problem with "vector sum" example in "CUDA by example" book

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

I am trying to learn CUDA and reading one of the recommended book “CUDA by Example” by Sanders and Kandrot. In chapter 5, there is a vector addition example. Basically, the program takes in two vectors of certain length and finds the summation of the two.

The example by itself works fine but if I increase the number of elements in the vector, the program crashes.

The following works fine:

#define NUMBER_OF_ELEMENT (64*1024)

The following will crash:

#define NUMBER_OF_ELEMENT (128*1024)

I am also attaching the complete code.

I am trying the program on a XPS15 which has 525m 1GB memory. I think it is not limited by the memory size. Also, the example is designed to work with large vector size. So, what is wrong?

Thanks a lot for your time!
VectorSumUnlimited.cu (1.43 KB)

2

The sample program allocates the host arrays on the stack (instead of the heap), so perhaps the crash is the result of inadequate stack space. Try replacing this:

int a[NUMBER_OF_ELEMENT], b[NUMBER_OF_ELEMENT], c[NUMBER_OF_ELEMENT];

with something like this:

int* a = new int[NUMBER_OF_ELEMENT];

int* b = new int[NUMBER_OF_ELEMENT];

int* c = new int[NUMBER_OF_ELEMENT];

(rest of the code)

delete [] a;

delete [] b;

delete [] c;

Jeremy