When I learned CUDA, I found that just about every tutorial and course starts with something that they call "Hello World". But, usually, that was not a "Hello World" program at all! "Hello world!" in Cuda should produce a string identical to "Hello World!", it should not print several strings, and it should not do other irrelevant things!
The problem with "Hello World!" for CUDA is simply this: You can't just printf("Hello World!\n"), because then you are not running any CUDA at all it would just be a C example, "Hello World!" for CUDA must do something in parallel, with a kernel run in the GPU. Here is my version: It takes the string "Hello ", and sends that sequel as an array (15, 10, 6, 0, -11, 1) to the kernel. The kernel adds the array elements to a string, which produces the array "World!". This string is passed back to the host and printed out.
Simple, parallel, relevant, and the output is Hello World!
To compile the program, use nvcc:
nvcc HelloCuda.cu -o HelloCudaTo run the compiled program, execute:
./HelloCudaMake sure you have NVIDIA CUDA Toolkit installed on your system to compile CUDA programs.