PROF(7) Device and Network Interfaces PROF(7)


NAME


prof - profile within a function

SYNOPSIS


#define MARK
#include <prof.h>

void MARK(name);


DESCRIPTION


MARK introduces a mark called name that is treated the same as a
function entry point. Execution of the mark adds to a counter for that
mark, and program-counter time spent is accounted to the immediately
preceding mark or to the function if there are no preceding marks within
the active function.


name may be any combination of letters, numbers, or underscores. Each
name in a single compilation must be unique, but may be the same as any
ordinary program symbol.


For marks to be effective, the symbol MARK must be defined before the
header prof.h is included, either by a preprocessor directive as in the
synopsis, or by a command line argument:


cc -p -DMARK work.c


If MARK is not defined, the MARK(name) statements may be left in the
source files containing them and are ignored. prof -g must be used to
get information on all labels.

EXAMPLES


In this example, marks can be used to determine how much time is spent in
each loop. Unless this example is compiled with MARK defined on the
command line, the marks are ignored.

#include <prof.h>
work( )
{
int i, j;
...
MARK(loop1);
for (i = 0; i < 2000; i++) {
...
}
MARK(loop2);
for (j = 0; j < 2000; j++) {
...
}
}


SEE ALSO


profil(2), monitor(3C)


July 3, 1990 PROF(7)