从OpenCL中获取的设备列表中确定主机CPU？

Question

我打电话给clGetDeviceIDs，传递一组cl_device_id并获取所有可能的设备。现在从这个列表中我想删除实际上是主机CPU的设备？ 有没有任何傻瓜证明的方式来做到这一点？ 由于可能安装了2个完全相同的CPU，因此cl_device_info在区分2个CPU时可能没有帮助？

Answer 1

OpenCL中的1.1和更高版本，可以检查设备和主机必须使用CL_DEVICE_HOST_UNIFIED_MEMORY与clGetDeviceInfo统一的存储器子系统。

Answer 2

试试这个代码，它会给你想要的控制客户端设备。

//See how many platforms do we have 
int num_platforms; 
int ret = clGetPlatformIDs(0, NULL, &num_platforms) 
if(ret != CL_SUCCESS) {fprintf(stderr, "%d\n", ret);} 

//Collect list of platforms 
cl_platform_id *platforms = (cl_platform_id*)calloc(num_platforms, sizeof(cl_platform_id)); 
ret = clGetPlatformIDs(num_platforms, platforms, NULL); 
if(ret != CL_SUCCESS) {fprintf(stderr, "%d\n", ret);} 

//Collecting list of Devices for every platform 
for(int i=0; i<num_platforms; i++){ 
    int num_CPUs, num_GPUs; 
    cl_device_id *CPUs, *GPUs; 

    //Get number of CPUs & GPUs on client machine 
    ret = clGetDeviceIDs(platforms[i], CL_DEVICE_TYPE_CPU, 0, NULL, &num_CPUs); 
    if(ret != CL_SUCCESS) {fprintf(stderr, "%d\n", ret);} 

    ret = clGetDeviceIDs(platforms[i], CL_DEVICE_TYPE_GPU, 0, NULL, &num_GPUs); 
    if(ret != CL_SUCCESS) {fprintf(stderr, "%d\n", ret);} 

    //Allocate memory & collect actual information 
    CPUs = (cl_device_id*)calloc(num_CPUs, sizeof(cl_device_id); 
    GPUs = (cl_device_id*)calloc(num_GPUs, sizeof(cl_device_id); 

    ret = clGetDeviceIDs(platforms[i], CL_DEVICE_TYPE_CPU,num_CPUs, CPUs, NULL); 
    if(ret != CL_SUCCESS) {fprintf(stderr, "%d\n", ret);} 

    ret = clGetDeviceIDs(platforms[i], CL_DEVICE_TYPE_GPU,num_GPUs, GPUs, NULL); 
    if(ret != CL_SUCCESS) {fprintf(stderr, "%d\n", ret);} 

    //Do whatever you want with Devices 
    .... 

    free(CPUs); 
    free(GPUs); 
} 

free(platforms);