profiler

PURPOSE

     Profiles the operating system.

SYNOPSIS
     prfid [ kernel ]

     prfstat [ on off ]

     prfdc file [ minutes ] [ hour ]

     prfsnap file

     prfpr file [ cutoff ] [ kernel ]

DESCRIPTION

     With the  prfld, prfstat, prfdc, prfsnap,  and prfpr com-
     mands, you can examine the  activity of the AIX operating
     system.

       prfld

     Use prfld  to initialize  the recording mechanism  in the
     system.   It produces  a  table  containing the  starting
     address  of  each  system subroutine  as  extracted  from
     kernel-image.

       prfstat

     Use prfstat to enable  or disable the sampling mechanism.
     prfstat also  reveals the number of  text addresses being
     measured.

       prfdc, prfsnap

     Use prfdc and prfsnap to collect profiler data by copying
     the current value  of all the text address  counters to a
     file where  the data can  be analyzed.  prfdc  stores the
     counters into file every  specified minutes and turns off
     at hour  (0-24).  prfsnap  collects data  at the  time of
     invocation only, adding the counter values to file.

       prfpr

     Use  prfpr  to format  the  data  collected by  prfdc  or
     prfsnap.  It  converts each  text address to  the nearest
     text symbol (as found in kernel-image) and displays it if
     the  percent  activity for  that  range  is greater  than
     cutoff.

FILES

     /dev/prf    Interface to profile data and text addresses.
     /unix       System kernel image file.

RELATED INFORMATION

     The prf file in AIX Operating System Technical Reference.