CUDA查询设备信息：
CUDA C中的cudaGetDeviceProperties函数可以很方便的获取到设备的信息，函数原型是：
cudaError_t CUDARTAPI cudaGetDeviceProperties(struct cudaDeviceProp *prop, int device);
第一个参数prop指向的是一个cudaDeviceProp类型的结构cudaDeviceProp结构中包含了设备的相关属性，下图是 其中的几个属性信息：
图1
cudaDeviceProp 部分属性
部分属性信息的相关说明如下：
图2 属性说明
获取设备信息实现代码：
#include<cuda_runtime.h>
#include<stdio.h>
#include<iostream>
int main(int argc, char **argv)
{
printf("%s Starting...\n", argv[0]);
int deviceCount = 0;
cudaError_t error_id = cudaGetDeviceCount(&deviceCount);
if (error_id != cudaSuccess)
{
printf("cudaGetDeviceCount returned %d\n->%s\n", (int)error_id,
cudaGetErrorString(error_id));
printf("Result=FALL\n");
exit (EXIT_FAILURE);
}
if (deviceCount == 0)
{
printf("There are no available device(s) that support CUDA\n");
}
else
{
printf("Detectd %d CUDA Capable device(s)\n", deviceCount);
}
int dev, driverVersion = 0, runtimeVersion = 0;
dev = 0;
cudaSetDevice(dev);
cudaDeviceProp deviceProp;
cudaGetDeviceProperties(&deviceProp, dev);
printf("Device %d: \"%s\"\n", dev, deviceProp.name);
cudaDriverGetVersion(&driverVersion);
cudaRuntimeGetVersion(&runtimeVersion);
printf("CUDA Driver Version /Runtime Version %d.%d /%d.%d\n",
driverVersion / 1000, (runtimeVersion % 100) / 10,
runtimeVersion / 1000, (runtimeVersion % 100) / 10);
printf("CUDA Capability Major/Minor version number: %d.%d\n", deviceProp.major, deviceProp.minor);
printf("Total amount of global memory: %.2f GBytes (%llu bytes)\n",
(float)deviceProp.totalGlobalMem / (pow(1024.0, 3)), (unsigned long long)deviceProp.totalGlobalMem);
printf("GPU Clock rate: %.0f MHz (%0.2f GHz)\n", deviceProp.clockRate*1e-3f, deviceProp.clockRate*1e-6f);
printf("Memory Clock rate: %.0f Mhz\n", deviceProp.memoryClockRate*1e-3f);
printf("Memory Bus Width: %d-bit\n", deviceProp.memoryBusWidth);
if (deviceProp.l2CacheSize)
{
printf("L2 Cache Size: %d bytes\n", deviceProp.l2CacheSize);
}
printf("Max Texture Dimension Size (x,y,z) 1D=(%d),2D=(%d,%d),3D=(%d,%d,%d)\n",
deviceProp.maxTexture1D, deviceProp.maxTexture2D[0], deviceProp.maxSurface2D[1], deviceProp.maxTexture3D[0],
deviceProp.maxTexture3D[1], deviceProp.maxTexture3D[2]);
printf("Max Layered Texture Size (dim) x layers 1D=(%d) x%d,2D=(%d,%d)x %d\n", deviceProp.maxTexture1DLayered[0], deviceProp.maxSurface1DLayered[1],
deviceProp.maxTexture2DLayered[0], deviceProp.maxTexture2DLayered[1], deviceProp.maxTexture2DLayered[2]);
printf("Total amount of constant memory: %lu bytes\n", deviceProp.totalConstMem);
printf("Total amount of shared memory per block: %lu bytes\n", deviceProp.sharedMemPerBlock);
printf("Total number of registers available per block: %d\n", deviceProp.regsPerBlock);
printf("Warp size: %d\n", deviceProp.warpSize);
printf("Maximum number of threads per multiprocessor: %d\n", deviceProp.maxThreadsPerMultiProcessor);
printf("Maximum number of threads per block: %d\n", deviceProp.maxThreadsPerBlock);
printf("Maximum sizes of each dimension of a block: %d x %d x%d\n", deviceProp.maxThreadsDim[0], deviceProp.maxThreadsDim[1], deviceProp.maxThreadsDim[2]);
printf("Maximum sizes of each dimension of a block: %d x %d x%d\n", deviceProp.maxGridSize[0], deviceProp.maxGridSize[1], deviceProp.maxGridSize[2]);
printf("Maximum memory pitch: %lu bytes\n", deviceProp.memPitch);
getchar();
exit(EXIT_FAILURE);
}
查询设备信息结果如下图：
图3 设备信息
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