cuda内存分配函数

cuda内存分配函数

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一、cuda函数列表

1. cudaMalloc

int main(){
	int a = 0, *a_d;
  
	cudaMalloc((void**) &a_d, sizeof(int));
	cudaMemcpy(a_d, &a, sizeof(int), cudaMemcpyHostToDevice);

	kernel<<<1, 1>>>(a_d); 
  
	cudaMemcpy(&a, a_d, sizeof(int), cudaMemcpyDeviceToHost);

	printf("a = %d\n", a);
	cudaFree(a_d);
}

2.cudaMallocPitch

#include <iostream>
#include <cuda_runtime.h>
using namespace std;   
  
int main()  
{  
    float * pDeviceData = NULL;  
    int width = 10 * sizeof(float);  
    int height = 10 * sizeof(float);  
    size_t pitch;  
  
    cudaError err = cudaSuccess;  
  
    err = cudaMallocPitch(&pDeviceData, &pitch, width, height);     
    if (err != cudaSuccess)  
    {  
        cout << "call cudaMallocPitch fail!!!" << endl;  
        exit(1);  
    }  
    cout << "width: " << width << endl;  
    cout << "height: " << height << endl;  
    cout << "pitch: " << pitch << endl;  
  
    cudaFree(pDeviceData);  
    return 0;  
}  

3.cudaMalloc3D

int main()  
{  
    cudaError err = cudaSuccess;  
  
    cudaPitchedPtr pitchPtr;  
    cudaExtent extent;  
    extent.width = 10 * sizeof(float);  
    extent.height = 22 * sizeof(float);  
    extent.depth = 33 * sizeof(float);  
  
    err = cudaMalloc3D(&pitchPtr,extent);
    if (err != cudaSuccess)  
    {  
        cout << "call cudaMalloc3D fail!!!" << endl;  
        exit(1);  
    }  
    cout << "width: " << extent.width << endl;          
    cout << "height: " << extent.height << endl;  
    cout << "depth: " << extent.depth << endl;  
  
    cout << endl;  
    cout << "pitch: " << pitchPtr.pitch << endl;      
    cout << "xsize: " << pitchPtr.xsize << endl;     
    cout << "ysize: " << pitchPtr.ysize << endl;     
  
    cudaFree(pitchPtr.ptr);   
    return 0;  
}  

总结

内存分配函数有cudaMalloc、cudaMallocPitch、cudaMalloc3D分别分配一维、二维、三位内存空间。