Why does MPI_Init accept pointers to argc and argv?

Question

this is how we use MPI_Init function

int main(int argc, char **argv)
{
    MPI_Init(&argc, &argv);
…
}

why does MPI_Init use pointe

Answer 1

I'm not an expert but I believe the simple answer is that each node that you're working with is working with its own copy of the code. Passing these arguments allows each of the nodes to have access to argc and argv even though they were not passed them through the command line interface. The original or master node that calls MPI_Init is passed these arguments. MPI_Init allows the other nodes to access them as well.