MONCONTROL(3) | Library Functions Manual | MONCONTROL(3) |
moncontrol
, monstartup
—
moncontrol
(int
mode);
monstartup
(u_long
*lowpc, u_long
*highpc);
-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 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. 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 execution time measured. Profiling begins on return from
monstartup
().
PROFDIR
June 4, 1993 | NetBSD 9.2 |