 1 more author
    In 21th USENIX Symposium on Networked Systems Design and Implementation (NSDI 24), Apr 2024

2022

  1. Noise in the Clouds: Influence of Network Performance Variability on Application Scalability
    Daniele De Sensi, Tiziano De Matteis, Konstantin Taranov, and 3 more authors
    Proc. ACM Meas. Anal. Comput. Syst., Dec 2022

2021

  1. Flare: Flexible in-Network Allreduce
    Daniele De Sensi, Salvatore Di Girolamo, Saleh Ashkboos, and 2 more authors
    In Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, Dec 2021

2020

  1. An In-Depth Analysis of the Slingshot Interconnect
    Daniele De Sensi, Salvatore Di Girolamo, Kim H. McMahon, and 2 more authors
    In Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, Dec 2020

2019

  1. Mitigating Network Noise on Dragonfly Networks Through Application-aware Routing
    Daniele De Sensi, Salvatore Di Girolamo, and Torsten Hoefler
    In Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, Dec 2019