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28 .\" @(#)moncontrol.3 8.1 (Berkeley) 6/4/93
37 .Nd control execution profile
44 .Fn moncontrol "int mode"
46 .Fn monstartup "u_long lowpc" "u_long highpc"
48 An executable program compiled using the
52 automatically includes calls to collect statistics for the
54 call-graph execution profiler.
55 In typical operation, profiling begins at program startup
56 and ends when the program calls exit.
57 When the program exits, the profiling data are written to the file
58 .Ar progname Ns Pa .gmon ,
59 where progname is the name of the program, then
61 can be used to examine the results.
66 selectively controls profiling within a program.
67 When the program starts, profiling begins.
68 To stop the collection of histogram ticks and call counts use
70 to resume the collection of histogram ticks and call counts use
72 This feature allows the cost of particular operations to be measured.
73 Note that an output file will be produced on program exit
74 regardless of the state of
77 Programs that are not loaded with
79 may selectively collect profiling statistics by calling
81 with the range of addresses to be profiled.
87 specify the address range that is to be sampled;
88 the lowest address sampled is that of
90 and the highest is just below
92 Only functions in that range that have been compiled with the
96 will appear in the call graph part of the output;
97 however, all functions in that address range will
98 have their execution time measured.
99 Profiling begins on return from
102 The following environment variables affect the execution of
104 .Bl -tag -width ".Ev PROFIL_USE_PID"
106 If set, the pid of the process is inserted into the filename.
109 .Bl -tag -width progname.gmon -compact