测试gpu的加速比

#include<iostream>
#include<cuda.h>
#include<cuda_runtime.h>
#include<time.h>
#include<math.h>
using namespace std;


const int Num=10000000;
const int threads=256;
const int blocks=2048;


__global__ void kernel(int* a,int* b,int* c)
{
const int tid=blockIdx.x*blockDim.x+threadIdx.x;
for(long i=tid;i<Num+gridDim.x*blockDim.x;i+=gridDim.x*blockDim.x)
{
if(i<Num)
{
//a[i]=(int)sqrtf(b[i])%(int)sqrtf(c[i]); 
a[i]=b[i]%c[i]; 
}
}
}


int main(void)