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30 .\" @(#)moncontrol.3 8.1 (Berkeley) 6/4/93
38 .Nd control execution profile
42 .Fn moncontrol "int mode"
43 .Fn monstartup "u_long *lowpc" "u_long *highpc"
45 An executable program compiled using the
49 automatically includes calls to collect statistics for the
51 call-graph execution profiler.
52 In typical operation, profiling begins at program startup
53 and ends when the program calls exit.
54 When the program exits, the profiling data are written to the file
58 can be used to examine the results.
61 selectively controls profiling within a program.
62 When the program starts, profiling begins.
63 To stop the collection of histogram ticks and call counts use
65 to resume the collection of histogram ticks and call counts use
67 This feature allows the cost of particular operations to be measured.
68 Note that an output file will be produced on program exit
69 regardless of the state of
72 Programs that are not loaded with
74 may selectively collect profiling statistics by calling
76 with the range of addresses to be profiled.
80 specify the address range that is to be sampled;
81 the lowest address sampled is that of
83 and the highest is just below
85 Only functions in that range that have been compiled with the
89 will appear in the call graph part of the output;
90 however, all functions in that address range will
91 have their execution time measured.
92 Profiling begins on return from
95 .Bl -tag -width "PROFDIR"
97 Directory to place the output file(s) in.
98 When this is set, instead of writing the profiling output to
100 a filename is generated from the process id and name of the program
103 If you are profiling a program that forks,
104 or otherwise creates multiple copies,
105 setting this is the only reasonable way to get all profiling data.
108 .Bl -tag -width ".Pa gmon.out" -compact