About

Storage/HPC/Distributed Systems

  • Principal Systems Performance Engineer, Micron Technology.
  • PhD candidate, Department of Computer Science at Virginia Tech.

Publications

As recorded in Google Scholar, ORCID, and DBLP.

  1. Awais Khan, Hyogi Sim, Sudharshan S. Vazhkudai, Ali R. Butt, and Youngjae Kim, “An Analysis of System Balance and Architectural Trends Based on Top500 Supercomputers,” in The International Conference on High Performance Computing in Asia-Pacific Region, New York, NY, USA, 2021, pp. 11–22. 
    @inproceedings{202005:10.1145/3432261.3432263,
  author = {Khan, Awais and Sim, Hyogi and Vazhkudai, Sudharshan S. and Butt, Ali R. and Kim, Youngjae},
  title = {An Analysis of System Balance and Architectural Trends Based on Top500 Supercomputers},
  year = {2021},
  month = jan,
  isbn = {9781450388429},
  publisher = {Association for Computing Machinery},
  address = {New York, NY, USA},
  url = {https://doi.org/10.1145/3432261.3432263},
  doi = {10.1145/3432261.3432263},
  booktitle = {The International Conference on High Performance Computing in Asia-Pacific Region},
  pages = {11–22},
  numpages = {12},
  keywords = {High Performance Computing, Architectural Trends and Performance Balance Ratio, Top500 Supercomputers},
  location = {Virtual Event, Republic of Korea},
  series = {HPC Asia 2021}
}
  2. Wei Zhang, Suren Byna, Hyogi Sim, Sangkeun Lee, Sudharshan Vazhkudai, and Yong Chen, “Exploiting User Activeness for Data Retention in HPC Systems,” in Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis, New York, NY, USA, 2021. 
    @inproceedings{10.1145/3458817.3476201,
  author = {Zhang, Wei and Byna, Suren and Sim, Hyogi and Lee, Sangkeun and Vazhkudai, Sudharshan and Chen, Yong},
  title = {Exploiting User Activeness for Data Retention in HPC Systems},
  year = {2021},
  isbn = {9781450384421},
  publisher = {Association for Computing Machinery},
  address = {New York, NY, USA},
  url = {https://doi.org/10.1145/3458817.3476201},
  doi = {10.1145/3458817.3476201},
  booktitle = {Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis},
  articleno = {102},
  numpages = {14},
  keywords = {data management, storage tiering, purge policy, user behavior, storage resource management, data retention},
  location = {St. Louis, Missouri},
  series = {SC '21}
}
  3. Awais Khan, Hyogi Sim, Sudharshan S. Vazhkudai, and Youngjae Kim, “MOSIQS: Persistent Memory Object Storage With Metadata Indexing and Querying for Scientific Computing,” IEEE Access, vol. 9, pp. 85217–85231, 2021. 
    @article{202106:10.1109/ACCESS.2021.3087502,
  author = {Khan, Awais and Sim, Hyogi and Vazhkudai, Sudharshan S. and Kim, Youngjae},
  journal = {IEEE Access},
  title = {MOSIQS: Persistent Memory Object Storage With Metadata Indexing and Querying for Scientific Computing},
  year = {2021},
  volume = {9},
  number = {},
  pages = {85217-85231},
  doi = {10.1109/ACCESS.2021.3087502},
  url = {https://doi.org/10.1109/ACCESS.2021.3087502}
}
  4. Awais Khan, Hyogi Sim, Sudharshan S. Vazhkudai, Jinsuk Ma, Myeong-Hoon Oh, and Youngjae Kim, “Persistent Memory Object Storage and Indexing for Scientific Computing,” in 2020 IEEE/ACM Workshop on Memory Centric High Performance Computing (MCHPC), 2020, pp. 1–9. 
    @inproceedings{202004:10.1109/MCHPC51950.2020.00006,
  author = {Khan, Awais and Sim, Hyogi and Vazhkudai, Sudharshan S. and Ma, Jinsuk and Oh, Myeong-Hoon and Kim, Youngjae},
  booktitle = {2020 IEEE/ACM Workshop on Memory Centric High Performance Computing (MCHPC)},
  title = {Persistent Memory Object Storage and Indexing for Scientific Computing},
  year = {2020},
  month = nov,
  volume = {},
  number = {},
  pages = {1-9},
  doi = {10.1109/MCHPC51950.2020.00006}
}
  5. Hyogi Sim, Awais Khan, and Sudharshan S. Vazhkudai, “An Analysis of System Balance and Architectural Trends Based on Top500 Supercomputers,” Oak Ridge Natinal Laboratory, Oak Ridge, Tennessee, ORNL/TM-2020/1561, Aug. 2020. 
    @techreport{202003:osti_1649132,
  title = {An Analysis of System Balance and Architectural Trends Based on Top500 Supercomputers},
  author = {Sim, Hyogi and Khan, Awais and Vazhkudai, Sudharshan S.},
  institution = {Oak Ridge Natinal Laboratory},
  number = {ORNL/TM-2020/1561},
  month = aug,
  year = {2020},
  address = {Oak Ridge, Tennessee},
  url = {https://doi.org/10.2172/1649132},
  doi = {10.2172/1649132}
}
  6. Ali Anwar, Yue Cheng, Hai Huang, Jingoo Han, Hyogi Sim, Dongyoon Lee, Fred Douglis, and Ali Raza Butt, “Customizable Scale-Out Key-Value Stores,” IEEE Transactions on Parallel Distributed Systems (TPDS), vol. 31, no. 9, pp. 2081–2096, 2020. 
    @article{202002:DBLP:journals/tpds/AnwarCHHSLDB20,
  author = {Anwar, Ali and Cheng, Yue and Huang, Hai and Han, Jingoo and Sim, Hyogi and Lee, Dongyoon and Douglis, Fred and Butt, Ali Raza},
  title = {Customizable Scale-Out Key-Value Stores},
  journal = {{IEEE} Transactions on Parallel Distributed Systems (TPDS)},
  volume = {31},
  number = {9},
  pages = {2081--2096},
  year = {2020},
  url = {https://doi.org/10.1109/TPDS.2020.2982640},
  doi = {10.1109/TPDS.2020.2982640}
}
  7. Hyogi Sim, Awais Khan, Sudharshan S. Vazhkudai, Seung-Hwan Lim, Ali Raza Butt, and Youngjae Kim, “An Integrated Indexing and Search Service for Distributed File Systems,” IEEE Transactions on Parallel Distributed Systems (TPDS), vol. 31, no. 10, pp. 2375–2391, 2020. 
    @article{202001:DBLP:journals/tpds/SimKVLBK20,
  author = {Sim, Hyogi and Khan, Awais and Vazhkudai, Sudharshan S. and Lim, Seung{-}Hwan and Butt, Ali Raza and Kim, Youngjae},
  title = {An Integrated Indexing and Search Service for Distributed File Systems},
  journal = {{IEEE} Transactions on Parallel Distributed Systems (TPDS)},
  volume = {31},
  number = {10},
  pages = {2375--2391},
  year = {2020},
  url = {https://doi.org/10.1109/TPDS.2020.2990656},
  doi = {10.1109/TPDS.2020.2990656}
}
  8. Sangkuen Lee, Hyogi Sim, Youngjae Kim, and Sudharshan S. Vazhkudai, “A Programmable Shared-Memory System for an Array of Processing-in-Memory Devices,” Cluster Computing, vol. 22, no. 2, pp. 385–398, Jun. 2019. 
    @article{10.1007/s10586-018-2844-1,
  author = {Lee, Sangkuen and Sim, Hyogi and Kim, Youngjae and Vazhkudai, Sudharshan S.},
  title = {A Programmable Shared-Memory System for an Array of Processing-in-Memory Devices},
  year = {2019},
  issue_date = {June 2019},
  publisher = {Kluwer Academic Publishers},
  address = {USA},
  volume = {22},
  number = {2},
  issn = {1386-7857},
  url = {https://doi.org/10.1007/s10586-018-2844-1},
  doi = {10.1007/s10586-018-2844-1},
  journal = {Cluster Computing},
  month = jun,
  pages = {385–398},
  numpages = {14},
  keywords = {Big dataprocessing, Programmable devices, Processing-in-memory, Storage systems}
}
  9. Hyogi Sim, Geoffroy Vallee, Youngjae Kim, Sudharshan S. Vazhkudai, Devesh Tiwari, and Ali R. Butt, “An Analysis Workflow-Aware Storage System for Multi-Core Active Flash Arrays,” IEEE Transactions on Parallel Distributed Systems (TPDS), vol. 30, no. 2, pp. 271–285, Feb. 2019. 
    @article{10.1109/TPDS.2018.2865471,
  author = {Sim, Hyogi and Vallee, Geoffroy and Kim, Youngjae and Vazhkudai, Sudharshan S. and Tiwari, Devesh and Butt, Ali R.},
  title = {An Analysis Workflow-Aware Storage System for Multi-Core Active Flash Arrays},
  year = {2019},
  issue_date = {February 2019},
  publisher = {IEEE Press},
  volume = {30},
  number = {2},
  issn = {1045-9219},
  url = {https://doi.org/10.1109/TPDS.2018.2865471},
  doi = {10.1109/TPDS.2018.2865471},
  journal = {IEEE Transactions on Parallel Distributed Systems (TPDS)},
  month = feb,
  pages = {271–285},
  numpages = {15}
}
  10. Hyogi Sim, Arnab K. Paul, Eli Tilevich, Ali R. Butt, and Muhammad Shahzad, “Cslim: Automated Extraction of IoT Functionalities from Legacy C Codebases,” in Proceedings of the 20th International Conference on Distributed Computing and Networking (ICDCN), New York, NY, USA, 2019, pp. 421–426. 
    @inproceedings{10.1145/3288599.3296013,
  author = {Sim, Hyogi and Paul, Arnab K. and Tilevich, Eli and Butt, Ali R. and Shahzad, Muhammad},
  title = {Cslim: Automated Extraction of IoT Functionalities from Legacy C Codebases},
  year = {2019},
  isbn = {9781450360944},
  publisher = {Association for Computing Machinery},
  address = {New York, NY, USA},
  url = {https://doi.org/10.1145/3288599.3296013},
  doi = {10.1145/3288599.3296013},
  booktitle = {Proceedings of the 20th International Conference on Distributed Computing and Networking (ICDCN)},
  pages = {421–426},
  numpages = {6},
  keywords = {IoT, software engineering},
  location = {Bangalore, India},
  series = {ICDCN ’19}
}
  11. Hyogi Sim and Sudharshan S. Vazhkudai, “Profiling the Usage of an Extreme-Scale Archival Storage System,” in 27th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS), 2019, pp. 410–422. 
    @inproceedings{DBLP:conf/mascots/SimV19,
  author = {Sim, Hyogi and Vazhkudai, Sudharshan S.},
  title = {Profiling the Usage of an Extreme-Scale Archival Storage System},
  booktitle = {27th {IEEE} International Symposium on Modeling, Analysis, and Simulation
                 of Computer and Telecommunication Systems (MASCOTS)},
  pages = {410--422},
  publisher = {{IEEE} Computer Society},
  series = {{MASCOTS} '19},
  location = { Rennes, France },
  year = {2019},
  url = {https://doi.org/10.1109/MASCOTS.2019.00050},
  doi = {10.1109/MASCOTS.2019.00050}
}
  12. Awais Khan, Taeuk Kim, Hyunki Byun, Youngjae Kim, Sungyong Park, and Hyogi Sim, “SCISPACE: A Scientific Collaboration Workspace for File Systems in Geo-Distributed HPC Data Centers,” CoRR, vol. abs/1803.08228, 2018. 
    @article{DBLP:journals/corr/abs-1803-08228,
  author = {Khan, Awais and Kim, Taeuk and Byun, Hyunki and Kim, Youngjae and Park, Sungyong and Sim, Hyogi},
  title = {{SCISPACE:} {A} Scientific Collaboration Workspace for File Systems
                 in Geo-Distributed {HPC} Data Centers},
  journal = {CoRR},
  volume = {abs/1803.08228},
  year = {2018},
  url = {http://arxiv.org/abs/1803.08228},
  archiveprefix = {arXiv},
  eprint = {1803.08228}
}
  13. Ali Anwar, Yue Cheng, Hai Huang, Jingoo Han, Hyogi Sim, Dongyoon Lee, Fred Douglis, and Ali R. Butt, “bespoKV: Application Tailored Scale-out Key-Value Stores,” in Proceedings of the International Conference for High Performance Computing, Networking, Storage, and Analysis (SC), 2018. 
    @inproceedings{10.1109/SC.2018.00005,
  author = {Anwar, Ali and Cheng, Yue and Huang, Hai and Han, Jingoo and Sim, Hyogi and Lee, Dongyoon and Douglis, Fred and Butt, Ali R.},
  title = {bespoKV: Application Tailored Scale-out Key-Value Stores},
  year = {2018},
  publisher = {IEEE Press},
  url = {https://doi.org/10.1109/SC.2018.00005},
  doi = {10.1109/SC.2018.00005},
  booktitle = {Proceedings of the International Conference for High Performance Computing,
  	     Networking, Storage, and Analysis (SC)},
  articleno = {2},
  numpages = {16},
  location = {Dallas, Texas},
  series = {SC ’18}
}
  14. Feiyi Wang, Hyogi Sim, Cameron Harr, and Sarp Oral, “Diving into Petascale Production File Systems through Large Scale Profiling and Analysis,” in Proceedings of the 2nd Joint International Workshop on Parallel Data Storage & Data Intensive Scalable Computing Systems (PDSW-DISCS), New York, NY, USA, 2017, pp. 37–42. 
    @inproceedings{10.1145/3149393.3149399,
  author = {Wang, Feiyi and Sim, Hyogi and Harr, Cameron and Oral, Sarp},
  title = {Diving into Petascale Production File Systems through Large Scale Profiling and Analysis},
  year = {2017},
  isbn = {9781450351348},
  publisher = {Association for Computing Machinery},
  address = {New York, NY, USA},
  url = {https://doi.org/10.1145/3149393.3149399},
  doi = {10.1145/3149393.3149399},
  booktitle = {Proceedings of the 2nd Joint International Workshop on Parallel Data Storage
  	     & Data Intensive Scalable Computing Systems (PDSW-DISCS)},
  pages = {37–42},
  numpages = {6},
  location = {Denver, Colorado},
  series = {PDSW-DISCS ’17}
}
  15. Hyogi Sim, Youngjae Kim, Sudharshan S. Vazhkudai, Geoffroy R. Vallée, Seung-Hwan Lim, and Ali R. Butt, “Tagit: An Integrated Indexing and Search Service for File Systems,” in Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC), New York, NY, USA, 2017. 
    @inproceedings{10.1145/3126908.3126929,
  author = {Sim, Hyogi and Kim, Youngjae and Vazhkudai, Sudharshan S. and Vall\'{e}e, Geoffroy R. and Lim, Seung-Hwan and Butt, Ali R.},
  title = {Tagit: An Integrated Indexing and Search Service for File Systems},
  year = {2017},
  isbn = {9781450351140},
  publisher = {Association for Computing Machinery},
  address = {New York, NY, USA},
  url = {https://doi.org/10.1145/3126908.3126929},
  doi = {10.1145/3126908.3126929},
  booktitle = {Proceedings of the International Conference for High Performance Computing,
  	     Networking, Storage and Analysis (SC)},
  articleno = {5},
  numpages = {12},
  keywords = {distributed file systems, indexing methods, search process},
  location = {Denver, Colorado},
  series = {SC ’17}
}
  16. Seung-Hwan Lim, Hyogi Sim, Raghul Gunasekaran, and Sudharshan S. Vazhkudai, “Scientific User Behavior and Data-Sharing Trends in a Petascale File System,” in Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC), New York, NY, USA, 2017. 
    @inproceedings{10.1145/3126908.3126924,
  author = {Lim, Seung-Hwan and Sim, Hyogi and Gunasekaran, Raghul and Vazhkudai, Sudharshan S.},
  title = {Scientific User Behavior and Data-Sharing Trends in a Petascale File System},
  year = {2017},
  isbn = {9781450351140},
  publisher = {Association for Computing Machinery},
  address = {New York, NY, USA},
  url = {https://doi.org/10.1145/3126908.3126924},
  doi = {10.1145/3126908.3126924},
  booktitle = {Proceedings of the International Conference for High Performance Computing,
  	     Networking, Storage and Analysis (SC)},
  articleno = {46},
  numpages = {12},
  keywords = {usage measurement, distributed file systems},
  location = {Denver, Colorado},
  series = {SC ’17}
}
  17. Sangkuen Lee, Hyogi Sim, Youngjae Kim, and Sudharshan S. Vazhkudai, “AnalyzeThat: A Programmable Shared-Memory System for an Array of Processing-In-Memory Devices,” in Proceedings of the 17th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGRID), 2017, pp. 619–624. 
    @inproceedings{10.1109/CCGRID.2017.72,
  author = {Lee, Sangkuen and Sim, Hyogi and Kim, Youngjae and Vazhkudai, Sudharshan S.},
  title = {AnalyzeThat: A Programmable Shared-Memory System for an Array of Processing-In-Memory Devices},
  year = {2017},
  isbn = {9781509066100},
  publisher = {IEEE Press},
  url = {https://doi.org/10.1109/CCGRID.2017.72},
  doi = {10.1109/CCGRID.2017.72},
  booktitle = {Proceedings of the 17th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing
               (CCGRID)},
  pages = {619–624},
  numpages = {6},
  location = {Madrid, Spain},
  series = {CCGrid ’17}
}
  18. Hyogi Sim, Youngjae Kim, Sudharshan S. Vazhkudai, Devesh Tiwari, Ali Anwar, Ali R. Butt, and Lavanya Ramakrishnan, “AnalyzeThis: An Analysis Workflow-Aware Storage System,” in Proceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis (SC), New York, NY, USA, 2015. 
    @inproceedings{10.1145/2807591.2807622,
  author = {Sim, Hyogi and Kim, Youngjae and Vazhkudai, Sudharshan S. and Tiwari, Devesh and Anwar, Ali and Butt, Ali R. and Ramakrishnan, Lavanya},
  title = {AnalyzeThis: An Analysis Workflow-Aware Storage System},
  year = {2015},
  isbn = {9781450337236},
  publisher = {Association for Computing Machinery},
  address = {New York, NY, USA},
  url = {https://doi.org/10.1145/2807591.2807622},
  doi = {10.1145/2807591.2807622},
  booktitle = {Proceedings of the International Conference for High Performance Computing,
  	     Networking, Storage and Analysis (SC)},
  articleno = {20},
  numpages = {12},
  keywords = {data analytics, visualization & storage},
  location = {Austin, Texas},
  series = {SC ’15}
}
  19. Sooyong Kang, Sungmin Park, Hoyoung Jung, Hyogi Sim, and Jaehyuk Cha, “Performance Trade-Offs in Using NVRAM Write Buffer for Flash Memory-Based Storage Devices,” IEEE Transactions on Computers (TC), vol. 58, no. 6, pp. 744–758, 2009. 
    @article{DBLP:journals/tc/KangPJSC09,
  author = {Kang, Sooyong and Park, Sungmin and Jung, Hoyoung and Sim, Hyogi and Cha, Jaehyuk},
  title = {Performance Trade-Offs in Using {NVRAM} Write Buffer for Flash Memory-Based
                 Storage Devices},
  journal = {{IEEE} Transactions on Computers (TC)},
  volume = {58},
  number = {6},
  pages = {744--758},
  year = {2009},
  url = {https://doi.org/10.1109/TC.2008.224},
  doi = {10.1109/TC.2008.224}
}
  20. Hoyoung Jung, Hyogi Sim, Sungmin Park, Sooyong Kang, and Jaehyuk Cha, “LRU-WSR: integration of LRU and writes sequence reordering for flash memory,” IEEE Transactions on Consumer Electronics (TCE), vol. 54, no. 3, pp. 1215–1223, 2008. 
    @article{DBLP:journals/tce/JungSPKC08,
  author = {Jung, Hoyoung and Sim, Hyogi and Park, Sungmin and Kang, Sooyong and Cha, Jaehyuk},
  title = {{LRU-WSR:} integration of {LRU} and writes sequence reordering for
                 flash memory},
  journal = {{IEEE} Transactions on Consumer Electronics (TCE)},
  volume = {54},
  number = {3},
  pages = {1215--1223},
  year = {2008},
  url = {https://doi.org/10.1109/TCE.2008.4637609},
  doi = {10.1109/TCE.2008.4637609}
}
  21. Sungmin Park, Hoyoung Jung, Hyogi Sim, Sooyong Kang, and Jaehyuk Cha, “Using Non-Volatile RAM as a Write Buffer for NAND Flash Memory-based Storage Devices,” in 16th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS), 2008, pp. 374–376. 
    @inproceedings{DBLP:conf/mascots/ParkJSKC08,
  author = {Park, Sungmin and Jung, Hoyoung and Sim, Hyogi and Kang, Sooyong and Cha, Jaehyuk},
  editor = {Miller, Ethan L. and Williamson, Carey L.},
  title = {Using Non-Volatile {RAM} as a Write Buffer for {NAND} Flash Memory-based
                 Storage Devices},
  booktitle = {16th International Symposium on Modeling, Analysis, and Simulation
                 of Computer and Telecommunication Systems ({MASCOTS})},
  location = {Baltimore, Maryland},
  pages = {374--376},
  publisher = {{IEEE} Computer Society},
  year = {2008},
  series = {MASCOTS '08},
  url = {https://doi.org/10.1109/MASCOT.2008.4770591}
}
  22. Sungmin Park, Hoyoung Jung, Hyogi Sim, Sooyong Kang, and Jaehyuk Cha, “Write-Buffer-Aware Address Mapping for NAND Flash Memory Devices,” in 16th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS), 2008, pp. 377–378. 
    @inproceedings{DBLP:conf/mascots/ParkJSKC08a,
  author = {Park, Sungmin and Jung, Hoyoung and Sim, Hyogi and Kang, Sooyong and Cha, Jaehyuk},
  editor = {Miller, Ethan L. and Williamson, Carey L.},
  title = {Write-Buffer-Aware Address Mapping for {NAND} Flash Memory Devices},
  booktitle = {16th International Symposium on Modeling, Analysis, and Simulation
                 of Computer and Telecommunication Systems ({MASCOTS})},
  location = {Baltimore, Maryland},
  pages = {377--378},
  publisher = {{IEEE} Computer Society},
  year = {2008},
  series = {MASCOTS '08},
  url = {https://doi.org/10.1109/MASCOT.2008.4770592}
}
  23. Hoyoung Jung, Kyunghoon Yoon, Hyogi Sim, Sungmin Park, Sooyong Kang, and Jaehyuk Cha, “LIRS-WSR: Integration of LIRS and Writes Sequence Reordering for Flash Memory,” in Computational Science and Its Applications - ICCSA 2007, International Conference, Proceedings, Part I, 2007, vol. 4705, pp. 224–237. 
    @inproceedings{DBLP:conf/iccsa/JungYSPKC07,
  author = {Jung, Hoyoung and Yoon, Kyunghoon and Sim, Hyogi and Park, Sungmin and Kang, Sooyong and Cha, Jaehyuk},
  editor = {Gervasi, Osvaldo and Gavrilova, Marina L.},
  title = {{LIRS-WSR:} Integration of {LIRS} and Writes Sequence Reordering for
                 Flash Memory},
  booktitle = {Computational Science and Its Applications - {ICCSA} 2007, International
                 Conference, Proceedings, Part {I}},
  location = {Kuala Lumpur, Malaysia},
  series = {Lecture Notes in Computer Science},
  volume = {4705},
  pages = {224--237},
  publisher = {Springer},
  year = {2007},
  url = {https://doi.org/10.1007/978-3-540-74472-6\_18},
  doi = {10.1007/978-3-540-74472-6\_18}
}

CV

Please find my CV here.