I am a 5th-year Computer Science PhD student at Tsinghua University, advised by Professor Fengyuan Ren. I will soon join Microsoft Research Asia (MSRA) as a senior researcher in the System Research Group.

During my pursuit of my PhD, I was also mentored by Yang Zhou (2024-present) and Jing Liu (2025-present, MSRA Intern).

My research interests include Machine Learning Systems, Operating Systems, and Networking Stack. I am actively maintaining Ultra | Unified CCL (UCCL) for GPU communication.

Recent Publications

• XKernel: Principled Performance Tunability in Operating System Kernels
  Zhongjie Chen, Wentao Zhang, Yulong Tang, Ran Shu, Fengyuan Ren, Tianyin Xu, and Jing Liu
  OSDI 2026. USENIX Symposium on Operating Systems Design and Implementation

• UCCL: An Extensible Software Transport Layer for GPU Networking
  Yang Zhou*, Zhongjie Chen* (Equal 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, and Ion Stoica
  OSDI 2026. USENIX Symposium on Operating Systems Design and Implementation

• 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, and Ion Stoica
  OSDI 2026. USENIX Symposium on Operating Systems Design and Implementation

• eTran: Extensible Kernel Transport with eBPF
  Zhongjie Chen, Qingkai Meng, ChonLam Lao, Yifan Liu, Fengyuan Ren, Minlan Yu, and Yang Zhou
  NSDI 2025. USENIX Symposium on Networked Systems Design and Implementation

• 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, and Fengyuan Ren
  INFOCOM 2025. IEEE International Conference on Computer Communications

• DockRDMA: Hybrid RDMA Virtualization for Containerized Clouds
  Xiaoyu Li, Ran Shu, Zhongjie Chen, Xiaohui Luo, Yiran Zhang, Bo wang, Qingkai Meng, and Fengyuan Ren
  ICNP 2024. IEEE International Conference on Network Protocols

• Predictable Host Networking in Data Centers: Challenges, Techniques and Future Directions
  Zhongjie Chen, Qingkai Meng, Yiran Zhang, Ziyang Zheng, and Fengyuan Ren
  Network 2024. IEEE Network