Wrong mpi number of processors

Question

Sorry, I\'m sure making a silly mistake, but did not work out.

I\'m compiling a simple mpi hello world:

#include 
#include 

         


        

Answer 1

I don't know how you can compile it:

 int main (argc, argv)
 int argc;
 char *argv[];

will be changed to

 int main (int argc, char *argv[])

another point is that mpi is message passing interface that passes messages between processes not cores or processors if you have a 4 core system you can run your code with so many processes as your ram permits but only 4 processes are working at any time and other processes must wait so it is efficient that you use only 4 process.