profiler(1M) profiler(1M)
NAME
profiler: prfld, prfstat, prfdc, prfsnap, prfpr - UNIX system
profiler
SYNOPSIS
/usr/sbin/prfld [ system_namelist ]
/usr/sbin/prfstat on
/usr/sbin/prfstat off
/usr/sbin/prfdc file [ period [ off_hour ] ]
/usr/sbin/prfsnap file
/usr/sbin/prfpr file [ cutoff [ system_namelist ] ]
DESCRIPTION
prfld, prfstat, prfdc, prfsnap, and prfpr form a system of programs
to facilitate an activity study of the UNIX operating system.
prfld 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.
prfstat 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.
prfdc and prfsnap 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.
prfpr 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
/stand/unix
default for system namelist file
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