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Apr, 15

Automatic Optimization of OpenCL-Based Stencil Codes for FPGAs and Its Evaluation

Recently, C-based OpenCL design environment is proposed to design FPGA (field programmable gate array) accelerators. Although many C-programs can be executed on FPGAs, the best c-code for a CPU may not be the most appropriate one for an FPGA. Users must have some knowledge about computer architecture in order to write a good OpenCL code. […]
Mar, 31

A Comparison between GPU-based Volume Ray Casting Implementations: Fragment Shader, Compute Shader, OpenCL, and CUDA

Volume rendering is an important area of study in computer graphics, due to its application in areas such as medicine, physic simulations, oil and gas industries, and others. The main used method nowadays for volume rendering is ray casting. Nevertheless, there are a variety of parallel APIs that can be used to implement it. Thus, […]
Mar, 22

FPGA in HPC: High Level Synthesys of OpenCL kernels for Molecular Dynamics

The overall goal of this thesis is to evaluate the feasibility of FPGA based computer system in HPC. This works is performed within ExaNeSt, an EU funded project which aims to develop and prototype energy efficient solutions for the production of exascale-level supercomputers. As the matter of fact, the current computer architectures need to be […]
Mar, 17

Improved OpenCL-based Implementation of Social Field Pedestrian Model

Two aspects of improvements are proposed for the OpenCL-based implementation of the social field pedestrian model. In the aspect of algorithm, a method based on the idea of divide-and-conquer is devised in order to overcome the problem of global memory depletion when fields are of a larger size. This is of importance for the study […]
Mar, 10

Portable Real-Time DCT Based Steganography Using OpenCL

In this paper a steganographic method for real time data hiding is proposed. The main goal of the research is to develop steganographic method with increased robustness to unintentional image processing attacks. In addition, we prove the validity of the method in real time applications. The method is based on a discrete cosine transform (DCT) […]
Mar, 10

OpenCL-ready High Speed FPGA Network for Reconfigurable High Performance Computing

Field programmable gate arrays (FPGAs) have gained attention in high-performance computing (HPC) research because their computation and communication capabilities have dramatically improved in recent years as a result of improvements to semiconductor integration technologies that depend on Moore’s Law. In addition to FPGA performance improvements, OpenCL-based FPGA development toolchains have been developed and offered by […]
Mar, 3

OpenCL Acceleration for TensorFlow

There is huge demand for targeting complex and large-scale machine learning applications particularly those based on popular actively-maintained frameworks such as TensorFlow and CAFFE to a variety of platforms with accelerators ranging from high-end desktop GPUs to resource-constrained embedded or mobile GPUs, FPGAs, and DSPs. However, to deliver good performance different platforms may require different […]
Feb, 9

Combined Spatial and Temporal Blocking for High-Performance Stencil Computation on FPGAs Using OpenCL

Recent developments in High Level Synthesis tools have attracted software programmers to accelerate their high-performance computing applications on FPGAs. Even though it has been shown that FPGAs can compete with GPUs in terms of performance for stencil computation, most previous work achieve this by avoiding spatial blocking and restricting input dimensions relative to FPGA on-chip […]
Feb, 3

Efficient SIMD Vectorization for Hashing in OpenCL

Hashing is at the core of many efficient database operators such as hash-based joins and aggregations. Vectorization is a technique that uses Single Instruction Multiple Data (SIMD) instructions to process multiple data elements at once. Applying vectorization to hash tables results in promising speedups for build and probe operations. However, vectorization typically requires intrinsics – […]
Dec, 24

Pass a Pointer: Exploring Shared Virtual Memory Abstractions in OpenCL Tools for FPGAs

Heterogeneous CPU-FPGA systems are gaining momentum in the embedded systems sector and in the data center market. While the programming abstractions for implementing the data transfer between CPU and FPGA (and vice versa) that are available in today’s commercial programming tools are well-suited for certain types of applications, the CPU-FPGA communication for applications that share […]
Dec, 24

Extending OmpSs for OpenCL kernel co-execution in heterogeneous systems

Heterogeneous systems have a very high potential performance but present difficulties in their programming. OmpSs is a well known framework for task based parallel applications, which is an interesting tool to simplify the programming of these systems. However, it does not support the co-execution of a single OpenCL kernel instance on several compute devices. To […]
Dec, 19

OpenCL-accelerated Point Feature Histogram and Its Application in Railway Track Point Cloud Data Processing

To meet the requirements of railway track point cloud processing, an OpenCL-accelerated Point Feature Histogram method is proposed using heterogeneous computing to improve the low computation efficiency. According to the characteristics of parallel computing of OpenCL, the data structure for point cloud storage is reconfigured. With the kernel performance analysis by CodeXL, the data reading […]
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