mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
118 lines
3.8 KiB
Groff
118 lines
3.8 KiB
Groff
.\" Copyright (c) 1980, 1991, 1992, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)moncontrol.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 14, 2004
|
|
.Dt MONCONTROL 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm moncontrol ,
|
|
.Nm monstartup
|
|
.Nd control execution profile
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In sys/gmon.h
|
|
.Ft void
|
|
.Fn moncontrol "int mode"
|
|
.Ft void
|
|
.Fn monstartup "u_long lowpc" "u_long highpc"
|
|
.Sh DESCRIPTION
|
|
An executable program compiled using the
|
|
.Fl pg
|
|
option to
|
|
.Xr cc 1
|
|
automatically includes calls to collect statistics for the
|
|
.Xr 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
|
|
.Ar progname Ns Pa .gmon ,
|
|
where progname is the name of the program, then
|
|
.Xr gprof 1
|
|
can be used to examine the results.
|
|
.Pp
|
|
The
|
|
.Fn 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
|
|
.Fn moncontrol 0 ;
|
|
to resume the collection of histogram ticks and call counts use
|
|
.Fn 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
|
|
.Fn moncontrol .
|
|
.Pp
|
|
Programs that are not loaded with
|
|
.Fl pg
|
|
may selectively collect profiling statistics by calling
|
|
.Fn monstartup
|
|
with the range of addresses to be profiled.
|
|
The
|
|
.Fa lowpc
|
|
and
|
|
.Fa highpc
|
|
arguments
|
|
specify the address range that is to be sampled;
|
|
the lowest address sampled is that of
|
|
.Fa lowpc
|
|
and the highest is just below
|
|
.Fa highpc .
|
|
Only functions in that range that have been compiled with the
|
|
.Fl pg
|
|
option to
|
|
.Xr 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
|
|
.Fn monstartup .
|
|
.Sh ENVIRONMENT
|
|
The following environment variables affect the execution of
|
|
.Nm :
|
|
.Bl -tag -width ".Ev PROFIL_USE_PID"
|
|
.It PROFIL_USE_PID
|
|
If set, the pid of the process is inserted into the filename.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width progname.gmon -compact
|
|
.It Pa progname.gmon
|
|
execution data file
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr cc 1 ,
|
|
.Xr gprof 1 ,
|
|
.Xr profil 2 ,
|
|
.Xr clocks 7
|