Using the PATHFILE option

If you want to capture the PATH information for more detailed analysis, you can specify the PATHFILE option rather than PATH. When you leave IDF, this information is saved in a file:

On CMS, the file "ASM PATHDATA A1" is written to disk.
On z/OS, data is written to the data set pointed to by the "PATHDATA" DD statement.
On z/VSE, data is written to SYSLST.

The columns in this file are, from left to right:

Execution count
Absolute memory address of the instruction
Name of the module containing the address
Address of the instruction within the module (offset)
Symbolic name of the instruction

If you plan to use this option, make sure you have plenty of free disk space. Also be aware that each instruction needs eight bytes of free storage, plus 20 bytes of control information for every 64K block of information.