The following are examples of pl_subcalls.d.

This is a simple script to count executed Perl subroutines. Here it traces
an example program, Code/Perl/func_abc.pl.

   # pl_subcalls.d 
   Tracing... Hit Ctrl-C to end.
   ^C
    FILE                             SUB                                 CALLS
    func_abc.pl                      func_a                                  1
    func_abc.pl                      func_b                                  1
    func_abc.pl                      func_c                                  1

While tracing, func_a() from the program "func_abc.pl" was executed once,
along with func_b() and func_c().



The following traces a Perl network interface statistics tool, "nicstat"
version 0.99,

   # pl_subcalls.d
   Tracing... Hit Ctrl-C to end.
   ^C
    FILE                             SUB                                 CALLS
    Config.pm                        DESTROY                                 1
    Config.pm                        TIEHASH                                 1
    Config.pm                        import                                  1
    DynaLoader.pm                    bootstrap                               1
    DynaLoader.pm                    dl_load_flags                           1
    Std.pm                           getopts                                 1
    nicstat                          fetch_net_data                          1
    nicstat                          find_nets                               1
    register.pm                      import                                  1
    warnings.pm                      BEGIN                                   1
    Config.pm                        BEGIN                                   2
    DynaLoader.pm                    BEGIN                                   2
    Exporter.pm                      import                                  2
    register.pm                      mkMask                                  2
    vars.pm                          import                                  2
    Kstat.pm                         BEGIN                                   3
    nicstat                          BEGIN                                   3
    vars.pm                          BEGIN                                   3
    Config.pm                        FETCH                                   4
    strict.pm                        unimport                                4
    strict.pm                        import                                  5
    AutoLoader.pm                    BEGIN                                   6
    strict.pm                        bits                                    6
    nicstat                          print_neat                             18

The number of subroutines called by nicstat can be seen above, which includes
subroutines from libraries and modules that the program used.