OPENCL TM APPLICATION ANALYSIS AND OPTIMIZATION MADE EASY WITH AMD APP PROFILER AND KERNELANALYZER
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2 OPENCL TM APPLICATION ANALYSIS AND OPTIMIZATION MADE EASY WITH AMD APP PROFILER AND KERNELANALYZER Budirijanto Purnomo AMD Technical Lead, GPU Compute Tools
3 PRESENTATION OVERVIEW Motivation AMD APP Profiler Overview of key features Live demonstration AMD APP KernelAnalyzer Overview of key features Live demonstration Best practices 3 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
4 MOTIVATION OpenCL TM An open standard platform to program heterogeneous systems Supported by the Khronos group Exposes the massive, multithreaded GPUs Order of magnitude performance improvement Future hardware architecture 4 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
5 MOTIVATION But it can challenging to achieve high performance Manage multiple OpenCL contexts, command queues and devices Manage memory explicitly Manage synchronization Balance the system resources Understand the target hardware architecture 5 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
6 AMD APP PROFILER What is AMD APP PROFILER? A performance analysis tool that gathers data from the OpenCL TM run-time and AMD APUs and GPUs during the execution of an OpenCL application Integrated into Microsoft Visual Studio 2008 and 2010 Command line utility program for Windows and Linux platforms Support OpenCL and DirectCompute No code or project modifications to target application necessary 6 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
7 AMD APP PROFILER Key Features Analyze, Debug and Profile OpenCL applications API Trace View: View API input arguments and output results Summary Pages: Find API hotspots, top ten data transfer and kernel execution operations API Trace Analyzer: Identify failed API calls, resource leaks and best practices 7 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
8 AMD APP PROFILER What can APP Profiler do for you? Timeline Visualization: Visualize OpenCL TM execution in a timeline chart View number of OpenCL contexts and command queues created and the relationships between these items View host and device execution Determine proper synchronization and load balancing 8 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
9 AMD APP PROFILER What can APP Profiler do for you? Session Profile View: Analyze OpenCL kernel execution for AMD Radeon GPUs Collect GPU Performance Counters The number of ALU, global and local memory instructions executed GPU utilization and memory access characteristics Shader Compiler VLIW packing efficiency Show the kernel resource usages 9 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
10 DEMONSTRATION OF AMD APP PROFILER 10 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
11 AMD APP KERNELANALYZER What is AMD APP KernelAnalyzer? A static analysis tool to compile, analyze and disassemble an OpenCL kernel for AMD Radeon GPUs A standalone product for Windows platforms Support AMD Radeon HD 2000 series up to 6000 series graphics cards Support the last twelve AMD Catalyst TM drivers (included in the tool) Support OpenCL and AMD Intermediate Language (IL) No GPUs or driver installations necessary 11 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
12 AMD APP KERNELANALYZER Key Features Compile, analyze and disassemble an OpenCL kernel for multiple Catalyst driver versions and GPU device targets View any kernel compilation warnings and errors from the OpenCL run-time View the AMD Intermediate Language (IL) and hardware disassembly (ISA) code View various statistics generated by analyzing the ISA code 12 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
13 DEMONSTRATION OF AMD APP KERNELANALYZER 13 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
14 BEST PRACTICES Collect API Trace first Remove all error and warnings reported by API Trace Analyzer if possible Use Timeline Visualization to determine possible synchronization issues Find the top bottleneck of the application using the Summary Pages Drill down the most expensive kernel using Session Profile View: This mode will change the run-time characteristics significantly Specify less counters to improve performance of profiling Use the OpenCL TM Performance Marker to visualize non-opencl code Prototype your OpenCL kernel using AMD APP KernelAnalyzer Change the GPU targets to a single ASIC to speed up compilation and analysis 14 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
15 RESOURCES All tools available for free download from Developer Support GPU Developer forum Online User Guide Knowledge Base Help Desk Support 15 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
16 AMD DEVELOPER TOOL PRESENTATIONS Monday 3.45 pm, Session 1002 Advanced OpenCL and OpenGL Debugging and Profiling Wednesday 3 pm, Session 2908 Advanced OpenCL Debugging and Profiling - A Case Study 16 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
17 QUESTIONS
18 Disclaimer & Attribution The information presented in this document is for informational purposes only and may contain technical inaccuracies, omissions and typographical errors. The information contained herein is subject to change and may be rendered inaccurate for many reasons, including but not limited to product and roadmap changes, component and motherboard version changes, new model and/or product releases, product differences between differing manufacturers, software changes, BIOS flashes, firmware upgrades, or the like. There is no obligation to update or otherwise correct or revise this information. However, we reserve the right to revise this information and to make changes from time to time to the content hereof without obligation to notify any person of such revisions or changes. NO REPRESENTATIONS OR WARRANTIES ARE MADE WITH RESPECT TO THE CONTENTS HEREOF AND NO RESPONSIBILITY IS ASSUMED FOR ANY INACCURACIES, ERRORS OR OMISSIONS THAT MAY APPEAR IN THIS INFORMATION. ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE ARE EXPRESSLY DISCLAIMED. IN NO EVENT WILL ANY LIABILITY TO ANY PERSON BE INCURRED FOR ANY DIRECT, INDIRECT, SPECIAL OR OTHER CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF ANY INFORMATION CONTAINED HEREIN, EVEN IF EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. AMD, AMD Radeon, AMD Catalyst, the AMD arrow logo, and combinations thereof are trademarks of Advanced Micro Devices, Inc. All other names used in this presentation are for informational purposes only and may be trademarks of their respective owners. OpenCL and OpenCL logo are trademarks of Apple Inc. used by permission by Khronos. Microsoft, Windows, and Visual Studio are registered trademarks of Microsoft Corporation in the United States and/or other jurisdictions Advanced Micro Devices, Inc. All rights reserved. 18 OpenCL Application Analysis and Optimization made easy with AMD APP Profiler and KernelAnalyzer June 2011
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