I am a 5th-year Computer Science PhD student at Tsinghua University, advised by Fengyuan Ren.

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 | Ultimate | Unified CCL (UCCL) for GPU communication.

Recent Publications

• UCCL-EP: Portable Expert-Parallel Communication [paper]
  Ziming Mao, Yihan Zhang, Chihan Cui, Kaichao You, Zhongjie Chen, Zhiying Xu, Scott Shenker, Costin Raiciu, Yang Zhou, Ion Stoica
  Arxiv Dec 2025

• Principled Performance Tunability in Operating System Kernels [paper]
  Zhongjie Chen, Wentao Zhang, Yulong Tang, Ran Shu, Fengyuan Ren, Tianyin Xu, Jing Liu
  Arxiv Dec 2025

• An Extensible Software Transport Layer for GPU Networking [paper]
  Yang Zhou*, Zhongjie Chen* (Equal Contribution), Ziming Mao, ChonLam Lao, Shuo Yang, Pravein Govindan Kannan, Jiaqi Gao, Yilong Zhao, Yongji Wu, Kaichao You, Fengyuan Ren, Zhiying Xu, Costin Raiciu, Ion Stoica
  Arxiv April 2025

• 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

• ScalaTap: Scalable Outbound Rate Limiting in Public Cloud
  Zhongjie Chen, Kun Qian; Qingkai Meng, Ran Shu, Xiaoyu Li, Yiran Zhang, Bo Wang, Wei Li, 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, 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