auto-correlation Help required

Hey guys!! I’m new to cuda and having a problem with my code. The problem is that the code runs fine for a relatively smaller array size but if the array size is set to like 100000 i get an error that the device driver has stopped responding. I’ve a 8800GT. Any help would be highly appreciated.The code is as follows.

#include <cuda.h>
#include <stdio.h>
#include <cuda_runtime.h>
#include <conio.h>
#include “device_launch_parameters.h”
#include <synchronizationerrors.h>
#include

global void autocorr(int n,int *dev_array1,int *dev_array2){

int tid = threadIdx.x + blockIdx.x * blockDim.x;
int sum = 0;

if(tid<n){
for(int j=0;j<n-tid;j++)
{
	sum+= dev_array1[j] * dev_array1[j+tid];
}

dev_array2[tid] = sum;
tid += blockDim.x * gridDim.x;

}

}

int main(){

int n = 0;
int r;
int *array1; //host array 1.
int *array2; //host array 2.

int *dev_array1; //device array 1.
int *dev_array2; //device array 2.

printf("Enter no. of elements: "); 
scanf_s("%d",&n);
printf("\n\n");

array1 = (int *)malloc(n * sizeof (int)); 
array2 = (int *)malloc(n * sizeof (int)); 

cudaMalloc( (void**)&dev_array1, n * sizeof(int) ); 
cudaMalloc( (void**)&dev_array2, n * sizeof(int) ); 


for(int i=0;i<n;i++){ 

	array1[i] = i;
}

cudaMemcpy(dev_array1,array1,n * sizeof(int),cudaMemcpyHostToDevice); //copying elements of input array to device array.

autocorr<<<(n+499)/500,500>>>(n,dev_array1,dev_array2); //The number of threads(500) is just an arbitrary number.


cudaMemcpy(array2,dev_array2,n*sizeof(int),cudaMemcpyDeviceToHost);

printf("\nAutocorrelated array\n\n");
for(int i=0;i<n;i++){
	printf("\n%d",array2[i]);
}
_getch();
return 0;

}

This message indicates that your code has run too long and triggered the watchdog timer. Follow the link in my signature for details.

(BTW, code posted to the forums looks much nicer if included between [font=“Courier New”][code]…[/code][/font] tags)

Thank you very much for your help. About the naive way of posting code, its my first time posting a query on a forum so i didn’t know. Thanks for the advice.