In the Collector, the SET COUNTERS and SET COVERAGE commands
    require one or more nodespecs to specify the program locations at
    which to collect execution counts or coverage data. The following
    example specifies an execution counter on every routine in the
    entire program. Notice that it has two clauses. The first clause
    (PROGRAM_ADDRESS) specifies the range, and the second clause (BY
    ROUTINE) specifies the unit.
 PCAC> SET COUNTERS PROGRAM_ADDRESS BY ROUTINE

    In the Collector, only nodespecs in the program address domain,
    specifying routines, codepaths, or lines, can be used. See
    Program_Address_Domain in this HELP entry for valid forms of
    the nodespecs.