Fortran on the U-System

• PATH to executables and man pages are set in system files
• Make sure that fortran executables are in your path:
  set path=($path /opt/SUNWspro/bin)
• Man pages for fortran are located in /opt/SUNWspro/man so make sure that your MANPATH variable points to this place.
• The command to compile Fortran 77 programs is f77. Some of the most used options strongly suggested are:
  1. -C Check array references for out of range subscripts.
  2. -fast To optimize the code
  3. -O, -O2, -O3, -O4, -O5 Options to optimize codes. Be carefull with -O5 because it may slow the execution of the whole code.
  4. -g compile for debugging
  5. -xtarget=ultra... specify the system for optimization
• Here is an example:
  f77 -xtarget=ultra -xarch=v9 -fns -xO4 -fsimple=2 -stackvar -c agtrnx.f

  In this example the options used are:

  • -xtarget indicates that the system being used is an Ultra
  • -xarch specifies the target architecture instruction set.
  • v9 indicates that the code is compiled using 64 bit architecture.
  • -fns uses the Sparc nonstandard floating-point mode rather thann the standard.
  • -xO4 Level of optimization. This option is suggested for all codes. Same as -O4
  • -fsimple select floating-point optimization preference
  • -stackvar Force all local variables to be allocated on the stack.
  • -c do not link or produce an executable

Take a look at the f77 and f95/f90 manual pages.

No parallel processing will be allowed on the U-System machines. If your application needs parallel processing please use Super .