Gangwon Jo

Ph.D. Student
Multicore Computing Research Laboratory
Department of Computer Science and Engineering
Seoul National University
Seoul 151-744, Korea
gangwon at aces.snu.ac.kr

Research Interests

Programming environments and runtime systems for heterogeneous systems
High performance computing applications
Inter-node communication

Research Activities

Current

Auto-vectorization for OpenCL kernels
Memory management technique for heterogeneous clusters
OpenCL framework for multicore ARM processors and manycore accelerators
Contributing to SnuCL, an OpenCL framework for heterogeneous clusters
Implementing LINPACK benchmark for heterogeneous clusters with multi-GPU nodes

Contributing to SNU NPB Suite, a set of the NAS Parallel Benchmarks implemented in OpenCL
Compiler optimizations for the V8 JavaScript Engine

Education

Ph.D. Student

Mar. 2010 - present

Department of Computer Science and Engineering, Seoul National University, Korea
Advisor: Dr. Jaejin Lee
B.S. in Computer Science and Engineering (Summa Cum Laude)

Mar. 2006 - Feb. 2010

Seoul National University, Korea

Publications

International

Sangmin Seo, Jun Lee, Gangwon Jo, and Jaejin Lee. Automatic OpenCL Work-Group Size Selection for Multicore CPUs, In Proceedings of the 22nd International Conference on Parallel Architectures and Compilation Techniques (PACT), 2013.
Jungwon Kim, Sangmin Seo, Jun Lee, Jeongho Nah, Gangwon Jo, and Jaejin Lee. SnuCL: an OpenCL Framework for Heterogeneous CPU/GPU Clusters, In Proceedings of the 26th International Conference on Supercomputing (ICS), 2012.
Jungwon Kim, Sangmin Seo, Jun Lee, Jeongho Nah, Gangwon Jo, and Jaejin Lee. OpenCL as a Unified Programming Model for Heterogeneous CPU/GPU Clusters, Poster presentation in Proceedings of the 17th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming (PPoPP), 2012.
Sangmin Seo, Gangwon Jo, and Jaejin Lee. Performance Characterization of the NAS Parallel Benchmarks in OpenCL, In Proceedings of the 2011 IEEE International Symposium on Workload Characterization (IISWC), 2011.
Jungwon Kim, Sangmin Seo, Jun Lee, Jeongho Nah, Gangwon Jo, and Jaejin Lee. OpenCL as a Programming Model for GPU Clusters, In Proceedings of the 24th International Workshop on Languages and Compilers for Parallel Computing (LCPC), 2011.

Domestic

Gangwon Jo, Sangmin Seo, Jeongho Nah, Jungwon Kim, Junghyun Kim, Jun Lee, Jungho Park, Yong-Jun Lee, Hongjune Kim, Sooyeon Kang, Jinyoung Joo, Seonmyeong Park, Wookeun Jung, Kihyun Im, and Jaejin Lee Trends on Heterogeneous Supercomputers and a Case Study on the Development of a Supercomputer Chundoong, Communications of KIISE 31(4), 2013.
Jeongho Nah, Gangwon Jo, Sooyeon Kang, Wookeun Jung, and Jaejin Lee. Design and Implementation of Virtual Machines as an Aid in Teaching Computer Concepts, Poster presentation in Korea Computer Congress 2012 (KCC), 2012.
Jeongho Nah, Honggyu Kim, Hongjune Kim, Gangwon Jo, and Jaejin Lee. Implementation of Register Allocator for JavaScript JIT Compiler, 2011 KIISE Fall Conference, 2011.
Hongjune Kim, Joo Hwan Lee, Gangwon Jo, and Jaejin Lee. Measuring JavaScript Performance with a Real World Web Application, 2011 KIISE Fall Conference, 2011.
Gangwon Jo, Hongjune Kim, Joo Hwan Lee, Jeongho Nah, and Jaejin Lee. Alias Analysis for JavaScript Program Optimization, Poster presentation in Korea Computer Congress 2011 (KCC), 2011.

Experience

Teaching Assistant

Mar. 2013 - Jun. 2013

4190.414A Multicore Computing, Spring 2013
Teaching Assistant

Mar. 2012 - Jun. 2012

4190.409 Compilers, Spring 2012
Teaching Assistant

Mar. 2011 - Jun. 2011

010.133-005 Digital Computer Concept and Practice, Spring 2011
Teaching Assistant

Mar. 2010 - Jun. 2010

010.133-010 Digital Computer Concept and Practice, Spring 2010

Honors and Awards

Graduate Student Fellowship

Aug. 2010 - present

Korea Foundation for Advanced Studies
19th Place

Feb. 2010

The 2010 ACM-ICPC World Finals, Harbin, China
14th Place

Mar. 2007

The 2007 ACM-ICPC World Finals, Tokyo, Japan
Presidental Science Scholarship

Mar. 2006 - Feb. 2010

Korea Science and Engineering Foundation
Silver Medal

Aug. 2005

The 17th International Olympiad in Informatics, Nowy Sącz, Poland

Supercomputers

Anyone can build a fast CPU. The trick is to build a fast system. - Seymour Cray

SnuCore

SnuCore is a 16-node experimental heterogeneous CPU/GPU cluster built in November 2011. Each node of SnuCore contains two 12-core AMD Opteron 6172 CPUs and three AMD Radeon HD 6990 graphics cards. We optimized HPL (High Performance Linpack) for multiple GPUs and have achieved 15.9 TFLOPS (991 GFLOPS per node). Click here to read news articles (in Korean)

Chundoong

Chundoong (Korean: 천둥; IPA: [cʰən.duŋ]) is a self-made 56-node heterogeneous CPU/GPU cluster built in October 2012. The word 'chundoong' means thunder in Korean. Each node of Chundoong contains two 8-core Intel Xeon E5-2650 CPUs and four AMD Radeon HD 7970 GPUs. A self-made water cooling system for CPUs and GPUs are equipped. Chundoong have achieved 106.8 TFLOPS (1.907 TFLOPS per node) on the Linpack benchmark. It is ranked #277 in the Top500 list of November 2012, and #32 in the Green500 list of November 2012.