運行OpenCl程序

Question

我是OpenCl的新手，我在運行我的第一個代碼時遇到了問題。我有一塊ATI顯卡，我已經在這裏做了必要的安裝http://www.thebigblob.com/getting-started-with-opencl-and-gpu-computing/。以下是我從該網站上挑選的代碼來測試我的設置。

#include <stdio.h> 
#include <stdlib.h> 

#ifdef __APPLE__ 
#include <OpenCL/opencl.h> 
#else 
#include <CL/cl.h> 
#endif 

#define MAX_SOURCE_SIZE (0x100000) 

int main(void) { 
    // Create the two input vectors 
    int i; 
const int LIST_SIZE = 1024; 
int *A = (int*)malloc(sizeof(int)*LIST_SIZE); 
int *B = (int*)malloc(sizeof(int)*LIST_SIZE); 
for(i = 0; i < LIST_SIZE; i++) { 
    A[i] = i; 
    B[i] = LIST_SIZE - i; 
} 

// Load the kernel source code into the array source_str 
FILE *fp; 
char *source_str; 
size_t source_size; 

fp = fopen("vector_add_kernel.cl", "r"); 
if (!fp) { 
    fprintf(stderr, "Failed to load kernel.\n"); 
    exit(1); 
} 
source_str = (char*)malloc(MAX_SOURCE_SIZE); 
source_size = fread(source_str, 1, MAX_SOURCE_SIZE, fp); 
fclose(fp); 

// Get platform and device information 
cl_platform_id platform_id = NULL; 
cl_device_id device_id = NULL; 
cl_uint ret_num_devices; 
cl_uint ret_num_platforms; 
cl_int ret = clGetPlatformIDs(1, &platform_id, &ret_num_platforms); 
ret = clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_ALL, 1, 
     &device_id, &ret_num_devices); 

// Create an OpenCL context 
cl_context context = clCreateContext(NULL, 1, &device_id, NULL, NULL, &ret); 

// Create a command queue 
cl_command_queue command_queue = clCreateCommandQueue(context, device_id, 0, &ret); 

// Create memory buffers on the device for each vector 
cl_mem a_mem_obj = clCreateBuffer(context, CL_MEM_READ_ONLY, 
     LIST_SIZE * sizeof(int), NULL, &ret); 
cl_mem b_mem_obj = clCreateBuffer(context, CL_MEM_READ_ONLY, 
     LIST_SIZE * sizeof(int), NULL, &ret); 
cl_mem c_mem_obj = clCreateBuffer(context, CL_MEM_WRITE_ONLY, 
     LIST_SIZE * sizeof(int), NULL, &ret); 

// Copy the lists A and B to their respective memory buffers 
ret = clEnqueueWriteBuffer(command_queue, a_mem_obj, CL_TRUE, 0, 
     LIST_SIZE * sizeof(int), A, 0, NULL, NULL); 
ret = clEnqueueWriteBuffer(command_queue, b_mem_obj, CL_TRUE, 0, 
     LIST_SIZE * sizeof(int), B, 0, NULL, NULL); 

// Create a program from the kernel source 
cl_program program = clCreateProgramWithSource(context, 1, 
     (const char **)&source_str, (const size_t *)&source_size, &ret); 

// Build the program 
ret = clBuildProgram(program, 1, &device_id, NULL, NULL, NULL); 

// Create the OpenCL kernel 
cl_kernel kernel = clCreateKernel(program, "vector_add", &ret); 

// Set the arguments of the kernel 
ret = clSetKernelArg(kernel, 0, sizeof(cl_mem), (void *)&a_mem_obj); 
ret = clSetKernelArg(kernel, 1, sizeof(cl_mem), (void *)&b_mem_obj); 
ret = clSetKernelArg(kernel, 2, sizeof(cl_mem), (void *)&c_mem_obj); 

// Execute the OpenCL kernel on the list 
size_t global_item_size = LIST_SIZE; // Process the entire lists 
size_t local_item_size = 64; // Process in groups of 64 
ret = clEnqueueNDRangeKernel(command_queue, kernel, 1, NULL, 
     &global_item_size, &local_item_size, 0, NULL, NULL); 

// Read the memory buffer C on the device to the local variable C 
int *C = (int*)malloc(sizeof(int)*LIST_SIZE); 
ret = clEnqueueReadBuffer(command_queue, c_mem_obj, CL_TRUE, 0, 
     LIST_SIZE * sizeof(int), C, 0, NULL, NULL); 

// Display the result to the screen 
for(i = 0; i < LIST_SIZE; i++) 
    printf("%d + %d = %d\n", A[i], B[i], C[i]); 

// Clean up 
ret = clFlush(command_queue); 
ret = clFinish(command_queue); 
ret = clReleaseKernel(kernel); 
ret = clReleaseProgram(program); 
ret = clReleaseMemObject(a_mem_obj); 
ret = clReleaseMemObject(b_mem_obj); 
ret = clReleaseMemObject(c_mem_obj); 
ret = clReleaseCommandQueue(command_queue); 
ret = clReleaseContext(context); 
free(A); 
free(B); 
free(C); 
return 0; 
} 

...按照說明那裏。我一直收到「無法加載內核」，這意味着它無法打開文件。我從哪裏獲得內核源？有人可以告訴我如何讓它運行？在此先感謝..

gcc -c -I /home/suraj/Desktop/Intern/softwares/AMD-APP-SDK-v2.7-lnx32 
/AMD-APP-SDK-v2.7-RC-lnx32/include opencl.c -o oopencl.o 

gcc opencl.o -o host -L /home/suraj/Desktop/Intern/softwares/AMD-APP-SDK 
-v2.7-lnx32/AMD-APP-SDK-v2.7-RC-lnx32/lib/x86 -l OpenCL 

Answer 1

我剛剛通過此源代碼的練習，以及一切工作正常。您是否從github獲取內核程序？這是名爲「vector_add_kernel.cl」的第三個程序。 C程序需要內核才能真正運行。