prf(7)                                                               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 adja-
     cent 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).

































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