PROF(1)                                                   PROF(1)

     NAME
          prof, kprof - display profiling data

     SYNOPSIS
          prof [ -dr ] [ program ] [ profile ]

          kprof kernel kpdata

     DESCRIPTION
          Prof interprets files produced automatically by programs
          loaded using the -p option of 2l(1) or other loader.  The
          symbol table in the named program file (`v.out' by default)
          is read and correlated with the profile file (`prof.out' by
          default).  For each symbol, the percentage of time (in sec-
          onds) spent executing between that symbol and the next is
          printed (in decreasing order), together with the time spent
          there and the number of times that routine was called.

          Under option -d, prof prints the dynamic call graph of the
          target program, annotating the calls with the time spent in
          each routine and those it calls, recursively.  The output is
          indented two spaces for each call, and is formatted as
               symbol:time/ncall
          where symbol is the entry point of the call, time is in mil-
          liseconds, and ncall is the number of times that entry point
          was called at that point in the call graph.  If ncall is
          one, the /ncall is elided.  Normally recursive calls are
          compressed to keep the output brief; option -r prints the
          full call graph.

          The size of the buffer in program used to hold the profiling
          data, by default 2000 entries, may be controlled by setting
          the environment variable profsize before running program. If
          the buffer fills, subsequent function calls may not be
          recorded.

          Kprof is similar to prof, but presents the data accumulated
          by the kernel profiling device, kprof(3).  The symbol table
          file, that of the operating system kernel, and the data
          file, typically /dev/kpdata, must be provided.  Kprof has no
          options and cannot present dynamic data.

     SOURCE
          /sys/src/cmd/prof.c
          /sys/src/cmd/kprof.c

     SEE ALSO
          2l(1), kprof(3)