About
I am a senior researcher in the Systems and Networking Research Group at Microsoft Research Asia (MSRA). I received my Ph.D. in June 2026 from the Department of Computer Science and Technology at Tsinghua University, where I was advised by Professor Fengyuan Ren. During my PhD journey, I was also mentored by Yang Zhou (2024-2026) and Jing Liu (2025-2026, MSRA Intern).
My research interests include Machine Learning Systems, Operating Systems, and Networking Stack. I am actively maintaining Ultra | Unified CCL (UCCL).
Recently, I focus on the following research topics:
- Efficient communication library for consumer-level/low-end GPUs.
- Fine-grained compute-communication overlapping for machine learning systems.
- High-performance network for scale-up and scale-out domain.
OPEN SOURCE / ACTIVE MAINTAINER
UCCL
Ultra | Unified CCL
Efficient, portable GPU communication for AI workloads, from collectives and point-to-point transfers to expert parallelism across NVIDIA and AMD GPUs.
Integrated into
Recent Publications
View All →Multi-GPU MoE Inference With Adaptive Expert Offloading
William X. Zheng, Zhongjie Chen, Shuo Yang, Ziming Mao, Xiaoze Fan, Yi Pan, Kunjun Li, Hanfei Yu, Chenfeng Xu, Yang Zhou, Rishabh Iyer, Ion Stoica
Preprint 2026
Arxiv 11/26 [paper]
Rondo: Controlling Reordering in High-Throughput Packet Spraying
Xizhi Zhang, Zhongjie Chen, Yang Zhang, Fengyuan Ren
Preprint 2026
Arxiv 11/26 [paper]
Scale-up Networking Research: the Next Frontier
Andrei Stan, Alex Pantucu, William Zheng, Zhongjie Chen, Ziming Mao, Rishab Iyer, Ion Stoica, Costin Raiciu
HotNets 2026
ACM Workshop on Hot Topics in Networks [paper]
Understanding GPU Scale-Up Domain Contention
William Zheng, Zihan Zhao, Ziming Mao, Jing Liu, Andrei Stan, Haiying Shen, Costin Raiciu, Zhongjie Chen, Rishab Iyer, Ion Stoica
HotNets 2026
ACM Workshop on Hot Topics in Networks [paper]
XKernel: Principled Performance Tunability in Operating System Kernels
Zhongjie Chen, Wentao Zhang, Yulong Tang, Ran Shu, Fengyuan Ren, Tianyin Xu, Jing Liu
OSDI 2026
USENIX Symposium on Operating Systems Design and Implementation [paper]
UCCL: An Extensible Software Transport Layer for GPU Networking
Yang Zhou*, Zhongjie Chen* (Equation Contribution), Ziming Mao, ChonLam Lao, Shuo Yang, Pravein Govindan Kannan, Xizhi Zhang, Jiaqi Gao, Yilong Zhao, Yongji Wu, Kaichao You, Fengyuan Ren, Zhiying Xu, Costin Raiciu, Ion Stoica
OSDI 2026
USENIX Symposium on Operating Systems Design and Implementation [paper]
UCCL-EP: Portable Expert-Parallel Communication
Ziming Mao, Yihan Zhang, Chihan Cui, Zhen Huang, Kaichao You, Zhongjie Chen, Zhiying Xu, Zhenyu Gu, Scott Shenker, Costin Raiciu, Yang Zhou, Ion Stoica
OSDI 2026
USENIX Symposium on Operating Systems Design and Implementation [paper]
eTran: Extensible Kernel Transport with eBPF
Zhongjie Chen, Qingkai Meng, ChonLam Lao, Yifan Liu, Fengyuan Ren, Minlan Yu, Yang Zhou
NSDI 2025
USENIX Symposium on Networked Systems Design and Implementation [paper]
ScalaTap: Scalable Outbound Rate Limiting in Public Cloud
Zhongjie Chen, Yingchen Fan, Kun Qian, Qingkai Meng, Ran Shu, Xiaoyu Li, Yiran Zhang, Bo Wang, Wei Li, Fengyuan Ren
INFOCOM 2025
IEEE International Conference on Computer Communications [paper]
DockRDMA: Hybrid RDMA Virtualization for Containerized Clouds
Xiaoyu Li, Ran Shu, Zhongjie Chen, Xiaohui Luo, Yiran Zhang, Bo wang, Qingkai Meng, Fengyuan Ren
ICNP 2024
IEEE International Conference on Network Protocols [paper]
Predictable Host Networking in Data Centers: Challenges, Techniques and Future Directions
Zhongjie Chen, Qingkai Meng, Yiran Zhang, Ziyang Zheng, Fengyuan Ren
IEEE Network 2024
IEEE Network [paper]
Highlighted Awards
- 2026 Outstanding Doctoral Dissertation of Tsinghua University (清华大学优秀博士学位论文)
- 2026 Outstanding Graduate of Tsinghua University (清华大学优秀毕业生, Top 4%)
- 2026 Outstanding graduates of the Department of Computer Science, Tsinghua University (清华大学计算机系优秀毕业生)
- 2023/2025 Comprehensive Excellence Scholarship of Tsinghua University (清华大学综合优秀奖学金)
- 2017/2019/2020 National Scholarship (国家奖学金)
Work Experience & Education
Work Experience
- 2026.7 - now,
Microsoft Research Asia, senior researcher - 2025.4 - 2026.6, Microsoft Research Asia, research intern
Education Background
- 2021–2026, Tsinghua University, Ph.D. in Computer Science (GPA Rank: 16/121)
- 2017–2021, Lanzhou University, B.S. in Computer Science (GPA Rank: 1/200)