x86_64-linux-gnu-gprof - display call graph profile data - man(1) - [phpMan]

Che Dong

GPROF(1) GNU GPROF(1)

NAME
gprof - display call graph profile data

SYNOPSIS
gprof [ -[abcDhilLrsTvwxyz] ] [ -[ABCeEfFJnNOpPqQRStZ][name] ]
[ -I dirs ] [ -d[num] ] [ -k from/to ]
[ -m min-count ] [ -R map_file ] [ -t table-length ]
[ --[no-]annotated-source[=name] ]
[ --[no-]exec-counts[=name] ]
[ --[no-]flat-profile[=name] ] [ --[no-]graph[=name] ]
[ --[no-]time=name] [ --all-lines ] [ --brief ]
[ --debug[=level] ] [ --function-ordering ]
[ --file-ordering map_file ] [ --directory-path=dirs ]
[ --display-unused-functions ] [ --file-format=name ]
[ --file-info ] [ --help ] [ --line ] [ --inline-file-names ]
[ --min-count=n ] [ --no-static ] [ --print-path ]
[ --separate-files ] [ --static-call-graph ] [ --sum ]
[ --table-length=len ] [ --traditional ] [ --version ]
[ --width=n ] [ --ignore-non-functions ]
[ --demangle[=STYLE] ] [ --no-demangle ]
[--external-symbol-table=name]
[ image-file ] [ profile-file ... ]

DESCRIPTION
"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 (gmon.out default) which is created by programs that are
compiled with the -pg option of "cc", "pc", and "f77". The -pg option also links in versions
of the library routines that are compiled for profiling. "Gprof" reads the given object file
(the default is "a.out") and establishes the relation between its symbol table and the call
graph profile from gmon.out. If more than one profile file is specified, the "gprof" output
shows the sum of the profile information in the given profile files.

If you use gcc 2.95.x or 3.0 to compile your binaries, you may need to add the -fprofile-arcs
to the compile command line in order for the call graphs to be properly stored in gmon.out.

"Gprof" calculates the amount of time spent in each routine. Next, these times are
propagated along the edges of the call graph. Cycles are discovered, and calls into a cycle
are made to share the time of the cycle.

Several forms of output are available from the analysis.

The flat profile shows how much time your program spent in each function, and how many times
that function was called. If you simply want to know which functions burn most of the
cycles, it is stated concisely here.

The call graph shows, for each function, which functions called it, which other functions it
called, and how many times. There is also an estimate of how much time was spent in the
subroutines of each function. This can suggest places where you might try to eliminate
function calls that use a lot of time.

The annotated source listing is a copy of the program's source code, labeled with the number
of times each line of the program was executed.

OPTIONS
These options specify which of several output formats "gprof" should produce.

Many of these options take an optional symspec to specify functions to be included or
excluded. These options can be specified multiple times, with different symspecs, to include
or exclude sets of symbols.

Specifying any of these options overrides the default (-p -q), which prints a flat profile
and call graph analysis for all functions.

"-A[symspec]"
"--annotated-source[=symspec]"
The -A option causes "gprof" to print annotated source code. If symspec is specified,
print output only for matching symbols.

"-b"
"--brief"
If the -b option is given, "gprof" doesn't print the verbose blurbs that try to explain
the meaning of all of the fields in the tables. This is useful if you intend to print
out the output, or are tired of seeing the blurbs.

"-B"
The -B option causes "gprof" to print the call graph analysis.

"-C[symspec]"
"--exec-counts[=symspec]"
The -C option causes "gprof" to print a tally of functions and the number of times each
was called. If symspec is specified, print tally only for matching symbols.

If the profile data file contains basic-block count records, specifying the -l option,
along with -C, will cause basic-block execution counts to be tallied and displayed.

"-i"
"--file-info"
The -i option causes "gprof" to display summary information about the profile data
file(s) and then exit. The number of histogram, call graph, and basic-block count
records is displayed.

"-I dirs"
"--directory-path=dirs"
The -I option specifies a list of search directories in which to find source files.
Environment variable GPROF_PATH can also be used to convey this information. Used mostly
for annotated source output.

"-J[symspec]"
"--no-annotated-source[=symspec]"
The -J option causes "gprof" not to print annotated source code. If symspec is
specified, "gprof" prints annotated source, but excludes matching symbols.

"-L"
"--print-path"
Normally, source filenames are printed with the path component suppressed. The -L option
causes "gprof" to print the full pathname of source filenames, which is determined from
symbolic debugging information in the image file and is relative to the directory in
which the compiler was invoked.

"-p[symspec]"
"--flat-profile[=symspec]"
The -p option causes "gprof" to print a flat profile. If symspec is specified, print
flat profile only for matching symbols.

"-P[symspec]"
"--no-flat-profile[=symspec]"
The -P option causes "gprof" to suppress printing a flat profile. If symspec is
specified, "gprof" prints a flat profile, but excludes matching symbols.

"-q[symspec]"
"--graph[=symspec]"
The -q option causes "gprof" to print the call graph analysis. If symspec is specified,
print call graph only for matching symbols and their children.

"-Q[symspec]"
"--no-graph[=symspec]"
The -Q option causes "gprof" to suppress printing the call graph. If symspec is
specified, "gprof" prints a call graph, but excludes matching symbols.

"-t"
"--table-length=num"
The -t option causes the num most active source lines in each source file to be listed
when source annotation is enabled. The default is 10.

"-y"
"--separate-files"
This option affects annotated source output only. Normally, "gprof" prints annotated
source files to standard-output. If this option is specified, annotated source for a
file named path/filename is generated in the file filename-ann. If the underlying file
system would truncate filename-ann so that it overwrites the original filename, "gprof"
generates annotated source in the file filename.ann instead (if the original file name
has an extension, that extension is replaced with .ann).

"-Z[symspec]"
"--no-exec-counts[=symspec]"
The -Z option causes "gprof" not to print a tally of functions and the number of times
each was called. If symspec is specified, print tally, but exclude matching symbols.

"-r"
"--function-ordering"
The --function-ordering option causes "gprof" to print a suggested function ordering for
the program based on profiling data. This option suggests an ordering which may improve
paging, tlb and cache behavior for the program on systems which support arbitrary
ordering of functions in an executable.

The exact details of how to force the linker to place functions in a particular order is
system dependent and out of the scope of this manual.

"-R map_file"
"--file-ordering map_file"
The --file-ordering option causes "gprof" to print a suggested .o link line ordering for
the program based on profiling data. This option suggests an ordering which may improve
paging, tlb and cache behavior for the program on systems which do not support arbitrary
ordering of functions in an executable.

Use of the -a argument is highly recommended with this option.

The map_file argument is a pathname to a file which provides function name to object file
mappings. The format of the file is similar to the output of the program "nm".

c-parse.o:00000000 T yyparse
c-parse.o:00000004 C yyerrflag
c-lang.o:00000000 T maybe_objc_method_name
c-lang.o:00000000 T print_lang_statistics
c-lang.o:00000000 T recognize_objc_keyword
c-decl.o:00000000 T print_lang_identifier
c-decl.o:00000000 T print_lang_type
...

To create a map_file with GNU "nm", type a command like "nm --extern-only --defined-only
-v --print-file-name program-name".

"-T"
"--traditional"
The -T option causes "gprof" to print its output in "traditional" BSD style.

"-w width"
"--width=width"
Sets width of output lines to width. Currently only used when printing the function
index at the bottom of the call graph.

"-x"
"--all-lines"
This option affects annotated source output only. By default, only the lines at the
beginning of a basic-block are annotated. If this option is specified, every line in a
basic-block is annotated by repeating the annotation for the first line. This behavior
is similar to "tcov"'s -a.

"--demangle[=style]"
"--no-demangle"
These options control whether C++ symbol names should be demangled when printing output.
The default is to demangle symbols. The "--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.

Analysis Options
"-a"
"--no-static"
The -a option causes "gprof" to suppress the printing of statically declared (private)
functions. (These are functions whose names are not listed as global, and which are not
visible outside the 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. This option affects both the flat
profile and the call graph.

"-c"
"--static-call-graph"
The -c option causes the call graph of the program to be augmented by a heuristic which
examines the text space of the object file and identifies function calls in the binary
machine code. Since normal call graph records are only generated when functions are
entered, this option identifies children that could have been called, but never were.
Calls to functions that were not compiled with profiling enabled are also identified, but
only if symbol table entries are present for them. Calls to dynamic library routines are
typically not found by this option. Parents or children identified via this heuristic
are indicated in the call graph with call counts of 0.

"-D"
"--ignore-non-functions"
The -D option causes "gprof" to ignore symbols which are not known to be functions. This
option will give more accurate profile data on systems where it is supported (Solaris and
HPUX for example).

"-k from/to"
The -k option allows you to delete from the call graph any arcs from symbols matching
symspec from to those matching symspec to.

"-l"
"--line"
The -l option enables line-by-line profiling, which causes histogram hits to be charged
to individual source code lines, instead of functions. This feature only works with
programs compiled by older versions of the "gcc" compiler. Newer versions of "gcc" are
designed to work with the "gcov" tool instead.

If the program was compiled with basic-block counting enabled, this option will also
identify how many times each line of code was executed. While line-by-line profiling can
help isolate where in a large function a program is spending its time, it also
significantly increases the running time of "gprof", and magnifies statistical
inaccuracies.

"--inline-file-names"
This option causes "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 -L
option.

"-m num"
"--min-count=num"
This option affects execution count output only. Symbols that are executed less than num
times are suppressed.

"-nsymspec"
"--time=symspec"
The -n option causes "gprof", in its call graph analysis, to only propagate times for
symbols matching symspec.

"-Nsymspec"
"--no-time=symspec"
The -n option causes "gprof", in its call graph analysis, not to propagate times for
symbols matching symspec.

"-Sfilename"
"--external-symbol-table=filename"
The -S option causes "gprof" to read an external symbol table file, such as
/proc/kallsyms, rather than read the symbol table from the given object file (the default
is "a.out"). This is useful for profiling kernel modules.

"-z"
"--display-unused-functions"
If you give the -z option, "gprof" will mention all functions in the flat profile, even
those that were never called, and that had no time spent in them. This is useful in
conjunction with the -c option for discovering which routines were never called.

Miscellaneous Options
"-d[num]"
"--debug[=num]"
The -d num option specifies debugging options. If num is not specified, enable all
debugging.

"-h"
"--help"
The -h option prints command line usage.

"-Oname"
"--file-format=name"
Selects the format of the profile data files. Recognized formats are auto (the default),
bsd, 4.4bsd, magic, and prof (not yet supported).

"-s"
"--sum"
The -s option causes "gprof" to summarize the information in the profile data files it
read in, and write out a profile data file called gmon.sum, which contains all the
information from the profile data files that "gprof" read in. The file gmon.sum may be
one of the specified input files; the effect of this is to merge the data in the other
input files into gmon.sum.

Eventually you can run "gprof" again without -s to analyze the cumulative data in the
file gmon.sum.

"-v"
"--version"
The -v flag causes "gprof" to print the current version number, and then exit.

Deprecated Options
These options have been replaced with newer versions that use symspecs.

"-e function_name"
The -e function option tells "gprof" to not print information about the function
function_name (and its children...) in the call graph. The function will still be listed
as a child of any functions that call it, but its index number will be shown as [not
printed]. More than one -e option may be given; only one function_name may be indicated
with each -e option.

"-E function_name"
The "-E function" option works like the "-e" option, but time spent in the function (and
children who were not called from anywhere else), will not be used to compute the
percentages-of-time for the call graph. More than one -E option may be given; only one
function_name may be indicated with each -E option.

"-f function_name"
The -f function option causes "gprof" to limit the call graph to the function
function_name and its children (and their children...). More than one -f option may be
given; only one function_name may be indicated with each -f option.

"-F function_name"
The -F function option works like the "-f" option, but only time spent in the function
and its children (and their children...) will be used to determine total-time and
percentages-of-time for the call graph. More than one -F option may be given; only one
function_name may be indicated with each -F option. The -F option overrides the -E
option.

FILES
"a.out"
the namelist and text space.

"gmon.out"
dynamic call graph and profile.

"gmon.sum"
summarized dynamic call graph and profile.

BUGS
The granularity of the sampling is shown, but remains statistical at best. We assume that
the time for each execution of a function can be expressed by the total time for the function
divided by the number of times the function is called. Thus the time propagated along the
call graph arcs to the function's parents is directly proportional to the number of times
that arc is traversed.

Parents that are not themselves profiled will have the time of their profiled children
propagated to them, but they will appear to be spontaneously invoked in the call graph
listing, and will not have their time propagated further. Similarly, signal catchers, even
though profiled, will appear to be spontaneous (although for more obscure reasons). Any
profiled children of signal catchers should have their times propagated properly, unless the
signal catcher was invoked during the execution of the profiling routine, in which case all
is lost.

The profiled program must call "exit"(2) or return normally for the profiling information to
be saved in the gmon.out file.

SEE ALSO
cc(1), prof(1), and the Info entry for gprof.

"An Execution Profiler for Modular Programs", by S. Graham, P. Kessler, M. McKusick; Software
- Practice and Experience, Vol. 13, pp. 671-685, 1983.

"gprof: A Call Graph Execution Profiler", by S. Graham, P. Kessler, M. McKusick; Proceedings
of the SIGPLAN '82 Symposium on Compiler Construction, SIGPLAN Notices, Vol. 17, No 6, pp.
120-126, June 1982.

Permission is granted to copy, distribute and/or modify this document 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 section entitled "GNU Free
Documentation License".

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