【Participate in CUDA online training camp】——experimental writing CUDA program

1. Write the first program Hello CUDA

Programs generally written in the CPU:

#include <stdio.h>

void hello_from_cpu()
{
    
    
    printf("Hello World from the CPU!\n");
}

int main(void)
{
    
    
    hello_from_cpu();
    return 0;
}

Program written using CUDA

#include <stdio.h>

__global__ void hello_from_gpu()
{
    
    
    printf("Hello World from the GPU!\n");
}

int main(void)
{
    
    
    hello_from_gpu<<<1, 1>>>();
    cudaDeviceSynchronize();
    return 0;
}

2. compile

After writing the program, start to compile two compilation methods

1.nvcc

nvcc -arch=compute_72 -code=sm_72 hello_cuda.cu -o hello_cuda -run

2.Makefile

Makefile contents:

TEST_SOURCE = hello_cuda.cu

TARGETBIN := ./hello_cuda

CC = /usr/local/cuda/bin/nvcc

$(TARGETBIN):$(TEST_SOURCE)
	$(CC)  $(TEST_SOURCE) -o $(TARGETBIN)

.PHONY:clean
clean:
	-rm -rf $(TARGETBIN)
	-rm -rf *.o

Command line input: make
Then generate an executable file
Then enter: ./hello_cuda
to run the file

Then use nvprof to view performance:

nvprof ./hello_cuda