Find the optimal Parallel configuration.

def find_optconf(self, pconfs):
        """Find the optimal Parallel configuration."""
        # Save pconfs for future reference.
        self.set_pconfs(pconfs)

        # Select the partition on which we'll be running and set MPI/OMP cores.
        optconf = self.manager.select_qadapter(pconfs)
        return optconf