從OpenCL中獲取的設備列表中確定主機CPU？

Question

我打電話給clGetDeviceIDs，傳遞一組cl_device_id並獲取所有可能的設備。現在從這個列表中我想刪除實際上是主機CPU的設備？ 有沒有任何傻瓜證明的方式來做到這一點？ 由於可能安裝了2個完全相同的CPU，因此cl_device_info在區分2個CPU時可能沒有幫助？

Answer 1

OpenCL中的1.1和更高版本，可以檢查設備和主機必須使用CL_DEVICE_HOST_UNIFIED_MEMORY與clGetDeviceInfo統一的存儲器子系統。

Answer 2

試試這個代碼，它會給你想要的控制客戶端設備。

//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);