OpenCL deviceQuery Sample

/* https://www.sharcnet.ca/help/index.php/OpenCL
Compile: gcc -Wall -I/usr/include -o deviceQuery -lOpenCL deviceQuery.c
*/

#include <stdio.h>
#include <CL/cl.h>

int main(int argc, char** argv) {
   char dname[500];
   cl_device_id devices[10];
   cl_uint num_devices,entries;
   cl_ulong long_entries;
   int d;
   cl_int err;
   cl_platform_id platform_id = NULL;
   size_t p_size;

/* obtain list of platforms available */
   err = clGetPlatformIDs(1, &platform_id,NULL);
   if (err != CL_SUCCESS)
   {
       printf("Error: Failure in clGetPlatformIDs,error code=%d \n",err);
       return 0;
   }

/* obtain information about platform */
   clGetPlatformInfo(platform_id,CL_PLATFORM_NAME,500,dname,NULL);
   printf("CL_PLATFORM_NAME = %s\n", dname);
   clGetPlatformInfo(platform_id,CL_PLATFORM_VERSION,500,dname,NULL);
   printf("CL_PLATFORM_VERSION = %s\n", dname);

/* obtain list of devices available on platform */
   clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_ALL, 10, devices, &num_devices);
   printf("%d devices found\n", num_devices);

/* query devices for information */
   for (d = 0; d < num_devices; ++d) {
       clGetDeviceInfo(devices[d], CL_DEVICE_NAME, 500, dname,NULL);
       printf("Device #%d name = %s\n", d, dname);
       clGetDeviceInfo(devices[d],CL_DRIVER_VERSION, 500, dname,NULL);
       printf("\tDriver version = %s\n", dname);
       clGetDeviceInfo(devices[d],CL_DEVICE_GLOBAL_MEM_SIZE,sizeof(cl_ulong),&long_entries,NULL);
       printf("\tGlobal Memory (MB):\t%llu\n",long_entries/1024/1024);
       clGetDeviceInfo(devices[d],CL_DEVICE_GLOBAL_MEM_CACHE_SIZE,sizeof(cl_ulong),&long_entries,NULL);
       printf("\tGlobal Memory Cache (MB):\t%llu\n",long_entries/1024/1024);
       clGetDeviceInfo(devices[d],CL_DEVICE_LOCAL_MEM_SIZE,sizeof(cl_ulong),&long_entries,NULL);
       printf("\tLocal Memory (KB):\t%llu\n",long_entries/1024);
       clGetDeviceInfo(devices[d],CL_DEVICE_MAX_CLOCK_FREQUENCY,sizeof(cl_ulong),&long_entries,NULL);
       printf("\tMax clock (MHz) :\t%llu\n",long_entries);
       clGetDeviceInfo(devices[d],CL_DEVICE_MAX_WORK_GROUP_SIZE,sizeof(size_t),&p_size,NULL);
       printf("\tMax Work Group Size:\t%d\n",p_size);
       clGetDeviceInfo(devices[d],CL_DEVICE_MAX_COMPUTE_UNITS,sizeof(cl_uint),&entries,NULL);
       printf("\tNumber of parallel compute cores:\t%d\n",entries);
   }

   return 0;
}