message: handle both cases
diff: @@ -134,14 +134,16 @@ namespace cmdstan {
  info();
  #ifdef STAN_THREADS
  -#ifndef STAN_MPI
  std::stringstream msg_threads;
  +#ifndef STAN_MPI
  msg_threads << "Threading is enabled. map_rect will run with at most ";
  +#else
  + msg_threads << "MPI and threading is enabled. Nested map_rect will run with at most ";
  +#endif
  msg_threads << stan::math::internal::get_num_threads();
  msg_threads << " thread(s)." << std::endl;
  info(msg_threads.str());
  #endif
  -#endif
  #ifdef STAN_OPENCL
  std::stringstream msg_opencl;
  