113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
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// =================================================================================================
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// This file is part of the CLBlast project. The project is licensed under Apache Version 2.0. This
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// project loosely follows the Google C++ styleguide and uses a tab-size of two spaces and a max-
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// width of 100 characters per line.
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//
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// Author(s):
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// Cedric Nugteren <www.cedricnugteren.nl>
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//
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// This file demonstrates the use of the DGEMV routine. It is pure C99 and demonstrates the use of
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// the C API to the CLBlast library.
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//
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// Note that this example is meant for illustration purposes only. CLBlast provides other programs
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// for performance benchmarking ('client_xxxxx') and for correctness testing ('test_xxxxx').
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//
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// =================================================================================================
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define CL_TARGET_OPENCL_VERSION 120
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#define CL_USE_DEPRECATED_OPENCL_1_2_APIS // to disable deprecation warnings
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// Includes the CLBlast library (C interface)
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#include <clblast_c.h>
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// =================================================================================================
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// Example use of the double-precision routine DGEMV
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int main(void) {
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// OpenCL platform/device settings
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const size_t platform_id = 0;
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const size_t device_id = 0;
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// Example DGEMV arguments
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const size_t m = 128;
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const size_t n = 289;
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const double alpha = 0.7;
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const double beta = 0.0;
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const size_t a_ld = n;
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// Initializes the OpenCL platform
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cl_uint num_platforms;
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clGetPlatformIDs(0, NULL, &num_platforms);
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cl_platform_id* platforms = (cl_platform_id*)malloc(num_platforms*sizeof(cl_platform_id));
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clGetPlatformIDs(num_platforms, platforms, NULL);
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cl_platform_id platform = platforms[platform_id];
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// Initializes the OpenCL device
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cl_uint num_devices;
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clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, 0, NULL, &num_devices);
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cl_device_id* devices = (cl_device_id*)malloc(num_devices*sizeof(cl_device_id));
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clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, num_devices, devices, NULL);
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cl_device_id device = devices[device_id];
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// Creates the OpenCL context, queue, and an event
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cl_context context = clCreateContext(NULL, 1, &device, NULL, NULL, NULL);
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cl_command_queue queue = clCreateCommandQueue(context, device, 0, NULL);
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cl_event event = NULL;
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// Populate host data structures with some example data
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double* host_a = (double*)malloc(sizeof(double)*m*n);
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double* host_x = (double*)malloc(sizeof(double)*n);
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double* host_y = (double*)malloc(sizeof(double)*m);
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for (size_t i=0; i<m*n; ++i) { host_a[i] = 12.193; }
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for (size_t i=0; i<n; ++i) { host_x[i] = -8.199; }
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for (size_t i=0; i<m; ++i) { host_y[i] = 0.0; }
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// Copy the data-structures to the device
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cl_mem device_a = clCreateBuffer(context, CL_MEM_READ_WRITE, m*n*sizeof(double), NULL, NULL);
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cl_mem device_x = clCreateBuffer(context, CL_MEM_READ_WRITE, n*sizeof(double), NULL, NULL);
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cl_mem device_y = clCreateBuffer(context, CL_MEM_READ_WRITE, m*sizeof(double), NULL, NULL);
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clEnqueueWriteBuffer(queue, device_a, CL_TRUE, 0, m*n*sizeof(double), host_a, 0, NULL, NULL);
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clEnqueueWriteBuffer(queue, device_x, CL_TRUE, 0, n*sizeof(double), host_x, 0, NULL, NULL);
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clEnqueueWriteBuffer(queue, device_y, CL_TRUE, 0, m*sizeof(double), host_y, 0, NULL, NULL);
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// Call the DGEMV routine.
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CLBlastStatusCode status = CLBlastDgemv(CLBlastLayoutRowMajor, CLBlastTransposeNo,
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m, n,
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alpha,
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device_a, 0, a_ld,
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device_x, 0, 1,
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beta,
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device_y, 0, 1,
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&queue, &event);
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// Wait for completion
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if (status == CLBlastSuccess) {
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clWaitForEvents(1, &event);
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clReleaseEvent(event);
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}
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// Example completed. See "clblast_c.h" for status codes (0 -> success).
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printf("Completed DGEMV with status %d\n", status);
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// Clean-up
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free(platforms);
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free(devices);
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free(host_a);
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free(host_x);
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free(host_y);
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clReleaseMemObject(device_a);
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clReleaseMemObject(device_x);
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clReleaseMemObject(device_y);
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clReleaseCommandQueue(queue);
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clReleaseContext(context);
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return 0;
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}
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// =================================================================================================
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