Add 6_2

Author: bluekds

Book_BJ/Chap6/6_2_DeviceQuery/6_2.cu

@@ -0,0 +1,30 @@
+#include "cuda_runtime.h"
+#include "device_launch_parameters.h"
+#include "helper_cuda.h"
+
+#include <stdio.h>
+
+#define _1MB (1024*1024)
+
+void main(void) {
+    int ngpus;
+    cudaGetDeviceCount(&ngpus);
+
+    for (int i = 0; i < ngpus; i++) {
+        cudaDeviceProp devProp;
+
+        cudaGetDeviceProperties(&devProp, i);
+
+        printf("Device %d: %s\n"
+            , i, devProp.name);
+        printf("\tCompute capability: %d.%d\n"
+            , devProp.major, devProp.minor);
+        printf("\tThe number of steraming multiprocesors: %d\n"
+            , devProp.multiProcessorCount);
+        printf("\tThe number of CUDA cores: %d\n"
+            , _ConvertSMVer2Cores(devProp.major, devProp.minor)
+              * devProp.multiProcessorCount);
+        printf("\tGlobal memory size: %.2f MB"
+            , (float)devProp.totalGlobalMem / _1MB);
+    }
+}