The options controlling advanced PGO optimizations are:
Use the -prof_dirdirname option to specify the directory in which you intend to place the dynamic information (.dyn) files to be created. The default is the directory where the program is compiled. The specified directory must already exist.
You should specify -prof_dirdirname option with the same directory name for both the instrumentation and feedback compilations. If you move the .dyn files, you need to specify the new path.
The -prof_filefilename option specifies file name for profiling summary file.
When you use PGO, consider the following guidelines:
Minimize the changes to your program after instrumented execution and before feedback compilation. During feedback compilation, the compiler ignores dynamic information for functions modified after that information was generated.
The compiler issues a warning that the dynamic information does not correspond to a modified function.
Repeat the instrumentation compilation if you make many changes to your source files after execution and before feedback compilation.
Specify the name of the profile summary file using the -prof_filefilename option
See PGO Environment Variables.