FDS provides Fortran programmers with tools to aid debugging, including a interactive debugging routine for TSS (FDEBUG), routines to provide symbolic dumps of all your variables (FDUMP), a method that permits you to call your own routines when your program terminates (ATCALL and NTCALL), and a routine that displays how much time you spend in each section of your program (FTIMER).
FDS is already built into the system for you to use, including the symbol tables which enable FDS to identify your variables. The inclusion of the symbol tables has no effect on the speed at which your program runs, but it does increase the core requirements, depending on how many variables you have. To have the compiler produce symbol tables, use the FDS option on your $FORT77 card in batch, or use the +FDS option on the F77 command in TSS.
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