Professional CUDA C Programming Code Example 1.1

CUDA PROGRAM STRUCTURE
A typical CUDA program structure consists of fi ve main steps:
1. Allocate GPU memories.
2. Copy data from CPU memory to GPU memory.
3. Invoke the CUDA kernel to perform program-specifi c computation.
4. Copy data back from GPU memory to CPU memory.
5. Destroy GPU memories.
In the simple program hello.cu, you only see the third step: Invoke the kernel. For
the remainder of this book, examples will demonstrate each step in the CUDA program
structure.

A typical CUDA program structure consists of five main steps:

1 allocation GPU memory.

2. Copy the data from the CPU memory to the GPU memory. 

3. calls CUDA kernel execution program-specifi calculations.

4. copy the data from the GPU memory to the CPU memory. 

The destruction of GPU memory. 

. Hello in a simple program cu, you only see Step Three: Call the kernel. In the rest of the book, the program configuration example demonstrates CUDA each step.

#include <stdio.h>
#include"cuda_runtime.h"
__global__ void helloFromGPU(void)
{
    printf("Hello World from GPU!\n");
}
int main(void)
{
    // hello from cpu
    printf("Hello World from CPU!\n");
    helloFromGPU <<<10, 1 >>> ();
    cudaDeviceReset();
    return 0;
}