NAME
moncontrol,
monstartup —
control execution profile
LIBRARY
library “libc”
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) 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
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 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 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. The lowpc
and highpc arguments 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().
FILES
- progname.gmon
- execution data file