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-.TH MONITOR 3
-.CT 2 debug_tune
-.SH NAME
-monitor \(mi prepare execution profile
-.SH SYNOPSIS
-.nf
-.B monitor(lowpc, highpc, buffer, bufsize, nfunc)
-.B int (*lowpc)(), (*highpc)();
-.B short buffer[];
-.fi
-.SH DESCRIPTION
-An executable program created by
-.L
-cc -p
-automatically includes calls for
-.I monitor
-with default parameters;
-.I monitor
-needn't be called explicitly
-except to gain fine control over profiling.
-.PP
-.I Monitor
-is an interface to
-.IR profil (2).
-.I Lowpc
-and
-.I highpc
-are the addresses of two functions;
-.I buffer
-is the address of a (user supplied)
-array of
-.I bufsize
-bytes.
-.I 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
-.I lowpc
-and the highest is
-just below
-.IR highpc .
-At most
-.I nfunc
-call counts can be kept; only calls of functions
-compiled with the profiling option
-.B -p
-of
-.IR cc (1)
-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.
-The default values for
-.I bufsize
-and
-.I nfunc
-are
-(\f2highpc\fP\-\f2lowpc\fP)/8
-and 300 respectively.
-.PP
-To profile the entire program, use
-.PP
-.nf
-.ft L
-	extern etext();
-	. . .
-	monitor((int (*)())2, etext, buf, bufsize, nfunc);
-.ft P
-.fi
-.PP
-.I Etext
-lies just above all the
-program text, see
-.IR end (3).
-For the highest resolution profiling on the VAX, use
-.B
-bufsize = ((int)highpc)-((int)lowpc)+12+8*nfunc\fR.
-.PP
-To stop execution monitoring and write the results
-on the file
-.I mon.out,
-use
-.PP
-.L
-	monitor((int (*)())0);
-.LP
-then
-.IR prof (1)
-can be used
-to examine the results.
-.SH FILES
-.TP
-.F mon.out
-.SH "SEE ALSO"
-.IR prof (1), 
-.IR profil (2), 
-.IR cc (1)