Seyong Lee

Highlights

OpenACC data model

This paper describes how the OpenACC data model is implemented in current OpenACC compilers, ranging from research compilers (OpenUH and OpenARC) to a commercial compiler (the PGI OpenACC compiler).…

Figure 1  Level-Synchronous BFS algorithm designed for EMU architecture

EMU is a novel architecture that provides scalable access to a com- mon partitioned global address space (PGAS) through a simple programming interface. The hardware is hierarchically organized as…

NVL-C System

Substantial advances in nonvolatile memory (NVM) technologies have motivated widespread integration of NVM into mobile, enterprise, and HPC systems.  Recently, considerable research has focused…

NVL-C System

Computer architecture experts expect that NVM hierarchies will play a more significant role in future systems including mobile, enterprise, and HPC architectures. With this expectation in mind, we…

Design Quality vs. Level of Representation

The frequency of hardware errors in HPC systems continues to grow as system designs evolve toward exascale. Tolerating these errors efficiently and effectively will require software-based resilience…

DRAGON

Heterogeneous computing with accelerators is growing in importance in high performance computing (HPC), deep learning (DL), and other areas. Recently, application datasets have expanded beyond the…

Fig. 1.  Proposed hybrid method to adapt the computation and synchronization to different wavefront problems and workspace matrices.

Wavefront loops are widely used in many scientific applications, e.g., partial differential equation (PDE) solvers and sequence alignment tools. However, due to the data dependencies in wavefront…

Fig. 1.  Single GPU Tests on NVIDIA P100. The results show that indirect addressing outperforms locally direct addressing, and CSoA memory layout outperforms SoA and bundling memory layouts.

GPU performance of the lattice Boltzmann method (LBM) depends heavily on memory access patterns. When LBM is advanced with GPUs on complex computational domains, geometric data is typically accessed…

Fig. 1.  Comparison of directive-based FPGA approach with directive-based CPU and GPU approaches.

Reconfigurable architectures like Field Programmable Gate Arrays (FPGAs) have been used for accelerating computations from several domains because of their unique combination of flexibility,…

Fig. 1.  Tuyere integrates application, mapping, and system knowledge into hardware simulations.

Memory technologies are under active development. Meanwhile, workloads on contemporary computing systems are increasing rapidly in size and diversity. Such dynamics in hardware and software further…

juggler

In this study we have proposed Juggler, a new, dynamic task-based execution scheme for GPGPU applications with data dependences. Different from previous studies, Juggler implements an in-GPU runtime…