DragonFly On-Line Manual Pages


MONCONTROL(3)	      DragonFly Library Functions Manual	 MONCONTROL(3)

NAME

moncontrol, monstartup -- control execution profile

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/types.h> #include <sys/gmon.h> void moncontrol(int mode); void monstartup(u_long lowpc, u_long highpc);

DESCRIPTION

An executable program compiled using the -pg option to cc(1) automati- cally 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 progname.gmon, where progname is the name of the program, then gprof(1) can be used to examine the results. The moncontrol() function selectively controls profiling within a pro- gram. When the program starts, profiling begins. To stop the collection of histogram ticks and call counts use moncontrol(0); to resume the col- lection of histogram ticks and call counts use moncontrol(1). This fea- ture 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 pro- filed. The lowpc and highpc arguments specify the address range that is to be sampled; the lowest address sampled is that of lowpc and the high- est 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().

FILES

progname.gmon execution data file

SEE ALSO

cc(1), gprof(1), profil(2), clocks(7) DragonFly 3.9 June 14, 2004 DragonFly 3.9