XL Fortran Enterprise Edition for AIX : User's Guide - IBM

-p Option
Syntax
-p[g]
Sets up the object file for profiling.
-p prepares the program for profiling. When you execute the program, it produces
a mon.out file with the profiling information. You can then use the prof command
to generate a run-time profile.
-pg is like -p, but it produces more extensive statistics. Running a program
compiled with -pg produces a gmon.out file, which you use with the gprof
command to generate a run-time profile.
Rules
For profiling, the compiler produces monitoring code that counts the number of
times each routine is called. The compiler replaces the startup routine of each
subprogram with one that calls the monitor subroutine at the start. When the
program ends normally, it writes the recorded information to the mon.out or
gmon.out file.
Examples
$ xlf95 -p needs_tuning.f
$ a.out
$ prof
.
.
.
profiling data
.
.
.
$ xlf95 -pg needs_tuning.f
$ a.out
$ gprof
.
.
.
detailed and verbose profiling data
.
.
.
Related Information
For more information on profiling and the prof and gprof commands, see the AIX
Commands Reference.
118 XL Fortran Enterprise Edition for AIX : User’s Guide