关于随机数生成的速度测试

随机数生成有两种方法，一种是主机上生成拷贝到设备上，另一种是直接主机上调用，在设备上生成：下面就是关于这两种方法的速度测试：

int main(){

    clock_t start,finish;

    int *d_data;

    int m = 1000;

    CUDA_CALL(cudaMalloc((void **)&d_data, m*sizeof(int)));

    int rand1[1000];

    start = clock();

    

    memset(rand1,0,m*sizeof(int));

    for(int i=0;i<m;i++)

        rand1[i] = RAND::Rand(100);

    

    CUDA_CALL(cudaMemcpy(d_data,rand1,m*sizeof(int),cudaMemcpyHostToDevice));

    finish=clock();

    printf("%d--%d --- %d\n",start,finish,finish-start);



    clock_t start1,finish1;

    start1=clock();

    size_t n = 1000;

    size_t i;

    curandGenerator_t gen;

    float *devData;

    CUDA_CALL(cudaMalloc((void **)&devData, n*sizeof(float)));

    CURAND_CALL(curandCreateGenerator(&gen, CURAND_RNG_PSEUDO_DEFAULT));

    CURAND_CALL(curandSetPseudoRandomGeneratorSeed(gen, 1234));

    CURAND_CALL(curandGenerateUniform(gen, devData, n));



    CURAND_CALL(curandDestroyGenerator(gen));

   

    finish1=clock();

    printf("%d --- %d",finish1,finish1-start1);

     CUDA_CALL(cudaFree(devData));

    getchar();

    return 0;

}

速度测试结果：

1000000个点	1000个点
6	1
6	0
6	0

1000000个点	1000个点
85	87
85	83
84	83