Guangba Yu.

Postdoctoral ResearcherThe Chinese University of Hong Kong

I’m Guangba Yu. My research focuses on the reliability and optimization of cloud and AI systems.

guangbayu@cuhk.edu.hk Scholar ↗GitHub ↗LinkedIn ↗ORCID ↗

Guangba Yu standing in front of mountains

About me

Since July 2024, I have been a postdoctoral researcher at ARISE, The Chinese University of Hong Kong, mentored by Prof. Michael R. Lyu. My journey in tech was forged at Sun Yat-sen University, where I earned my Ph.D. and M.Eng under the guidance of Prof. Pengfei Chen. From 2022 to 2023, I was a research intern at Tencent’s WeChat Group through the CCF–Tencent Rhino-Bird Elite Program.

My path began not with code, but with traditional Chinese medicine. I started my academic career at Guangzhou University of Chinese Medicine, often called the "MIT of Traditional Chinese Medicine", with the dream of becoming a physician who diagnosed the "bugs" of human body. Today, I've channeled that diagnostic spirit from human systems to software systems, dedicating myself to identifying and healing the faults that affect software reliability and keeping our digital world healthy.

😃 Passionate about prescribing solutions for system reliability. If you're interested in building more robust software, let's connect!

News

May 7, 2026🏆 Our paper PreServe received the ACM SIGSOFT Distinguished Paper Award at ICSE 2026. CUHK announcement ↗

Nov 26, 2025🏆 Our paper iKnow received the ACM SIGSOFT Distinguished Paper Award at ASE 2025. CUHK announcement ↗

Aug 14, 2025🎉 Our Alert Management and Cloud Ops RAG Paper has been accepted by ASE'25.

Earlier news

Jul 18, 2025🎉 Our Network Telemetry RCA Paper has been accepted by ToN. Congras to Hongyang!

Jul 14, 2025🎉 Our Cloud Incident Management Paper has been accepted by TSE. Congras to Zilong!

Mar 26, 2025🎉 Our Survey on Failure Analysis and Fault Injection in AI Systems has been accepted by TOSEM.

Mar 26, 2025🎉 Log-based LLM training failures diagnosis framework L4 has been accepted by FSE'25. Congras to Zhihan!

Jan 20, 2025🎉 Code knowledge enhanced root cause analysis framework CoCA has been accepted by ICSE'25. Congras to Yichen!

Oct 30, 2024🎉 Microservice Trace Framework Mint has been accepted by ASPLOS'25. Congras to Haiyu!

Aug 7, 2024🎉 FaaS configuration optimization Paper FaaSConf has been accepted by ASE'24 (118/587). Congras to Yilun!

Jul 18, 2024🏆 Trace sampling paper TraStrainer has won Best Paper Award at FSE'24.

Feb 23, 2024🎉 Request-level fault injection paper MicroFI has been accepted by TDSC. Congras to Hongyang!

Jan 22, 2024🎉 Root cause change analysis paper ChangeRCA and trace sampling paper TraStrainer have been accepted by FSE'24 (56/483).

Jul 28, 2023🎉 Multi-modal observability data RCA paper Nezha and database configuration optimization paper Diagconfig has been accepted by FSE'23.

Recent updates

Paper DigestAll digests

Oct 26, 20262 papers

Admission Rules for Self-Improvement and Numerical Repairs for Training Gradients

Two close readings: verifier strength and recoverability as conditions for agent self-improvement, and repairs for gradient errors hidden by rounding in softmax and cross-entropy.

Read note

Tech NotesAll tech notes

Oct 25, 2026

vLLM at Rack Scale: CPU Costs After Wide Expert Parallelism

Disaggregated serving, expert balancing, and host overhead for V4.1-Flash, with distinct throughput and comparison conditions.

Oct 25, 2026

SGLang and DeepInfer: Bounded Replay and a Complete Serving Stack

Kernel fusion, Engram placement, and cache restoration, with conditions behind up to 1.04× prefill and 7.4% shorter decode steps.

What I work on

Research areas

Publications ↗

Two research areas, supported by chaos engineering.

Education

2020.09–2024.07

Sun Yat-sen University

Ph.D. in Computer Science and Technology

Advisor: Prof. Pengfei Chen

2018.09–2020.07

Sun Yat-sen University

M.Eng. in Computer Technology

Advisor: Prof. Pengfei Chen

2014.09–2018.07

Guangzhou University of Chinese Medicine

B.Eng. in Medical Information Engineering

Advisor: Prof. Xiufeng Liu

Honors & awards

2026ACM SIGSOFT Distinguished Paper Award, ICSE 2026 (PreServe)
2025First Prize, Science & Technology Innovation Award, Guangdong Association for Promotion of S&T Achievement Transformation
2025Third Prize, Science & Technology Progress Award, Chinese Institute of Electronics
2025ACM SIGSOFT Distinguished Paper Award, ASE 2025 (iKnow)
2025APSEC 2025 Distinguished Reviewer Award
2024ACM China (Zhuhai) Doctoral Dissertation Award
2024ACM SIGSOFT Distinguished Paper Award, FSE 2024 (TraStrainer)
2024Best Cloud Computing Application Award, IEEE–CCF (LogReducer)
2024Outstanding Graduate, Sun Yat-sen University
2023National Scholarship, Ministry of Education of China
2022–2023CCF–Tencent Rhino-Bird Elite Talent Program & Special Scholarship

Academic service

Program Committee: FSE 2027; FSE 2026 (IVR); ICSME 2026 (TDDS & VER); APSEC 2025; EuroSys 2025 (Shadow)
Artifact Evaluation: OSDI 2022; USENIX ATC 2022
Reviewer: TSE, TOSEM, TSC, TPDS, TC, TMC, KDD 2026, WWW 2024, PR, EAAI, TCC, JSEP, JSS, EMSE, Computer Networks, J Supercomput