Jeongseob Ahn (안정섭)

I am an Associate Professor of the Department of Software & Computer Engineering and also affiliated with the Department of Artificial Intelligence at Ajou University. I am interested in building high performance cloud (& datacenter) systems with cross-layer optimization. Before joining Ajou, I contributed in building a large-scale data analytics system with a specialized hardware (called RAPID) at Oracle Labs.

Research Group: Computer Systems Laboratory (연구실 학생 모집 안내)

Research Interests

• Computer Systems and Architecture, Machine Learning Systems, Cloud/Datacenter Computing
  
  • Systems Reading Group
  • Linux Kernel Study Group
  • Useful stuffs

Teaching

• SCE213: Operating Systems (Spring 2022, Spring 2018)
• SCE394: IT Intensive Programming [Topic: Parallel Computing & Linux Internals] (Fall 2021)
• CSE561: Advanced Computer Architecture (Spring 2021, Fall 2019, Fall 2017)
• SCE212: Computer Organization and Architecture (Spring 2021, Fall 2020, Spring 2020, Fall 2019, Spring 2019, Fall 2018, Fall 2017)
• CSE812: Special Topics in Systems and Applications [Topic: Systems for ML (and ML for Systems)] (Fall 2020)
• CSE515: Advanced Operating Systems (Fall 2018)
• ICT331: Computer Organization (Spring 2018)

Experiences and Education

• Assistant/Associate Professor, Software and Computer Engineering, Ajou University, Sep. 2017 ~ Present
• Teaching Excellence Award, Ajou Univ., 2020
• Researcher, Oracle Labs, Feb. 2016 ~ Jul. 2017
• Research Fellow, Computer Science and Engineering , University of Michigan, Feb. 2015 ~ Jan. 2016
• Ph.D. in Computer Science, KAIST, Feb. 2015
  
• Outstanding Dissertation Award in Computer Science, KAIST, 2015
• Outstanding Teaching Assistant Award in Computer Science, KAIST, 2012
• M.S. in Computer Science, KAIST, Feb. 2011
• B.S. in Computer Science and Engineering, Dongguk University, Feb. 2009
• Undergraduate Research Assistant, Samsung Electronics Software Membership, Jan. 2005 ~ Jan. 2009

Students

• PhD: Jinwoo Jeong, Jonghyeon Kim, Jungmo Ahn (w/ Prof. JeongGil Ko)
• MS: Seungsu Baek
• BS: Suhyun Kim
• Collaborator: Sangjin Choi (w/ Prof. Youngjin Kwon)
• Alumni

Publications [ Google Scholar | DBLP ]

• [ATC '22] Memory Harvesting in Multi-GPU Systems with Hierarchical Unified Virtual Memory [ to appear ]
  Sangjin Choi¹, Taeksoo Kim¹, Jinwoo Jeong, Rachata Ausavarungnirun, Myeongjae Jeon, Youngjin Kwon, and Jeongseob Ahn*
  USENIX Annual Technical Conference (ATC), July 2022
  (¹ Co-first authors)

• [APSys '21] Rethinking Remote Memory Placement on Large-Memory Systems with Path Diversity [ Paper | Slides ]
  Wonkyo Choe, Sang-Hoon Kim, and Jeongseob Ahn*
  ACM SIGOPS Asia-Pacific Workshop on Systems (APSys), August 2021

• [ATC '21] Exploring the Design Space of Page Management for Multi-Tiered Memory Systems [ Paper | Code ]
  Jonghyeon Kim, Wonkyo Choe, and Jeongseob Ahn*
  USENIX Annual Technical Conference (ATC), July 2021

• [ATC '21] Zico: Efficient GPU Memory Sharing for Concurrent DNN Training [ Paper ]
  Gangmuk Lim, Jeongseob Ahn, Wencong Xiao, Youngjin Kwon, and Myeongjae Jeon
  USENIX Annual Technical Conference (ATC), July 2021

• [CAL '20] A Study of Memory Placement on Hardware-assisted Tiered Memory Systems [ Paper | Video ]
  Wonkyo Choe, Jonghyeon Kim, and Jeongseob Ahn*
  IEEE Computer Architecture Letters (CAL), 19(2), July-December 2020
  

• [TPDS '20] Reconciling Time Slice Conflicts of Virtual Machines with Dual Time Slice for Clouds [ Paper ]
  Taeklim Kim, Chang Hyun Park, Jaehyuk Huh, and Jeongseob Ahn*
  IEEE Transactions on Parallel and Distributed Systems (TPDS), 31(10), October 2020
  

• [ETT '19] LightCert: On Designing a Lighter Certificate for Resource-limited Internet of Things Devices [ Paper ]
  Hyuksang Kwon, Jeongseob Ahn, and JeongGil Ko
  Transactions on Emerging Telecommunications Technologies (ETT), 30(10), September 2019
  

• [TACO '19] Caliper: Interference Estimator for Multi-tenant Environments Sharing Architectural Resources [ Paper ]
  Ram Srivatsa Kannan, Michael Laurenzano, Jeongseob Ahn*, Jason Mars, and Lingjia Tang
  ACM Transactions on Architecture and Code Optimization (TACO), 16(3), May 2019
  

• [EuroSys '19] GrandSLAm: Guaranteeing SLAs for Jobs in Microservices Execution Frameworks [ Paper | Video | Slides ]
  Ram Srivatsa Kannan, Lavanya Subramanian, Ashwin Raju, Jeongseob Ahn*, Jason Mars, and Lingjia Tang
  ACM European Conference on Computer Systems (EuroSys), March 2019.

• [MEMSYS '18] A Load Balancing Technique for Memory Channels [ Paper ]
  Byoungchan Oh, Nam Sung Kim, Jeongseob Ahn, Bingchao Li, Ronald Dreslinski, and Trevor Mudge
  International Symposium on Memory Systems (MEMSYS), October 2018.

• [ELEX '18] Deduplicating TLB Entries for Shared Pages [ Paper ]
  Jeongseob Ahn*
  IEICE Electronics Express (ELEX), 15(14), July 2018

• [EuroSys '18] Accelerating Critical OS Services in Virtualized Systems with Flexible Micro-sliced Cores [ Paper | Video | Slides | Code ]
  Jeongseob Ahn*, Chang Hyun Park, Taekyung Heo, and Jaehyuk Huh
  ACM European Conference on Computer Systems (EuroSys), April 2018.

• [ASBD '17] How Much Computation Power do you need for Near-Data Processing in Cloud? [ Paper ]
  Namhyung Kim, Jeongseob Ahn, Sungpack Hong, Hassan Chafi, and Kiyoung Choi
  Workshop on Architectures and Systems For Big Data (ASBD), June 2017.

• [ISLPED '16] Enhancing DRAM Self-Refresh Modes for Idle Power Reduction [ Paper ]
  Byoungchan Oh, Nilmini Abeyratne, Jeongseob Ahn, Ronald Dreslinski, and Trevor Mudge
  IEEE International Symposium on Low Power Electronics and Design (ISLPED), August 2016.

• [TC '15] Fast Two-level Address Translation for Virtualized Systems [ Paper ]
  Jeongseob Ahn, Seongwook Jin, and Jaehyuk Huh
  IEEE Transactions on Computers (TC), 64(10), December 2015

• [TC '15] H-SVM: Hardware-assisted Secure Virtual Machines under a Vulnerable Hypervisor [ Paper ]
  Seongwook Jin, Jeongseob Ahn, Jinho Seol, Sanghoon Cha, Jaehyuk Huh, and Seungryoul Maeng
  IEEE Transactions on Computers (TC), 64(10), October 2015

• [MICRO '14] Micro-sliced Virtual Processors to Hide the Effect of Discontinuous CPU Availability for Consolidated Systems [ Paper | Slides ]
  Jeongseob Ahn, Chang Hyun Park, and Jaehyuk Huh
  IEEE/ACM International Symposium on Microarchitecture (MICRO), December 2014.

• [TC '12] Subspace Snooping: Exploiting Temporal Sharing Stability for Snoop Reduction [ Paper ]
  Jeongseob Ahn, Daehoon Kim, Jaehong Kim, and Jaehyuk Huh
  IEEE Transactions on Computers (TC), 61(11), November 2012.

• [ISCA '12] Revisiting Hardware-Assisted Page Walks for Virtualized Systems [ Paper | Slides ]
  Jeongseob Ahn, Seongwook Jin, and Jaehyuk Huh
  ACM/IEEE International Symposium on Computer Architecture (ISCA), June 2012.

• [HotCloud '12] Dynamic Virtual Machine Scheduling in Clouds for Architectural Shared Resources [ Paper | Slides | Code ]
  Jeongseob Ahn, Changdae Kim, Jaeung Han, Young-ri Choi, and Jaehyuk Huh
  USENIX Workshop on Hot Topics in Cloud Computing (HotCloud), June 2012.

• [MICRO '11] Architectural Support for Secure Virtualization under a Vulnerable Hypervisor [ Paper ]
  Seongwook Jin, Jeongseob Ahn, Sanghoon Cha, and Jaehyuk Huh
  IEEE/ACM International Symposium on Microarchitecture (MICRO), December 2011.

• [PACT '10] Subspace Snooping: Filtering Snoops with Operating System Support [ Paper ]
  Daehoon Kim, Jeongseob Ahn, Jaehong Kim, and Jaehyuk Huh
  ACM/IEEE International Conference on Parallel Architectures and Compilation Techniques (PACT), September 2010.

• [VHPC '10] The Effect of Multi-core on HPC Applications in Virtualized Systems [ Paper | Slides ]
  Jaeung Han, Jeongseob Ahn, Changdae Kim, Youngjin Kwon, Young-ri Choi, and Jaehyuk Huh
  Workshop on Virtualization and High-Performance Cloud Computing (VHPC), August 2010.

Academic Services

• Program Committee
  • IEEE ISPASS: 2021


• Conference External Reviewer
  • ACM/IEEE ISCA: 2019
  • ACM ASPLOS: 2016
  • IEEE HPCA: 2016, 2013
  • IEEE/ACM MICRO: 2015


• Journal Reviewer
  • IEEE Computer Architecture Letters (CAL): 2022
  • ACM Transactions on Computer Systems (TOCS): 2022, 2021, 2019
  • IEEE Transactions on Parallel and Distributed Systems (TPDS): 2021, 2012
  • IEEE Transactions on Computers (TC): 2021, 2020
  • IEEE Micro: 2020, 2019
  • ACM Transactions on Embedded Computing Systems (TECS): 2019
  • ACM Transactions on Design Automation of Electronic Systems (TODAES): 2016
  • IEEE Transactions on Cloud Computing (TCC): 2015

Contact Information

• E-mail: jsahn @ ajou.ac.kr
• Office: Paldal Hall #1004-1
• Address: Ajou University, 206 Worldcup-ro, Yeongton-gu Suwon, South Korea 16499
• Tel: +82-31-219-3823