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LEARN ABOUT NETBSD

monstartup

MONCONTROL(3)						   BSD Library Functions Manual 					     MONCONTROL(3)

NAME

     moncontrol, monstartup -- control execution profile

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     moncontrol(int mode);

     monstartup(u_long *lowpc, u_long *highpc);

DESCRIPTION

     An executable program compiled using the -pg option to cc(1) automatically includes calls to collect statistics for the gprof(1) call-graph
     execution profiler.  In typical operation, profiling begins at program startup and ends when the program calls exit.  When the program exits,
     the profiling data are written to the file gmon.out, then gprof(1) can be used to examine the results.

     moncontrol() selectively controls profiling within a program.  When the program starts, profiling begins.	To stop the collection of his-
     togram ticks and call counts use moncontrol(0); to resume the collection of histogram ticks and call counts use moncontrol(1).  This feature
     allows the cost of particular operations to be measured.  Note that an output file will be produced on program exit regardless of the state
     of moncontrol().

     Programs that are not loaded with -pg may selectively collect profiling statistics by calling monstartup() with the range of addresses to be
     profiled.	lowpc and highpc specify the address range that is to be sampled; the lowest address sampled is that of lowpc and the highest is
     just below highpc.  Only functions in that range that have been compiled with the -pg option to cc(1) will appear in the call graph part of
     the output; however, all functions in that address range will have their execution time measured.	Profiling begins on return from
     monstartup().

ENVIRONMENT

     PROFDIR  Directory to place the output file(s) in.  When this is set, instead of writing the profiling output to gmon.out, a filename is gen-
	      erated from the process id and name of the program (e.g., 123.a.out).  If you are profiling a program that forks, or otherwise cre-
	      ates multiple copies, setting this is the only reasonable way to get all profiling data.

FILES

     gmon.out  execution data file

SEE ALSO

     cc(1), gprof(1), profil(2)

BSD
								   June 4, 1993 							       BSD

UNIX for Advanced & Expert Users