constexpr bool io_verbose = true;

    if (io_verbose) {
      CCTK_VINFO("Silo output for groups:");
      for (int gi = 0; gi < CCTK_NumGroups(); ++gi) {
        if (group_enabled.at(gi)) {
          char *const groupname = CCTK_GroupName(gi);
          CCTK_VINFO("  %s", groupname);
          free(groupname);
        }
      }
    }