Ding Yuan

About me

I am a professor in the Electrical and Computer Engineering Department and (by courtesy) Department of Computer Science, University of Toronto. I received my Ph.D from the Computer Science Department of University of Illinois, Urbana-Champaign under the supervision of a great advisor, Yuanyuan Zhou. I was also a visiting PhD student in the awesome System and Networking group of University of California, San Diego. My CV is here.

(New) My PhD student Xiang (Jenny) Ren is on the academic job market! She is GREAT!

I founded a startup company called YScope with my PhD students so that our research can make real-world impact. Check out CLP, an open-source tool that can compress text logs and search compressed logs without decompression. This Uber Engineering Blog describes a deployment case-study of CLP.

My research interest is systems software, with a focus on developing practical solutions to improve the availability and performance of large software systems.

I am a Canada Research Chair in Systems Software and a recipient of McCharles Prize for Early Career Research Distinction. I also received a few teaching awards, including the Gordon Slemon award and Student Choice Award (upper year instructor) of Faculty of Engineering. I am the vice-chair of ACM SIGOPS.

I am looking for self motivated students to work with me. If you are interested, please submit your application here.

News

2022/10: Yongle's PhD dissertation won The SIGOPS Dennis M. Ritchie Thesis Award. Congrats Yongle!

2022/9: CLP is deployed on Uber's big data platform. In 2021, Uber's growth eclipsed the capability of their existing log management tools, forcing them to start dropping Petabytes of INFO-level Spark logs due to scalability issues (e.g., capacity, SSD burn-out). We integrated CLP into their logging library (Log4j) on Uber's big data platform, achieving a 169x compression ratio. Now, all logs are retained, and efficiently analyzed, at 169x less cost. Check out Uber's Engineering Blog for more details. (Also checkout the Hacker News discussion.)

2022/9: Received Meta 2022 Systems Research Award for CLP. Thanks Meta!

2022/7: HBASE-12187 and all its subtasks have been closed and implemented. HBase developers opened HBASE-12187 to address the issues we found in our OSDI'14 paper. It consists of 9 subtasks, including integrating Aspirator checks (the tool from our paper) as a check-in policy, use other static checkers including Coverity, thorough code review, etc.

2022/7: Our ATC'22 paper on runtime performance is invited to publish in USENIX ;login:.

2022/2: Our ctFS paper is invited to publish in USENIX ;login: and ACM TOS by FAST'22 PC.

2021/8: YScope, our startup to work on our open-source log compression and search technology, is launched.

2020/5: Yongle Zhang will join Purdue as an assistant professor! Congrats Yongle!!

2020/5: Aspirator is now part of Google's error-prone static checker. See the pull request.

2019/10: Xu Zhao will join Facebook! Congrats Xu!!

2018/1: Xu Zhao won Facebook Fellowship! Congrats Xu!

[Publication] 2017/3: Our JVM warm-up paper appears in Usenix ;login:

[Impact] 2016/10: Our JVM warm-up paper is covered by The Next Platform.

[Impact] 2016/8: Caitie McCaffrey gave an amazing presentation on our Simple Testing paper in Papers We Love@QCon New York.

[Job] 2015/4: Yongle will intern in Microsoft Research Redmond this summer.

[Publication] 2015/2: Our OSDI paper on failure analysis appears in usenix ;login:

[Impact] 2014/10: HBase developers will use aspirator, a simple bug finding tool described in our OSDI paper, as their compile-time checker!

[Impact] 2014/10: Our OSDI paper on distributed system failures prompted many online discussions:

Hacker News [1], [2],
Discussions from HBase developers, which prompted a series of reactions to address the problems we mentioned in the paper.
Twitter discussions: see this, this, and this (if you're looking for a screenshot that summarizes our paper, see this or this).
Blog: the morning paper (also it is considered as a highlight of 2016), It Will Never Work In Theory, Another word for it, Metadata, Fifty Quick Ideas to Improve Your Tests, Postmortem lessons, Some discussions on Google+.
And quite a few emails sent to us from developers...

[Fun] 2014/10: Yongle and I each gave a talk in OSDI; Yongle gave a cool demo of lprof in his talk, making his advisor look bad as I did not do one in mine :)

[Publication] 2014/7: We have two papers accepted by OSDI'14!

[Job] 2014/4: Xu will go to the Bay area for a summer internship in Twitter.

Selected publications

μSlope: High Compression and Fast Search on Semi-Structured Logs. Rui Wang, Devin Gibson, Kirk Rodrigues, Yu Luo, Yun Zhang, Kaibo Wang, Yupeng Fu, Ting Chen, Ding Yuan. To appear in the Proceedings of the 18th USENIX Symposium on Operating Systems Design and Implementation (OSDI'24), July, 2024.
Relational Debugging -- Pinpointing Root Causes of Performance Problems. Xiang (Jenny) Ren, Sitao Wang, Zhuqi Jin, David Lion, Adrian Chiu, Tianyin Xu, Ding Yuan. In the Proceedings of the 17th USENIX Symposium on Operating Systems Design and Implementation (OSDI'23), July, 2023. Pages 65--80.
Investigating Managed Language Runtime Performance: Why JavaScript and Python are 8x and 29x slower than C++, yet Java and Go can be Faster? David Lion, Adrian Chiu, Michael Stumm, Ding Yuan In the Proceedings of the 2022 USENIX Annual Technical Conference (ATC'22), July 11-13, 2022. Pages 835--852. [USENIX ;login: article] [Code]
Hubble: Performance Debugging with In-Production, Just-In-Time Method Tracing on Android. Yu Luo, Kirk Rodrigues, Cuiqin Li, Feng Zhang, Lijin Jiang, Bing Xia, David Lion, and Ding Yuan. In the Proceedings of the 16th USENIX Symposium on Operating Systems Design and Implementation (OSDI'22), July 11-13, 2022. Pages 787--803.
ctFS: Replacing File Indexing with Hardware Memory Translation through Contiguous File Allocation for Persistent Memory. Ruibin Li, Xiang Ren, Xu Zhao, Siwei He, Michael Stumm, Ding Yuan In the Proceedings of the 20th USENIX Conference on File and Storage Technologies (FAST'22), Febuary 22-24, 2022. Best paper award runner up. [ACM Transaction on Storage article] [USENIX ;login: article] [Code]
Understanding and Detecting Software Upgrade Failures in Distributed Systems Yongle Zhang, Junwen Yang, Zhuqi Jin, Utsav Sethi, Kirk Rodrigues, Shan Lu, Ding Yuan. In the Proceedings of The 28th ACM Symposium on Operating Systems Principles (SOSP'21), October 25-28, 2021. [Code]
CLP: Efficient and Scalable Search on Compressed Text Logs. Kirk Rodrigues, Yu Luo, Ding Yuan. In the Proceedings of the 15th USENIX Symposium on Operating Systems Design and Implementation (OSDI'21). July 14--16, 2021. Pages 183--198. [Code]
M3: End-to-End Memory Management in Elastic Systems Software Stack. David Lion, Adrian Chiu, Ding Yuan. In the 16th ACM European Conference on Computer Systems (EuroSys 2021), April, 2021. Pages 507-522. [Code]
The Inflection Point Hypothesis: A Principled Debugging Approach for Locating the Root Cause of a Failure. Yongle Zhang, Kirk Rodrigues, Yu Luo, Michael Stumm, Ding Yuan. In the 27th ACM Symposium on Operating Systems Principles (SOSP’19), October 2019, Huntsville, Ontario, Canada. [Press: The morning paper] [USENIX ;login: article]
An Analysis of Performance Evolution of Linux's Core Operations. Xiang (Jenny) Ren, Kirk Rodrigues, Luyuan Chen, Camilo Vega, Michael Stumm, Ding Yuan. In the 27th ACM Symposium on Operating Systems Principles (SOSP’19), October 2019, Huntsville, Ontario, Canada. [Press: The morning paper] [Code]
Log20: Fully Automated Optimal Placement of Log Printing Statements under Specified Overhead Threshold. Xu Zhao, Kirk Rodrigues, Yu Luo, Michael Stumm, Ding Yuan, Yuanyuan Zhou. In the 26th ACM Symposium on Operating Systems Principles (SOSP’17), October 2017, Shanghai, China. [Press: The morning paper][Code][Impact: licensed by Netflix]
Pensieve: Non-Intrusive Failure Reproduction for Distributed Systems using the Event Chaining Approach. Yongle Zhang, Serguei Makarov, Xiang Ren, David Lion, Ding Yuan. In the 26th ACM Symposium on Operating Systems Principles (SOSP’17), October 2017, Shanghai, China.
Non-intrusive Performance Profiling of Entire Software Stacks based on the Flow Reconstruction Principle. Xu Zhao, Kirk Rodrigues, Yu Luo, Ding Yuan, and Michael Stumm. Proceedings of the 12th USENIX Symposium on Operating Systems Design and Implementation (OSDI’16), November 2016, Savannah, GA.
Don't Get Caught In the Cold, Warm-up Your JVM: Understand and Eliminate JVM Warm-up Overhead In Data-parallel Systems. David Lion, Adrian Chiu, Hailong Sun, Xin Zhuang, Nikola Grcevski, and Ding Yuan. Proceedings of the 12th USENIX Symposium on Operating Systems Design and Implementation (OSDI’16), November 2016, Savannah, GA. [Press: Invited publication: USENIX ;login: 42(1), The Next Platform][Code]
Simple Testing Can Prevent Most Critical Failures: An Analysis of Production Failures in Distributed Data-intensive Systems. Ding Yuan, Yu Luo, Xin Zhuang, Guilherme Rodrigues, Xu Zhao, Yongle Zhang, Pranay U. Jain, and Michael Stumm. Proceedings of the 11th USENIX Symposium on Operating Systems Design and Implementation (OSDI’14), October 2014, Broomfield, CO [See webpage for press, code, and impact.] [Invited publication: USENIX ;login: 40(1)]
lprof: A Non-intrusive Request Flow Profiler for Distributed Systems. Xu Zhao*, Yongle Zhang*, David Lion, Muhammad FaizanUllah, Yu Luo, Ding Yuan, and Michael Stumm. In the 11th USENIX Symposium on Operating Systems Design and Implementation (OSDI’14), October 2014, Broomfield, CO. *: Equally contributed.
Do Not Blame Users for Misconfigurations Tianyin Xu, Jiaqi Zhang, Peng Huang, Jing Zheng, Tianwei Sheng, Ding Yuan, Yuanyuan Zhou, and Shankar Pasupathy. Proceedings of the 24th ACM Symposium on Operating Systems Principles (SOSP’13), November 2013.
Be Conservative: Enhancing Failure Diagnosis with Proactive Logging Ding Yuan, Soyeon Park, Peng Huang, Yang Liu, Michael M. Lee, Xiaoming Tang, Yuanyuan Zhou, and Stefan Savage. Proceedings of the 9th ACM/USENIX Symposium on Operating Systems Design and Implementation (OSDI’12), Hollywood, CA, October 2012
Improving Software Diagnosability via Log Enhancement Ding Yuan, Jing Zheng, Soyeon Park, Yuanyuan Zhou, and Stefan Savage. ACM Transactions on Computer Systems (TOCS), Februray 2012. Fast-forwarded from ASPLOS'11.
SherLog: Error Diagnosis by Connecting Clues from Run-time Logs. Ding Yuan, Haohui Mai, Weiwei Xiong, Lin Tan, Yuanyuan Zhou, and Shankar Pasupathy. In the Proceedings of the 15th International Conference on Architecture Support for Programming Language and Operating Systems (ASPLOS’10), pages 143-154, Pittsburgh, PA., March 2010.
/* iComment: Bugs or Bad Comments? */ Lin Tan, Ding Yuan, Gopal Krishna, and Yuanyuan Zhou. In the Proceedings of the 21st ACM Symposium on Operating Systems Principles (SOSP’07), pages 145-158, October 2007.

Full publication list

Group

It is fun to work with the following incredible people:

Post-doc:

Huangshi Tian

Graduate students:

Rishikesh Devsot
Adrian Chiu
Devin Gibson
Zhuqi Jin
Ruibin Li
Zhihao Lin
Jack Luo
Xiang (Jenny) Ren
Sitao Wang
Xiaochong Wei
Haiqi Xu
Yi Fan Yu

Alumni:

Yongle Zhang, PhD 2020, First Employment: Assistant Professor, Department of Computer Science, Purdue University. Winner of The SIGOPS Dennis M. Ritchie Thesis Award.
Xu Zhao, PhD 2021, First Employment: Research Scientist@Facebook. Winner of Facebook Fellowship.
Kirk Rodrigues, PhD 2023, First Employment: Co-founder of YScope.
David Lion, PhD 2023, First Employment: Co-founder of YScope.

Hailong Sun, visiting scholar, now Professor at Beihang University
Serhei Makarov, Master of Applied Science, now at Red Hat.
Rui Wang, Master of Applied Science 2023, now at YScope.
Muhammad FaizanUllah (Undergraduate thesis) -> Microsoft
Neil Newman (Undergraduate thesis) -> graduate school@UBC
Alan Chung (Undergraduate thesis)

Teaching

ECE344 Operating Systems: [Winter24][Winter23][Winter22][Winter21][Winter20][Winter18][Winter17][Winter16][Winter15][Winter14][Winter13]
ECE454 Computer Systems Programming: [Fall18][Fall14][Fall13]
ECE244 Programming Fundamentals: [Fall22][Fall17][Fall16]
ECE1759 Graduate OS: [Fall23][Fall22][Fall21][Fall20][Fall17][Fall16][Fall14]

Program committee

2024: SOSP, OSDI
2023: SOSP, OSDI, EuroSys, EuroSys Poster (PC co-chair)
2022: OSDI
2021: OSDI, SOSP, HAOC, ASPLOS
2020: OSDI, NSDI
2019: HotOS (PC Co-chair with Jinyang Li), APSys (PC Co-chair with Yu Hua)
2018: OSDI, EuroSys, ASPLOS (ERC)
2017: SOSP, Student Research Competition@SOSP'17 (chair)
2016: ASPLOS (also chair of poster and lightning session)
2015: USENIX Annual Technical Conference, USENIX LISA, SOSP (poster PC)
2014: OSDI (external review committee), USENIX Annual Technical Conference, SIGMETRICS, USENIX ICAC
2012: USENIX Workshop on Managing Systems Automatically and Dynamically

Misc

I play a lot of sports, including basketball, skiing, swimming, and running. I was the captain of the Beihang's CSE basketball team when I was an undergrad and co-captain of the UIUC CS faculty & grad-student basketball team in the intramural games. I also ran some marathon and half-marathons (see a not-so-recent photo here). When I have more time, I also play accordion and piano.