MONCONTROL(3) BSD Library Functions Manual MONCONTROL(3)
NAME
moncontrol, monstartup -- control execution profile
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 histogram 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 par-ticular particular
ticular operations to be measured. Note that an output file will be produced on program exit regard-less regardless
less 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 exe-cution execution
cution time measured. Profiling begins on return from monstartup().
FILES
gmon.out execution data file
SEE ALSO
cc(1), gprof(1), profil(2)
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
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