0_Simple__simplePrintf

在设备代码中使用函数 printf()，没有新的认识。

▶ 源代码

 #include <stdio.h>
 #include <cuda_runtime.h>
 #include "device_launch_parameters.h"
 #include <helper_functions.h>
 #include <helper_cuda.h>

 __global__ void testKernel(int val)
 {
     printf("[%d, %d]:\t\tValue is:%d\n", blockIdx.y*gridDim.x + blockIdx.x, threadIdx.z*blockDim.x*blockDim.y + threadIdx.y*blockDim.x + threadIdx.x, val);
 }

 int main(int argc, char **argv)
 {
     int devID;
     cudaDeviceProp props;
     devID = findCudaDevice(argc, (const char **)argv);
     cudaGetDevice(&devID);
     cudaGetDeviceProperties(&props, devID);
     printf("Device %d: \"%s\" with Compute %d.%d capability\n",devID, props.name, props.major, props.minor);

     dim3 dimGrid(, );
     dim3 dimBlock(, , );
     testKernel<<<dimGrid, dimBlock>>>();
     cudaDeviceSynchronize();

     getchar();
     return ;
 }

▶ 输出结果

GPU Device : "GeForce GTX 1070" with compute capability 6.1

Device  : "GeForce GTX 1070" with Compute 6.1 capability
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