Question

我正在使用ATI Radeon Mobility 4800 HD运行Ubuntu Lucid。 3D支持工作（即OpenGL应用程序以正常速度运行），但是当我尝试使用OpenCL时它失败了：

#include <CL/opencl.h>
#include <iostream>
#include <cstdlib>

#define CL_SAFE_CALL( call ) {                                                               \
    cl_int err = call; std::cerr << "EC: " << err << std::endl;                              \
    if(CL_SUCCESS != err){                                                                   \
      std::cerr << "Unsuccesful OpenCL call " << __FILE__ << " : " << __LINE__ << std::endl; \
      exit(EXIT_FAILURE);                                                    \
    } }

// OpenCL platform
cl_platform_id platform;

char* getPlatformInfo(cl_platform_id platform, cl_platform_info paramName){
  size_t infoSize = 0;
  CL_SAFE_CALL( clGetPlatformInfo(platform, paramName, 0, NULL, &infoSize) );
  char* info = (char*)malloc(infoSize);
  CL_SAFE_CALL( clGetPlatformInfo(platform, paramName, infoSize, info, NULL) );
  return info;
}

cl_platform_id createPlatform(){
  cl_platform_id platform;

  CL_SAFE_CALL( clGetPlatformIDs(1, &platform, NULL));
  std::cout << getPlatformInfo(platform, CL_PLATFORM_VERSION) << std::endl;
  return platform;
}

// OpenCL devices of the platform
cl_device_id device_id;

void* getDeviceInfo(cl_device_id device_id, cl_device_info paramName){
  size_t infoSize = 0;
  CL_SAFE_CALL( clGetDeviceInfo(device_id, paramName, 0, NULL, &infoSize) );

  char* info = (char*)malloc(infoSize);
  CL_SAFE_CALL( clGetDeviceInfo(device_id, paramName, infoSize, info, NULL) );
  return info;
}

cl_device_id createDevice(cl_platform_id platform, cl_device_type type){
  cl_device_id device_id;

  // THIS IS LINE 44:

  CL_SAFE_CALL( clGetDeviceIDs(platform, type, 1, &device_id, NULL) );

  cl_uint* max_compute_units = (cl_uint*)getDeviceInfo(device_id, CL_DEVICE_MAX_COMPUTE_UNITS);
  std::cout << "Max compute units: " << *max_compute_units << std::endl;

  return device_id;
}

int main(void){
  std::cerr << "createDevice:" << std::endl;
    platform = createPlatform();
  std::cerr << "createDevice:" << std::endl;
  device_id = createDevice(platform, CL_DEVICE_TYPE_GPU);
}

以下内容：

~$ g++ -o test test.cc -lOpenCL
~$ ./test
createDevice:
EC: 0
EC: 0
EC: 0
OpenCL 1.2 AMD-APP (923.1)
createDevice:
EC: -1
Unsuccesful OpenCL call test.cc : 44

我从安装中获得了libOpenCl，并且apt-get opencl-headers。有什么建议吗？

Answer 1

错误代码-1实际上意味着CL_DEVICE_NOT_FOUND（查看include \ CL文件夹中的cl.h以供参考）。这可能意味着几件事：

您的GPU视频驱动程序是什么？检查它是否完全不支持OpenCL。
您的驱动程序是最新的吗？检查您是否有最新版本。

clGetDeviceIds返回-1

1 个答案: