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GPU Programming with Java
The document provides an overview of GPU programming using Java, focusing on the distinction between GPU and CPU architectures, stream processing, and general-purpose GPU (GPGPU) techniques. It discusses programming interfaces such as CUDA and OpenCL, including prerequisites for hardware and software needed to implement GPU programming with Java. Additionally, it highlights challenges related to GPU programming and references resources for demo programs.
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An introduction to GPU programming in Java by Pramuditha Aravinda and Kelum Senanayake, outlining the session's content.
Covers GPU basics, its architecture, and the advantages of GPUs over CPUs in processing tasks, especially in parallel processing.
Details the stream processing paradigm and its relation to GPU usage, emphasizing how GPGPU modifies algorithms for efficient processing.
Discusses the complexity of programming GPUs with various interfaces like CUDA, OpenCL, and the benefits of accessing parallelism.
Introduces CUDA architecture, usage scenarios and its benefits for developers in scientific computations and simulations.
Explains OpenCL, its cross-platform capabilities, and the need for Java bindings to interface with OpenCL in GPU programming.
Lists the necessary hardware (OpenCL capable GPUs) and software (OpenCL drivers, Java bindings) required for setting up GPU programming.
References a demo program based on available JOCL tutorials to illustrate GPU programming concepts.
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GPU Programming with Java
- 1. GPU programming withJava Pramuditha Aravinda. Kelum Senanayake.
- 2. Outline What is GPU. CPU vs. GPU Architecture. What is Stream processing. General Purpose GPU. CUDA. OpenCL Demo
- 3. What is GPU Graphics processing unit. Specialized microprocessor. Very efficient at manipulating computer graphics. Offloads and accelerates graphics rendering from the CPU. Dedicated to calculating floating point operations. Highly parallel structure. More effective for a range of complex algorithms. GPU can be present on, Video card. Motherboard CPU die (certain Core Intel CPUs)
- 4. CPU vs. GPUArchitecture The GPU devotes more transistors to data processing. GPU : A Highly Parallel, Multithreaded, Manycore Processor
- 5. CPU vs. GPUcontd…
- 6. What is Streamprocessing Is a computer programming paradigm, related to SIMD. Allows applications to easily exploit a limited form of parallel processing. Terminology Stream :- A set of data Kernel functions :- A series of operations Uniform streaming :- One kernel function is applied to all elements in the stream. Stream processing is driven by a data-centric model Image, video and digital signal processing Less efficient in general purpose processing with more randomized data access (such as databases)
- 7. General Purpose GPU The GPU is, by design, a stream processing system. GPGPU is a programming methodology. Modifying algorithms to run on existing GPU hardware Capable of performing simple operations on a stream of input data with amazing speed. Allows software developers to use stream processing on non-graphics data.
- 8. How hard isit? The languages are not very easy to use. Most GPU cards still operate on assembly language. The process flow is unique. Typically simple branching statement, such as if statements, offer such a performance penalty that it is often faster to process both conditions. The unique Stream-In-Stream-Out design is not typically used in CPU programs. The need to work with geometric primitives in order to push mathematical inputs to the system. Rapidly growing community.
- 9. Programming GPUs! Plenty of interfaces Compute Unified Device Architecture (CUDA) OpenCL OpenGL Shader Language (GLSL) DirectX/DirectCompute/HLSL ATI Stream
- 10. CUDA Compute Unified Device Architecture. Parallel computing architecture developed by NVIDIA. Programmers use C for CUDA. C with NVIDIA extensions and certain restrictions. Third party wrappers are also available for Python, Perl, Fortran, Java, Ruby, Lua, MATLAB and IDL. Currently used in, SETI@Home Distributed Calculations, such as predicting the native conformation of proteins Accelerated inter conversion of video file formats Physical simulations, in particular in fluid dynamics
- 11.
- 12. OpenCL Open Computing Language. Managed by the non-profit technology consortium Khronos Group Framework for writing programs that execute across heterogeneous platforms consisting of CPUs, GPUs, and other processors. Includes a language (based on C99) for writing kernels. APIs to define and then control the platforms. Supports both AMD/ATI and NVIDIA.
- 13. Programming GPU withJava and OpenCL We need to program using a GPGPU driver However most GPGPU drivers are available as a native dll only. We need another layer to interface to Java runtime. Called Java Binding
- 14. Java Binding UserProgram.class Jocl.jar Jocl.dll OpenCL.dll
- 15. Prerequisites - Hardware OpenCL capable graphic card. nVidea – All CUDA enabled GPU have OpenCL support. GeForce 8xxx or higher with 256MB minimum. http://www.nvidia.com/object/cuda_gpus.html AMD ATI Radeon™ HD 5400 or higher, AMD Radeon™ HD 6800 series or higher. AMD X86 CPU w/ SSE 2.x or later are also supported. http://developer.amd.com/gpu/AMDAPPSDK/pages/DriverCom patibility.aspx
- 16. Prerequisites - Software OpenCL driver. – for nVidia GPUs, Usually OpenCL drivers are distributed with graphic card drivers. http://developer.nvidia.com/object/opencl-download.html Java bindings for OpenCL. – Usually there are two parts Platform dependent dll. e.g. jocl-windows-x86.dll Platform independent jar file. Jocl.jar There are few Implementations. http://jogamp.org/deployment/webstart/archive/jocl-0.9-b1- 20101213-windows-i586.zip JDK http://www.oracle.com/technetwork/java/javase/downloads/ind ex.html
- 17. Demo Program Based on sample program available at http://jogamp.org/wiki/index.php/JOCL_Tutorial