any good and simple RPC library for inter-process calls? [closed]

Answer 1

Boost.MPI. Simple, fast, scalable.

#include 
#include 
#include 
#include 
namespace mpi = boost::mpi;

int main(int argc, char* argv[]) 
{
  mpi::environment env(argc, argv);
  mpi::communicator world;

  std::stringstream ss;
  ss << "Hello, I am process " << world.rank() << " of " << world.size() << ".";

  world.send(1, 0, ss.str());
}