PROFILER(ADM) UNIX System V
Name
profiler: prfld, prfstat, prfdc, prfsnap, prfpr - UNIX
system profiler
Syntax
/etc/prfld [ system_namelist ]
/etc/prfstat on
/etc/prfstat off
/etc/prfdc file [ period [ off_hour ] ]
/etc/prfsnap file
/etc/prfpr file [ cutoff [ system_namelist ] ]
Description
The prfld, prfstat, prfdc, prfsnap, and prfpr routines form
a system of programs to facilitate an activity study of the
operating system.
The prfld program is used to initialize the recording
mechanism in the system. It generates a table containing
the starting address of each system subroutine as extracted
from system_namelist.
The prfstat program is used to enable or disable the
sampling mechanism. Profiler overhead is less than 1% as
calculated for 500 text addresses. Prfstat will also reveal
the number of text addresses being measured.
The prfdc and prfsnap programs perform the data collection
function of the profiler by copying the current value of all
the text address counters to a file where the data can be
analyzed. Prfdc will store the counters into file every
period minutes and will turn off at off_hour (valid values
for off_hour are 0-24). Prfsnap collects data at the time
of invocation only, appending the counter values to file.
The prfpr program formats the data collected by prfdc or
prfsnap. Each text address is converted to the nearest text
symbol (as found in system_namelist) and is printed if the
percent activity for that range is greater than cutoff.
Files
/dev/prf interface to profile data and text addresses
/unix default for system namelist file
(printed 2/15/90) PROFILER(ADM)