PRF(7) (System Performance Analysis Utilities) PRF(7)
NAME
prf - operating system profiler
DESCRIPTION
The special file /dev/prf provides access to activity
information in the operating system. Writing the file loads
the measurement facility with text addresses to be
monitored. Reading the file returns these addresses and a
set of counters indicative of activity between adjacent text
addresses.
The recording mechanism is driven by the system clock and
samples the program counter at line frequency. Samples that
catch the operating system are matched against the stored
text addresses and increment corresponding counters for
later processing.
The file /dev/prf is a pseudo-device with no associated
hardware.
FILES
/dev/prf
SEE ALSO
profiler(1M).
Page 1 May 1989