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Posts

Dec, 5

Mapping Streaming Applications to OpenCL

Graphic processing units (GPUs) have been gaining popularity in general purpose and high performance computing. A GPU is made up of a number of streaming multiprocessors (SM), each of which consists of many processing cores. A large number of general-purpose applications have been mapped onto GPUs efficiently. Stream processing applications, however, exhibit properties such as […]
Dec, 2

Numerical resolution of conservation laws with OpenCL

We present several numerical simulations of conservation laws on recent multicore processors, such as GPU’s, using the OpenCL programming framework. Depending on the chosen numerical method, different implementation strategies have to be considered, for achieving the best performance. We explain how to program efficiently three methods: a finite volume approach on a structured grid, a […]
Dec, 1

OpenCL Numerical Simulations of Two-Fluid Compressible Flows With a 2D Random Choice Method

In this paper, we propose a new very simple numerical method for solving liquid-gas compressible flows. Such flows are difficult to simulate because classical conservative finite volume schemes generate pressure oscillations at the liquid-gas interface. We extend to several dimensions the random choice scheme that we have previously constructed. The extension is performed through Strang […]
Nov, 29

clOpenCL – Supporting Distributed Heterogeneous Computing in HPC Clusters

Clusters that combine heterogeneous compute device architectures, coupled with novel programming models, have created a true alternative to traditional (homogeneous) cluster computing, allowing to leverage the performance of parallel applications. In this paper we introduce clOpenCL, a platform that supports the simple deployment and efficient running of OpenCL-based parallel applications that may span several cluster […]
Nov, 24

Enhancing and Porting the HPC-Lab Snow Simulator to OpenCL on Mobile Platforms

Porting a computationally demanding CUDA application to a GPU designed for mobile phones and tablets, which supports OpenCL, is the subject of this thesis. Significant effort is made to prepare the snow simulator of the HPC-LAB at IDI, NTNU, for porting to an OpenCL capable GPU for mobile phones, with a reasonably limited effort, when […]
Nov, 21

Pattern Recognition with OpenCL Heterogeneous Platform

OpenCL platform provides unified development environment for various multicore processors. In this paper, we evaluate the OpenCL framework for application in pattern recognition. We have selected the most common algorithm for Artificial Neural Networks (ANN) training – the backpropagation algorithm for parallelization with OpenCL because of its high demand for processing resources. We will show […]
Nov, 18

Real-Time Hair Simulation and Rendering with OpenCL and OpenGL

In computer graphics, human hair simulation represents a challenging issue, and is still an active research subject nowadays. The problem comprises two complementary dimensions: the physical simulation and the rendering. While both aspects must be treated individually for each strand, they must also be treated globally due to interactions between hair strands. Because of the […]
Nov, 16

CUDA and OpenCL Implementations of 3D CT Reconstruction for Biomedical Imaging

Biomedical image reconstruction applications with large datasets can benefit from acceleration. Graphic Processing Units(GPUs) are particularly useful in this context as they can produce high fidelity images rapidly. An image algorithm to reconstruct conebeam computed tomography(CT) using two dimensional projections is implemented using GPUs. The implementation takes slices of the target, weighs the projection data […]
Nov, 14

Real-Time Surface Extraction and Visualization of Medical Images using OpenCL and GPUs

Marching Cubes (MC) is an algorithm that extracts surfaces from volumetric scalar data. It is used extensively in visualization and analysis of medical data from modalities like CT and MR, usually after a 3D segmentation of the structures of interest have been performed. Implementations of MC on CPUs are slow, using several seconds (even minutes) […]
Nov, 10

Studies of quantum dots: Ab initio coupled-cluster analysis using OpenCL and GPU programming

Quantum dots, that is, strongly confined electrons, show a variety of interesting properties. Of relevance in both experiments and various technical components, is the possibility to fine tune their electrical and optical properties. Quantum dots can be manufactured by a number of different techniques in practice, but we have in this thesis employed computer simulations […]
Nov, 8

Reusable OpenCL FPGA Infrastructure

OpenCL has emerged as a standard programming model for heterogeneous systems. Recent work combining OpenCL and FPGAs has focused on high-level synthesis. Building a complete OpenCL FPGA system requires more than just high-level synthesis. This work introduces a reusable OpenCL infrastructure for FPGAs that complements previous work and specifically targets a key architectural element – […]
Nov, 6

Design and Development of an Efficient H. 264 Video Encoder for CPU/GPU using OpenCL

Video codecs have undergone dramatic improvements and increased in complexity over the years owing to various commercial products like mobiles and Tablet PCs. With the emergence of standards, such H.264 which has emerged as the de facto standard for video, uniformity in the delivery of video is observed. With constraints of memory and transmission bandwidth, […]
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