MONITOR(S) XENIX System V MONITOR(S)
Name
monitor - Prepares execution profile.
Syntax
void monitor(lowpc,highpc,buffer,bufsize,nfunc)
int (*lowpc)( ), (*highpc)( );
short *buffer;
int bufsize, nfunc;
Description
monitor is an interface to profil(S). lowpc and highpc are
the addresses of two functions; buffer is the address of a
user-supplied array of bufsize short integers. monitor
arranges to record a histogram of periodically sampled
values of the program counter, and of counts of calls of
certain functions, in the buffer. The lowest address
sampled is that of lowpc and the highest is just below
highpc. At most nfunc call counts can be kept; only calls
of functions compiled with the profiling option -p of cc(CP)
are recorded. For the results to be significant, especially
where there are small, heavily used routines, it is
suggested that the buffer be no more than a few times
smaller than the range of locations sampled.
To profile the entire program, it is sufficient to use
extern etext();
...
monitor((int (*)())2, etext, buf, bufsize, nfunc);
etext lies just above all the program text.
To stop execution monitoring and write the results on the
file mon.out, use
monitor((int (*)())0);
prof(CP) can then be used to examine the results.
Files
mon.out
See Also
cc(CP), prof(CP), profil(S)
Notes
An executable program created by cc -p automatically
includes calls for monitor with default parameters; monitor
needn't be called explicitly except to gain fine control
over profiling.
Warning
Page 1 (printed 8/7/87)
MONITOR(S) XENIX System V MONITOR(S)
Profiling gives incorrect results for hybrid model 286
programs (i.e. those with 16 bit text pointers within
modules and 32 bit text pointers between modules).
Page 2 (printed 8/7/87)