CUDA 2D Array Problems

[Odc]

Hi all, I've posted this over at the Nvidia forums as well but thought I'd try my luck here too

Original Post:

I've just started to learn CUDA and have created a simple program that creates a 2D array of int, assigns the memory on the device and then copies the array onto the device. Eventually I want to expand this into a graph searching algorithm. However, when using an array with 1,000 verticies (indicies) it simply crashes. As far as I can tell, its populating the array on the host that causes the crash.

Call me a noob but I thought that an array of this size was perfectly acceptable?

Here's my code anyway

#include <stdio.h>
#include <cuda.h>

__global__ void myKernel(int* deviceArrayPtr, int pitch)
{

}

main()
{
int* deviceArrayPtr;
size_t devicePitch, hostPitch, width, height;
int hostArray[1000][1000];

width = 1000;
height = 1000;
for(int i = 0; i < 1000; i ++)
for(int j = 0; j < 1000; j ++)
hostArray[i][j] = 20; //20 is an abitrary number

//Allocates memory on the device
cudaMallocPitch((void**)&deviceArrayPtr, &devicePitch, width * sizeof(int), height);

hostPitch = devicePitch;

//Copies hostArray onto the pre-allocated device memory
cudaMemcpy2D(deviceArrayPtr, devicePitch, &hostArray, hostPitch, width * sizeof(int), height, cudaMemcpyHostToDevice);

myKernel <<< 100, 512 >>> (deviceArrayPtr, devicePitch);
}


Anyone have any ideas about this?

[aidanjt]

The array fill loop code is fine. It's likely your cuda calls which are the problem.