\input texinfo @c -*-texinfo-*-
@setfilename gprof.info
-@c Copyright 1988, 1992, 1993, 1998, 1999, 2000, 2001, 2002, 2003,
-@c 2004, 2007
-@c Free Software Foundation, Inc.
+@c Copyright (C) 1988-2016 Free Software Foundation, Inc.
@settitle GNU gprof
@setchapternewpage odd
@include bfdver.texi
@c man end
-@ifinfo
+@ifnottex
@c This is a dir.info fragment to support semi-automated addition of
@c manuals to an info tree. zoo@cygnus.com is developing this facility.
-@format
-START-INFO-DIR-ENTRY
+@dircategory Software development
+@direntry
* gprof: (gprof). Profiling your program's execution
-END-INFO-DIR-ENTRY
-@end format
-@end ifinfo
+@end direntry
+@end ifnottex
@copying
This file documents the gprof profiler of the GNU system.
@c man begin COPYRIGHT
-Copyright @copyright{} 1988, 92, 97, 98, 99, 2000, 2001, 2003, 2007 Free Software Foundation, Inc.
+Copyright @copyright{} 1988-2016 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.1
+under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts. A copy of the license is included in the
@titlepage
@title GNU gprof
-@subtitle The @sc{gnu} Profiler
+@subtitle The @sc{gnu} Profiler
@ifset VERSION_PACKAGE
@subtitle @value{VERSION_PACKAGE}
@end ifset
Eric S. Raymond made some minor corrections and additions in 2003.
@vskip 0pt plus 1filll
-Copyright @copyright{} 1988, 92, 97, 98, 99, 2000, 2003 Free Software Foundation, Inc.
+Copyright @copyright{} 1988-2016 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
- under the terms of the GNU Free Documentation License, Version 1.1
+ under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts. A copy of the license is included in the
version @value{VERSION}.
This document is distributed under the terms of the GNU Free
-Documentation License. A copy of the license is included in the
-section entitled ``GNU Free Documentation License''.
+Documentation License version 1.3. A copy of the license is included
+in the section entitled ``GNU Free Documentation License''.
@menu
* Introduction:: What profiling means, and why it is useful.
@smallexample
@c man begin SYNOPSIS
-gprof [ -[abcDhilLrsTvwxyz] ] [ -[ACeEfFJnNOpPqQZ][@var{name}] ]
+gprof [ -[abcDhilLrsTvwxyz] ] [ -[ACeEfFJnNOpPqQZ][@var{name}] ]
[ -I @var{dirs} ] [ -d[@var{num}] ] [ -k @var{from/to} ]
[ -m @var{min-count} ] [ -R @var{map_file} ] [ -t @var{table-length} ]
- [ --[no-]annotated-source[=@var{name}] ]
+ [ --[no-]annotated-source[=@var{name}] ]
[ --[no-]exec-counts[=@var{name}] ]
[ --[no-]flat-profile[=@var{name}] ] [ --[no-]graph[=@var{name}] ]
- [ --[no-]time=@var{name}] [ --all-lines ] [ --brief ]
- [ --debug[=@var{level}] ] [ --function-ordering ]
+ [ --[no-]time=@var{name}] [ --all-lines ] [ --brief ]
+ [ --debug[=@var{level}] ] [ --function-ordering ]
[ --file-ordering @var{map_file} ] [ --directory-path=@var{dirs} ]
[ --display-unused-functions ] [ --file-format=@var{name} ]
- [ --file-info ] [ --help ] [ --line ] [ --min-count=@var{n} ]
- [ --no-static ] [ --print-path ] [ --separate-files ]
- [ --static-call-graph ] [ --sum ] [ --table-length=@var{len} ]
- [ --traditional ] [ --version ] [ --width=@var{n} ]
- [ --ignore-non-functions ] [ --demangle[=@var{STYLE}] ]
- [ --no-demangle ] [ @var{image-file} ] [ @var{profile-file} @dots{} ]
+ [ --file-info ] [ --help ] [ --line ] [ --inline-file-names ]
+ [ --min-count=@var{n} ] [ --no-static ] [ --print-path ]
+ [ --separate-files ] [ --static-call-graph ] [ --sum ]
+ [ --table-length=@var{len} ] [ --traditional ] [ --version ]
+ [ --width=@var{n} ] [ --ignore-non-functions ]
+ [ --demangle[=@var{STYLE}] ] [ --no-demangle ]
+ [--external-symbol-table=name]
+ [ @var{image-file} ] [ @var{profile-file} @dots{} ]
@c man end
@end smallexample
@c man begin DESCRIPTION
-@code{gprof} produces an execution profile of C, Pascal, or Fortran77
-programs. The effect of called routines is incorporated in the profile
+@code{gprof} produces an execution profile of C, Pascal, or Fortran77
+programs. The effect of called routines is incorporated in the profile
of each caller. The profile data is taken from the call graph profile file
(@file{gmon.out} default) which is created by programs
that are compiled with the @samp{-pg} option of
@code{cc}, @code{pc}, and @code{f77}.
The @samp{-pg} option also links in versions of the library routines
-that are compiled for profiling. @code{Gprof} reads the given object
+that are compiled for profiling. @code{Gprof} reads the given object
file (the default is @code{a.out}) and establishes the relation between
its symbol table and the call graph profile from @file{gmon.out}.
If more than one profile file is specified, the @code{gprof}
@item @file{gmon.out}
dynamic call graph and profile.
@item @file{gmon.sum}
-summarized dynamic call graph and profile.
+summarized dynamic call graph and profile.
@end table
@c man end
Flat profile:
Each sample counts as 0.01 seconds.
- % cumulative self self total
- time seconds seconds calls Ts/call Ts/call name
+ % cumulative self self total
+ time seconds seconds calls Ts/call Ts/call name
44.12 0.07 0.07 zazLoop
35.29 0.14 0.06 main
20.59 0.17 0.04 bazMillion
ld -o myprog /lib/gcrt0.o myprog.o utils.o -lc_p
@end example
+If you are running the program on a system which supports shared
+libraries you may run into problems with the profiling support code in
+a shared library being called before that library has been fully
+initialised. This is usually detected by the program encountering a
+segmentation fault as soon as it is run. The solution is to link
+against a static version of the library containing the profiling
+support code, which for @code{gcc} users can be done via the
+@samp{-static} or @samp{-static-libgcc} command line option. For
+example:
+
+@example
+gcc -g -pg -static-libgcc myprog.c utils.c -o myprog
+@end example
+
If you compile only some of the modules of the program with @samp{-pg}, you
can still profile the program, but you won't get complete information about
the modules that were compiled without @samp{-pg}. The only information
@itemx --no-demangle
These options control whether C++ symbol names should be demangled when
printing output. The default is to demangle symbols. The
-@code{--no-demangle} option may be used to turn off demangling. Different
-compilers have different mangling styles. The optional demangling style
-argument can be used to choose an appropriate demangling style for your
+@code{--no-demangle} option may be used to turn off demangling. Different
+compilers have different mangling styles. The optional demangling style
+argument can be used to choose an appropriate demangling style for your
compiler.
@end table
file/function/block where they were defined.) Time spent in these
functions, calls to/from them, etc., will all be attributed to the
function that was loaded directly before it in the executable file.
-@c This is compatible with Unix @code{gprof}, but a bad idea.
+@c This is compatible with Unix @code{gprof}, but a bad idea.
This option affects both the flat profile and the call graph.
@item -c
inaccuracies.
@xref{Sampling Error, ,Statistical Sampling Error}.
+@item --inline-file-names
+This option causes @code{gprof} to print the source file after each
+symbol in both the flat profile and the call graph. The full path to the
+file is printed if used with the @samp{-L} option.
+
@item -m @var{num}
@itemx --min-count=@var{num}
This option affects execution count output only.
The @samp{-n} option causes @code{gprof}, in its call graph analysis,
not to propagate times for symbols matching @var{symspec}.
+@item -S@var{filename}
+@itemx --external-symbol-table=@var{filename}
+The @samp{-S} option causes @code{gprof} to read an external symbol table
+file, such as @file{/proc/kallsyms}, rather than read the symbol table
+from the given object file (the default is @code{a.out}). This is useful
+for profiling kernel modules.
+
@item -z
@itemx --display-unused-functions
If you give the @samp{-z} option, @code{gprof} will mention all
@node Deprecated Options
@section Deprecated Options
-@table @code
-
These options have been replaced with newer versions that use symspecs.
+@table @code
+
@item -e @var{function_name}
The @samp{-e @var{function}} option tells @code{gprof} to not print
information about the function @var{function_name} (and its
as a child of any functions that call it, but its index number will be
shown as @samp{[not printed]}. More than one @samp{-e} option may be
given; only one @var{function_name} may be indicated with each @samp{-e}
-option.
+option.
@item -E @var{function_name}
The @code{-E @var{function}} option works like the @code{-e} option, but
call graph to the function @var{function_name} and its children (and
their children@dots{}). More than one @samp{-f} option may be given;
only one @var{function_name} may be indicated with each @samp{-f}
-option.
+option.
@item -F @var{function_name}
The @samp{-F @var{function}} option works like the @code{-f} option, but
Flat profile:
Each sample counts as 0.01 seconds.
- % cumulative self self total
- time seconds seconds calls ms/call ms/call name
+ % cumulative self self total
+ time seconds seconds calls ms/call ms/call name
33.34 0.02 0.02 7208 0.00 0.00 open
16.67 0.03 0.01 244 0.04 0.12 offtime
16.67 0.04 0.01 8 1.25 1.25 memccpy
The entries are sorted by time spent in the function and its subroutines.
-The internal profiling function @code{mcount} (@pxref{Flat Profile, ,The
+The internal profiling function @code{mcount} (@pxref{Flat Profile, ,The
Flat Profile}) is never mentioned in the call graph.
@menu
Flat profile:
Each sample counts as 0.01 seconds.
- % cumulative self self total
- time seconds seconds calls us/call us/call name
+ % cumulative self self total
+ time seconds seconds calls us/call us/call name
30.77 0.13 0.04 6335 6.31 6.31 ct_init
Flat profile:
Each sample counts as 0.01 seconds.
- % cumulative self
- time seconds seconds calls name
+ % cumulative self
+ time seconds seconds calls name
7.69 0.10 0.01 ct_init (trees.c:349)
7.69 0.11 0.01 ct_init (trees.c:351)
7.69 0.12 0.01 ct_init (trees.c:382)
unsigned n;
2 ->@{
register ulg c;
-
+
static ulg crc = (ulg)0xffffffffL;
-
+
2 -> if (s == NULL) @{
1 -> c = 0xffffffffL;
1 -> @} else @{
ought to catch that function in the act only once, there is a pretty good
chance it will actually find that function zero times, or twice.
-By contrast, the number-of-calls and basic-block figures
-are derived by counting, not
-sampling. They are completely accurate and will not vary from run to run
-if your program is deterministic.
+By contrast, the number-of-calls and basic-block figures are derived
+by counting, not sampling. They are completely accurate and will not
+vary from run to run if your program is deterministic and single
+threaded. In multi-threaded applications, or single threaded
+applications that link with multi-threaded libraries, the counts are
+only deterministic if the counting function is thread-safe. (Note:
+beware that the mcount counting function in glibc is @emph{not}
+thread-safe). @xref{Implementation, ,Implementation of Profiling}.
The @dfn{sampling period} that is printed at the beginning of the flat
profile says how often samples are taken. The rule of thumb is that a
added delay required to deliver the signal, this method is
less accurate as well.
-A special startup routine allocates memory for the histogram and
+A special startup routine allocates memory for the histogram and
either calls @code{profil()} or sets up
a clock signal handler.
This routine (@code{monstartup}) can be invoked in several ways.
records) are read, the memory ranges of each pair of histogram records
must be either equal, or non-overlapping. For each pair of histogram
records, the resolution (memory region size divided by the number of
-bins) must be the same. The time unit must be the same for all
+bins) must be the same. The time unit must be the same for all
histogram records. If the above containts are met, all histograms
for the same memory range are merged.
@node GNU Free Documentation License
@appendix GNU Free Documentation License
-@center Version 1.1, March 2000
-
-@display
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-51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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-@end display
-@sp 1
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-@sp 1
-@item
-TERMINATION
-
-You may not copy, modify, sublicense, or distribute the Document except
-as expressly provided for under this License. Any other attempt to
-copy, modify, sublicense or distribute the Document is void, and will
-automatically terminate your rights under this License. However,
-parties who have received copies, or rights, from you under this
-License will not have their licenses terminated so long as such
-parties remain in full compliance.
-@sp 1
-@item
-FUTURE REVISIONS OF THIS LICENSE
-
-The Free Software Foundation may publish new, revised versions
-of the GNU Free Documentation License from time to time. Such new
-versions will be similar in spirit to the present version, but may
-differ in detail to address new problems or concerns. See
-http://www.gnu.org/copyleft/.
-
-Each version of the License is given a distinguishing version number.
-If the Document specifies that a particular numbered version of this
-License ``or any later version'' applies to it, you have the option of
-following the terms and conditions either of that specified version or
-of any later version that has been published (not as a draft) by the
-Free Software Foundation. If the Document does not specify a version
-number of this License, you may choose any version ever published (not
-as a draft) by the Free Software Foundation.
-
-@end enumerate
-
-@unnumberedsec ADDENDUM: How to use this License for your documents
-
-To use this License in a document you have written, include a copy of
-the License in the document and put the following copyright and
-license notices just after the title page:
-
-@smallexample
-@group
-Copyright (C) @var{year} @var{your name}.
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.1
-or any later version published by the Free Software Foundation;
-with the Invariant Sections being @var{list their titles}, with the
-Front-Cover Texts being @var{list}, and with the Back-Cover Texts being @var{list}.
-A copy of the license is included in the section entitled "GNU
-Free Documentation License."
-@end group
-@end smallexample
-
-If you have no Invariant Sections, write ``with no Invariant Sections''
-instead of saying which ones are invariant. If you have no
-Front-Cover Texts, write ``no Front-Cover Texts'' instead of
-``Front-Cover Texts being @var{list}''; likewise for Back-Cover Texts.
-
-If your document contains nontrivial examples of program code, we
-recommend releasing these examples in parallel under your choice of
-free software license, such as the GNU General Public License,
-to permit their use in free software.
+@include fdl.texi
@bye
projects / deliverable / binutils-gdb.git / blobdiff