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5584f22bb3
the executable file, so it will work for both a.out and ELF format files. I have split the object format specific code into separate source files. It's cleaner than it was before, but it's still pretty crufty. Don't cheat on your make world for this update. A lot of things have to be rebuilt for it to work, including the compiler and all of the profiled libraries.
301 lines
9.0 KiB
Groff
301 lines
9.0 KiB
Groff
.\" Copyright (c) 1983, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)gprof.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd June 6, 1993
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.Dt GPROF 1
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.Os BSD 4.2
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.Sh NAME
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.Nm gprof
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.Nd display call graph profile data
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.Sh SYNOPSIS
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.Nm gprof
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.Op options
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.Op Ar a.out Op Ar gmon.out ...
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.Sh DESCRIPTION
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.Nm Gprof
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produces an execution profile of C, Pascal, or Fortran77 programs.
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The effect of called routines is incorporated in the profile of each caller.
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The profile data is taken from the call graph profile file
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.Pf ( Pa gmon.out
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default) which is created by programs
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that are compiled with the
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.Fl pg
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option of
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.Xr cc 1 ,
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.Xr pc 1 ,
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and
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.Xr f77 1 .
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The
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.Fl pg
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option also links in versions of the library routines
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that are compiled for profiling.
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.Nm Gprof
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reads the given object file (the default is
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.Pa a.out)
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and establishes the relation between it's symbol table
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and the call graph profile from
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.Pa gmon.out .
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If more than one profile file is specified,
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the
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.Nm gprof
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output shows the sum of the profile information in the given profile files.
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.Pp
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.Nm Gprof
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calculates the amount of time spent in each routine.
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Next, these times are propagated along the edges of the call graph.
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Cycles are discovered, and calls into a cycle are made to share the time
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of the cycle.
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The first listing shows the functions
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sorted according to the time they represent
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including the time of their call graph descendents.
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Below each function entry is shown its (direct) call graph children,
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and how their times are propagated to this function.
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A similar display above the function shows how this function's time and the
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time of its descendents is propagated to its (direct) call graph parents.
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.Pp
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Cycles are also shown, with an entry for the cycle as a whole and
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a listing of the members of the cycle and their contributions to the
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time and call counts of the cycle.
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.Pp
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Second, a flat profile is given,
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similar to that provided by
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.Xr prof 1 .
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This listing gives the total execution times, the call counts,
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the time in msec or usec the call spent in the routine itself, and
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the time in msec or usec the call spent in the routine itself including
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its descendents.
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.Pp
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Finally, an index of the function names is provided.
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.Pp
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The following options are available:
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.Bl -tag -width Fl
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.It Fl a
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Suppresses the printing of statically declared functions.
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If this option is given, all relevant information about the static function
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(e.g., time samples, calls to other functions, calls from other functions)
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belongs to the function loaded just before the static function in the
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.Pa a.out
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file.
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.It Fl b
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Suppresses the printing of a description of each field in the profile.
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.It Fl c
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The static call graph of the program is discovered by a heuristic
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that examines the text space of the object file.
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Static-only parents or children are shown
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with call counts of 0.
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This option is not supported on some architectures.
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.It Fl C Ar count
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Find a minimal set of arcs that can be broken to eliminate all cycles with
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.Ar count
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or more members.
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Caution: the algorithm used to break cycles is exponential,
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so using this option may cause
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.Nm gprof
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to run for a very long time.
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.It Fl e Ar name
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Suppresses the printing of the graph profile entry for routine
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.Ar name
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and all its descendants
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(unless they have other ancestors that aren't suppressed).
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More than one
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.Fl e
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option may be given.
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Only one
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.Ar name
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may be given with each
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.Fl e
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option.
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.It Fl E Ar name
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Suppresses the printing of the graph profile entry for routine
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.Ar name
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(and its descendants) as
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.Fl e ,
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above, and also excludes the time spent in
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.Ar name
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(and its descendants) from the total and percentage time computations.
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(For example,
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.Fl E
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.Ar mcount
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.Fl E
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.Ar mcleanup
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is the default.)
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.It Fl f Ar name
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Prints the graph profile entry of only the specified routine
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.Ar name
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and its descendants.
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More than one
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.Fl f
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option may be given.
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Only one
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.Ar name
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may be given with each
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.Fl f
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option.
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.It Fl F Ar name
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Prints the graph profile entry of only the routine
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.Ar name
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and its descendants (as
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.Fl f ,
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above) and also uses only the times of the printed routines
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in total time and percentage computations.
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More than one
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.Fl F
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option may be given.
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Only one
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.Ar name
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may be given with each
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.Fl F
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option.
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The
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.Fl F
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option
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overrides
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the
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.Fl E
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option.
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.It Fl k Ar fromname Ar toname
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Will delete any arcs from routine
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.Ar fromname
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to routine
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.Ar toname .
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This can be used to break undesired cycles.
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More than one
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.Fl k
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option may be given.
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Only one pair of routine names may be given with each
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.Fl k
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option.
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.It Fl l
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Suppresses the printing of the call-graph profile.
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.It Fl L
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Suppresses the printing of the flat profile.
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.It Fl s
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A profile file
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.Pa gmon.sum
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is produced that represents
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the sum of the profile information in all the specified profile files.
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This summary profile file may be given to later
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executions of gprof (probably also with a
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.Fl s )
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to accumulate profile data across several runs of an
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.Pa a.out
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file.
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.It Fl u
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Suppresses the printing of functions whose names are not visible to
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C programs. For the ELF object format, this means names that
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contain the
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.Ql \&.
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character. For the a.out object format, it means names that do not
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begin with a
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.Ql _
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character.
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All relevant information about such functions belongs to the
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(non-suppressed) function with the next lowest address.
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This is useful for eliminating "functions" that are just labels
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inside other functions.
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.It Fl z
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Displays routines that have zero usage (as shown by call counts
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and accumulated time).
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This is useful with the
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.Fl c
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option for discovering which routines were never called.
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.El
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.Sh FILES
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.Bl -tag -width gmon.sum -compact
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.It Pa a.out
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The namelist and text space.
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.It Pa gmon.out
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Dynamic call graph and profile.
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.It Pa gmon.sum
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Summarized dynamic call graph and profile.
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.El
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.Sh SEE ALSO
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.Xr cc 1 ,
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.Xr profil 2 ,
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.Xr clocks 7
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.\" .Xr monitor 3 ,
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.\" .Xr prof 1
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.Rs
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.%T "An Execution Profiler for Modular Programs"
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.%A S. Graham
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.%A P. Kessler
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.%A M. McKusick
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.%J "Software - Practice and Experience"
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.%V 13
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.%P pp. 671-685
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.%D 1983
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.Re
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.Rs
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.%T "gprof: A Call Graph Execution Profiler"
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.%A S. Graham
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.%A P. Kessler
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.%A M. McKusick
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.%J "Proceedings of the SIGPLAN '82 Symposium on Compiler Construction, SIGPLAN Notices"
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.%V 17
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.%N 6
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.%P pp. 120-126
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.%D June 1982
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.Re
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.Sh HISTORY
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The
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.Nm gprof
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profiler
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appeared in
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.Bx 4.2 .
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.Sh BUGS
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The granularity of the sampling is shown, but remains
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statistical at best.
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We assume that the time for each execution of a function
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can be expressed by the total time for the function divided
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by the number of times the function is called.
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Thus the time propagated along the call graph arcs to the function's
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parents is directly proportional to the number of times that
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arc is traversed.
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.Pp
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Parents that are not themselves profiled will have the time of
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their profiled children propagated to them, but they will appear
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to be spontaneously invoked in the call graph listing, and will
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not have their time propagated further.
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Similarly, signal catchers, even though profiled, will appear
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to be spontaneous (although for more obscure reasons).
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Any profiled children of signal catchers should have their times
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propagated properly, unless the signal catcher was invoked during
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the execution of the profiling routine, in which case all is lost.
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.Pp
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The profiled program must call
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.Xr exit 3
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or return normally for the profiling information to be saved
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in the
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.Pa gmon.out
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file.
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