By Matthew Scarpino
OpenCL in motion is a radical, hands-on presentation of OpenCL, with an eye fixed towards displaying builders the way to construct high-performance purposes in their personal. It starts via offering the center ideas in the back of OpenCL, together with vector computing, parallel programming, and multi-threaded operations, after which courses you step by step from easy info buildings to complicated capabilities.
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Extra info for OpenCL in Action: How to Accelerate Graphics and Computations
Example text
3 Matrix-vector multiplication sends it to the first device it finds. The following listing shows what this host code looks like. Notice that the source code is written in the C programming language. c file in this book’s example code. \n"); } clReleaseMemObject(mat_buff); clReleaseMemObject(vec_buff); Set kernel arguments Execute kernel The OpenCL standard and extensions 13 clReleaseMemObject(res_buff); clReleaseKernel(kernel); clReleaseCommandQueue(queue); clReleaseProgram(program); clReleaseContext(context); return 0; } This source file is long but straightforward.
In OpenCL, a context identifies a set of devices—not every possible device, but only those selected to work together. Contexts make it possible to create command queues, the structures that allow hosts to send kernels to devices. 7 discusses command queues in detail. At the time of this writing, the devices in a context must be provided by the same platform. That is, you can’t create a context containing both AMD and Nvidia devices—you have to create a different context for each platform. But a host application can manage devices using more than one context, and it can even create multiple contexts from devices in a single platform.
Appendix A explains just about everything you may want to know about SDKs. 1 Creating platform structures Each cl_platform_id structure represents a different OpenCL implementation (called a platform) installed on the host. If you’ve installed two SDKs, you’ll have two platforms installed, and your code will detect two cl_platform_id structures. In code, working with platforms is a two-step process. First you need to allocate memory for one or more cl_platform_id structures. Then you need to call clGetPlatformIDs to initialize these structures.