PROF(1) 						      General Commands Manual							   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 by default) is read and correlated with the profile file 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 milliseconds, 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)

																	   PROF(1)