764 lines
29 KiB
Groff
764 lines
29 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "GPROF 1"
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.TH GPROF 1 "2019-12-09" "binutils-2.33.1" "GNU"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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gprof \- display call graph profile data
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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|
gprof [ \-[abcDhilLrsTvwxyz] ] [ \-[ACeEfFJnNOpPqQRStZ][\fIname\fR] ]
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[ \-I \fIdirs\fR ] [ \-d[\fInum\fR] ] [ \-k \fIfrom/to\fR ]
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[ \-m \fImin-count\fR ] [ \-R \fImap_file\fR ] [ \-t \fItable-length\fR ]
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[ \-\-[no\-]annotated\-source[=\fIname\fR] ]
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[ \-\-[no\-]exec\-counts[=\fIname\fR] ]
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[ \-\-[no\-]flat\-profile[=\fIname\fR] ] [ \-\-[no\-]graph[=\fIname\fR] ]
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[ \-\-[no\-]time=\fIname\fR] [ \-\-all\-lines ] [ \-\-brief ]
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[ \-\-debug[=\fIlevel\fR] ] [ \-\-function\-ordering ]
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[ \-\-file\-ordering \fImap_file\fR ] [ \-\-directory\-path=\fIdirs\fR ]
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[ \-\-display\-unused\-functions ] [ \-\-file\-format=\fIname\fR ]
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[ \-\-file\-info ] [ \-\-help ] [ \-\-line ] [ \-\-inline\-file\-names ]
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[ \-\-min\-count=\fIn\fR ] [ \-\-no\-static ] [ \-\-print\-path ]
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[ \-\-separate\-files ] [ \-\-static\-call\-graph ] [ \-\-sum ]
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|
[ \-\-table\-length=\fIlen\fR ] [ \-\-traditional ] [ \-\-version ]
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|
[ \-\-width=\fIn\fR ] [ \-\-ignore\-non\-functions ]
|
|
[ \-\-demangle[=\fI\s-1STYLE\s0\fR] ] [ \-\-no\-demangle ]
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|
[\-\-external\-symbol\-table=name]
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|
[ \fIimage-file\fR ] [ \fIprofile-file\fR ... ]
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.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
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|
\&\f(CW\*(C`gprof\*(C'\fR produces an execution profile of C, Pascal, or Fortran77
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|
programs. The effect of called routines is incorporated in the profile
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|
of each caller. The profile data is taken from the call graph profile file
|
|
(\fIgmon.out\fR default) which is created by programs
|
|
that are compiled with the \fB\-pg\fR option of
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|
\&\f(CW\*(C`cc\*(C'\fR, \f(CW\*(C`pc\*(C'\fR, and \f(CW\*(C`f77\*(C'\fR.
|
|
The \fB\-pg\fR option also links in versions of the library routines
|
|
that are compiled for profiling. \f(CW\*(C`Gprof\*(C'\fR reads the given object
|
|
file (the default is \f(CW\*(C`a.out\*(C'\fR) and establishes the relation between
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its symbol table and the call graph profile from \fIgmon.out\fR.
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If more than one profile file is specified, the \f(CW\*(C`gprof\*(C'\fR
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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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|
\&\f(CW\*(C`Gprof\*(C'\fR 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
|
|
of the cycle.
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.PP
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|
Several forms of output are available from the analysis.
|
|
.PP
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|
The \fIflat profile\fR 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.
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|
.PP
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|
The \fIcall graph\fR 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.
|
|
.PP
|
|
The \fIannotated source\fR listing is a copy of the program's
|
|
source code, labeled with the number of times each line of the
|
|
program was executed.
|
|
.SH "OPTIONS"
|
|
.IX Header "OPTIONS"
|
|
These options specify which of several output formats
|
|
\&\f(CW\*(C`gprof\*(C'\fR should produce.
|
|
.PP
|
|
Many of these options take an optional \fIsymspec\fR 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.
|
|
.PP
|
|
Specifying any of these options overrides the default (\fB\-p \-q\fR),
|
|
which prints a flat profile and call graph analysis
|
|
for all functions.
|
|
.ie n .IP """\-A[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-A[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-A[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-annotated\-source[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-annotated\-source[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--annotated-source[=symspec]"
|
|
.PD
|
|
The \fB\-A\fR option causes \f(CW\*(C`gprof\*(C'\fR to print annotated source code.
|
|
If \fIsymspec\fR is specified, print output only for matching symbols.
|
|
.ie n .IP """\-b""" 4
|
|
.el .IP "\f(CW\-b\fR" 4
|
|
.IX Item "-b"
|
|
.PD 0
|
|
.ie n .IP """\-\-brief""" 4
|
|
.el .IP "\f(CW\-\-brief\fR" 4
|
|
.IX Item "--brief"
|
|
.PD
|
|
If the \fB\-b\fR option is given, \f(CW\*(C`gprof\*(C'\fR 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.
|
|
.ie n .IP """\-C[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-C[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-C[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-exec\-counts[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-exec\-counts[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--exec-counts[=symspec]"
|
|
.PD
|
|
The \fB\-C\fR option causes \f(CW\*(C`gprof\*(C'\fR to
|
|
print a tally of functions and the number of times each was called.
|
|
If \fIsymspec\fR is specified, print tally only for matching symbols.
|
|
.Sp
|
|
If the profile data file contains basic-block count records, specifying
|
|
the \fB\-l\fR option, along with \fB\-C\fR, will cause basic-block
|
|
execution counts to be tallied and displayed.
|
|
.ie n .IP """\-i""" 4
|
|
.el .IP "\f(CW\-i\fR" 4
|
|
.IX Item "-i"
|
|
.PD 0
|
|
.ie n .IP """\-\-file\-info""" 4
|
|
.el .IP "\f(CW\-\-file\-info\fR" 4
|
|
.IX Item "--file-info"
|
|
.PD
|
|
The \fB\-i\fR option causes \f(CW\*(C`gprof\*(C'\fR 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.
|
|
.ie n .IP """\-I \f(CIdirs\f(CW""" 4
|
|
.el .IP "\f(CW\-I \f(CIdirs\f(CW\fR" 4
|
|
.IX Item "-I dirs"
|
|
.PD 0
|
|
.ie n .IP """\-\-directory\-path=\f(CIdirs\f(CW""" 4
|
|
.el .IP "\f(CW\-\-directory\-path=\f(CIdirs\f(CW\fR" 4
|
|
.IX Item "--directory-path=dirs"
|
|
.PD
|
|
The \fB\-I\fR option specifies a list of search directories in
|
|
which to find source files. Environment variable \fI\s-1GPROF_PATH\s0\fR
|
|
can also be used to convey this information.
|
|
Used mostly for annotated source output.
|
|
.ie n .IP """\-J[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-J[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-J[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-no\-annotated\-source[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-no\-annotated\-source[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--no-annotated-source[=symspec]"
|
|
.PD
|
|
The \fB\-J\fR option causes \f(CW\*(C`gprof\*(C'\fR not to
|
|
print annotated source code.
|
|
If \fIsymspec\fR is specified, \f(CW\*(C`gprof\*(C'\fR prints annotated source,
|
|
but excludes matching symbols.
|
|
.ie n .IP """\-L""" 4
|
|
.el .IP "\f(CW\-L\fR" 4
|
|
.IX Item "-L"
|
|
.PD 0
|
|
.ie n .IP """\-\-print\-path""" 4
|
|
.el .IP "\f(CW\-\-print\-path\fR" 4
|
|
.IX Item "--print-path"
|
|
.PD
|
|
Normally, source filenames are printed with the path
|
|
component suppressed. The \fB\-L\fR option causes \f(CW\*(C`gprof\*(C'\fR
|
|
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.
|
|
.ie n .IP """\-p[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-p[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-p[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-flat\-profile[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-flat\-profile[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--flat-profile[=symspec]"
|
|
.PD
|
|
The \fB\-p\fR option causes \f(CW\*(C`gprof\*(C'\fR to print a flat profile.
|
|
If \fIsymspec\fR is specified, print flat profile only for matching symbols.
|
|
.ie n .IP """\-P[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-P[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-P[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-no\-flat\-profile[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-no\-flat\-profile[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--no-flat-profile[=symspec]"
|
|
.PD
|
|
The \fB\-P\fR option causes \f(CW\*(C`gprof\*(C'\fR to suppress printing a flat profile.
|
|
If \fIsymspec\fR is specified, \f(CW\*(C`gprof\*(C'\fR prints a flat profile,
|
|
but excludes matching symbols.
|
|
.ie n .IP """\-q[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-q[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-q[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-graph[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-graph[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--graph[=symspec]"
|
|
.PD
|
|
The \fB\-q\fR option causes \f(CW\*(C`gprof\*(C'\fR to print the call graph analysis.
|
|
If \fIsymspec\fR is specified, print call graph only for matching symbols
|
|
and their children.
|
|
.ie n .IP """\-Q[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-Q[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-Q[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-no\-graph[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-no\-graph[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--no-graph[=symspec]"
|
|
.PD
|
|
The \fB\-Q\fR option causes \f(CW\*(C`gprof\*(C'\fR to suppress printing the
|
|
call graph.
|
|
If \fIsymspec\fR is specified, \f(CW\*(C`gprof\*(C'\fR prints a call graph,
|
|
but excludes matching symbols.
|
|
.ie n .IP """\-t""" 4
|
|
.el .IP "\f(CW\-t\fR" 4
|
|
.IX Item "-t"
|
|
.PD 0
|
|
.ie n .IP """\-\-table\-length=\f(CInum\f(CW""" 4
|
|
.el .IP "\f(CW\-\-table\-length=\f(CInum\f(CW\fR" 4
|
|
.IX Item "--table-length=num"
|
|
.PD
|
|
The \fB\-t\fR option causes the \fInum\fR most active source lines in
|
|
each source file to be listed when source annotation is enabled. The
|
|
default is 10.
|
|
.ie n .IP """\-y""" 4
|
|
.el .IP "\f(CW\-y\fR" 4
|
|
.IX Item "-y"
|
|
.PD 0
|
|
.ie n .IP """\-\-separate\-files""" 4
|
|
.el .IP "\f(CW\-\-separate\-files\fR" 4
|
|
.IX Item "--separate-files"
|
|
.PD
|
|
This option affects annotated source output only.
|
|
Normally, \f(CW\*(C`gprof\*(C'\fR prints annotated source files
|
|
to standard-output. If this option is specified,
|
|
annotated source for a file named \fIpath/\fIfilename\fI\fR
|
|
is generated in the file \fI\fIfilename\fI\-ann\fR. If the underlying
|
|
file system would truncate \fI\fIfilename\fI\-ann\fR so that it
|
|
overwrites the original \fI\fIfilename\fI\fR, \f(CW\*(C`gprof\*(C'\fR generates
|
|
annotated source in the file \fI\fIfilename\fI.ann\fR instead (if the
|
|
original file name has an extension, that extension is \fIreplaced\fR
|
|
with \fI.ann\fR).
|
|
.ie n .IP """\-Z[\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-Z[\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "-Z[symspec]"
|
|
.PD 0
|
|
.ie n .IP """\-\-no\-exec\-counts[=\f(CIsymspec\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-no\-exec\-counts[=\f(CIsymspec\f(CW]\fR" 4
|
|
.IX Item "--no-exec-counts[=symspec]"
|
|
.PD
|
|
The \fB\-Z\fR option causes \f(CW\*(C`gprof\*(C'\fR not to
|
|
print a tally of functions and the number of times each was called.
|
|
If \fIsymspec\fR is specified, print tally, but exclude matching symbols.
|
|
.ie n .IP """\-r""" 4
|
|
.el .IP "\f(CW\-r\fR" 4
|
|
.IX Item "-r"
|
|
.PD 0
|
|
.ie n .IP """\-\-function\-ordering""" 4
|
|
.el .IP "\f(CW\-\-function\-ordering\fR" 4
|
|
.IX Item "--function-ordering"
|
|
.PD
|
|
The \fB\-\-function\-ordering\fR option causes \f(CW\*(C`gprof\*(C'\fR 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.
|
|
.Sp
|
|
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.
|
|
.ie n .IP """\-R \f(CImap_file\f(CW""" 4
|
|
.el .IP "\f(CW\-R \f(CImap_file\f(CW\fR" 4
|
|
.IX Item "-R map_file"
|
|
.PD 0
|
|
.ie n .IP """\-\-file\-ordering \f(CImap_file\f(CW""" 4
|
|
.el .IP "\f(CW\-\-file\-ordering \f(CImap_file\f(CW\fR" 4
|
|
.IX Item "--file-ordering map_file"
|
|
.PD
|
|
The \fB\-\-file\-ordering\fR option causes \f(CW\*(C`gprof\*(C'\fR 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.
|
|
.Sp
|
|
Use of the \fB\-a\fR argument is highly recommended with this option.
|
|
.Sp
|
|
The \fImap_file\fR 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 \f(CW\*(C`nm\*(C'\fR.
|
|
.Sp
|
|
.Vb 8
|
|
\& 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
|
|
\& ...
|
|
.Ve
|
|
.Sp
|
|
To create a \fImap_file\fR with \s-1GNU\s0 \f(CW\*(C`nm\*(C'\fR, type a command like
|
|
\&\f(CW\*(C`nm \-\-extern\-only \-\-defined\-only \-v \-\-print\-file\-name program\-name\*(C'\fR.
|
|
.ie n .IP """\-T""" 4
|
|
.el .IP "\f(CW\-T\fR" 4
|
|
.IX Item "-T"
|
|
.PD 0
|
|
.ie n .IP """\-\-traditional""" 4
|
|
.el .IP "\f(CW\-\-traditional\fR" 4
|
|
.IX Item "--traditional"
|
|
.PD
|
|
The \fB\-T\fR option causes \f(CW\*(C`gprof\*(C'\fR to print its output in
|
|
\&\*(L"traditional\*(R" \s-1BSD\s0 style.
|
|
.ie n .IP """\-w \f(CIwidth\f(CW""" 4
|
|
.el .IP "\f(CW\-w \f(CIwidth\f(CW\fR" 4
|
|
.IX Item "-w width"
|
|
.PD 0
|
|
.ie n .IP """\-\-width=\f(CIwidth\f(CW""" 4
|
|
.el .IP "\f(CW\-\-width=\f(CIwidth\f(CW\fR" 4
|
|
.IX Item "--width=width"
|
|
.PD
|
|
Sets width of output lines to \fIwidth\fR.
|
|
Currently only used when printing the function index at the bottom
|
|
of the call graph.
|
|
.ie n .IP """\-x""" 4
|
|
.el .IP "\f(CW\-x\fR" 4
|
|
.IX Item "-x"
|
|
.PD 0
|
|
.ie n .IP """\-\-all\-lines""" 4
|
|
.el .IP "\f(CW\-\-all\-lines\fR" 4
|
|
.IX Item "--all-lines"
|
|
.PD
|
|
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 \f(CW\*(C`tcov\*(C'\fR's \fB\-a\fR.
|
|
.ie n .IP """\-\-demangle[=\f(CIstyle\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-demangle[=\f(CIstyle\f(CW]\fR" 4
|
|
.IX Item "--demangle[=style]"
|
|
.PD 0
|
|
.ie n .IP """\-\-no\-demangle""" 4
|
|
.el .IP "\f(CW\-\-no\-demangle\fR" 4
|
|
.IX Item "--no-demangle"
|
|
.PD
|
|
These options control whether \*(C+ symbol names should be demangled when
|
|
printing output. The default is to demangle symbols. The
|
|
\&\f(CW\*(C`\-\-no\-demangle\*(C'\fR 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.
|
|
.SS "Analysis Options"
|
|
.IX Subsection "Analysis Options"
|
|
.ie n .IP """\-a""" 4
|
|
.el .IP "\f(CW\-a\fR" 4
|
|
.IX Item "-a"
|
|
.PD 0
|
|
.ie n .IP """\-\-no\-static""" 4
|
|
.el .IP "\f(CW\-\-no\-static\fR" 4
|
|
.IX Item "--no-static"
|
|
.PD
|
|
The \fB\-a\fR option causes \f(CW\*(C`gprof\*(C'\fR 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.
|
|
.ie n .IP """\-c""" 4
|
|
.el .IP "\f(CW\-c\fR" 4
|
|
.IX Item "-c"
|
|
.PD 0
|
|
.ie n .IP """\-\-static\-call\-graph""" 4
|
|
.el .IP "\f(CW\-\-static\-call\-graph\fR" 4
|
|
.IX Item "--static-call-graph"
|
|
.PD
|
|
The \fB\-c\fR 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 \fInot\fR found
|
|
by this option.
|
|
Parents or children identified via this heuristic
|
|
are indicated in the call graph with call counts of \fB0\fR.
|
|
.ie n .IP """\-D""" 4
|
|
.el .IP "\f(CW\-D\fR" 4
|
|
.IX Item "-D"
|
|
.PD 0
|
|
.ie n .IP """\-\-ignore\-non\-functions""" 4
|
|
.el .IP "\f(CW\-\-ignore\-non\-functions\fR" 4
|
|
.IX Item "--ignore-non-functions"
|
|
.PD
|
|
The \fB\-D\fR option causes \f(CW\*(C`gprof\*(C'\fR 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 \s-1HPUX\s0 for
|
|
example).
|
|
.ie n .IP """\-k \f(CIfrom\f(CW/\f(CIto\f(CW""" 4
|
|
.el .IP "\f(CW\-k \f(CIfrom\f(CW/\f(CIto\f(CW\fR" 4
|
|
.IX Item "-k from/to"
|
|
The \fB\-k\fR option allows you to delete from the call graph any arcs from
|
|
symbols matching symspec \fIfrom\fR to those matching symspec \fIto\fR.
|
|
.ie n .IP """\-l""" 4
|
|
.el .IP "\f(CW\-l\fR" 4
|
|
.IX Item "-l"
|
|
.PD 0
|
|
.ie n .IP """\-\-line""" 4
|
|
.el .IP "\f(CW\-\-line\fR" 4
|
|
.IX Item "--line"
|
|
.PD
|
|
The \fB\-l\fR 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 \f(CW\*(C`gcc\*(C'\fR compiler. Newer versions of
|
|
\&\f(CW\*(C`gcc\*(C'\fR are designed to work with the \f(CW\*(C`gcov\*(C'\fR tool instead.
|
|
.Sp
|
|
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 \f(CW\*(C`gprof\*(C'\fR, and magnifies statistical
|
|
inaccuracies.
|
|
.ie n .IP """\-\-inline\-file\-names""" 4
|
|
.el .IP "\f(CW\-\-inline\-file\-names\fR" 4
|
|
.IX Item "--inline-file-names"
|
|
This option causes \f(CW\*(C`gprof\*(C'\fR 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 \fB\-L\fR option.
|
|
.ie n .IP """\-m \f(CInum\f(CW""" 4
|
|
.el .IP "\f(CW\-m \f(CInum\f(CW\fR" 4
|
|
.IX Item "-m num"
|
|
.PD 0
|
|
.ie n .IP """\-\-min\-count=\f(CInum\f(CW""" 4
|
|
.el .IP "\f(CW\-\-min\-count=\f(CInum\f(CW\fR" 4
|
|
.IX Item "--min-count=num"
|
|
.PD
|
|
This option affects execution count output only.
|
|
Symbols that are executed less than \fInum\fR times are suppressed.
|
|
.ie n .IP """\-n\f(CIsymspec\f(CW""" 4
|
|
.el .IP "\f(CW\-n\f(CIsymspec\f(CW\fR" 4
|
|
.IX Item "-nsymspec"
|
|
.PD 0
|
|
.ie n .IP """\-\-time=\f(CIsymspec\f(CW""" 4
|
|
.el .IP "\f(CW\-\-time=\f(CIsymspec\f(CW\fR" 4
|
|
.IX Item "--time=symspec"
|
|
.PD
|
|
The \fB\-n\fR option causes \f(CW\*(C`gprof\*(C'\fR, in its call graph analysis,
|
|
to only propagate times for symbols matching \fIsymspec\fR.
|
|
.ie n .IP """\-N\f(CIsymspec\f(CW""" 4
|
|
.el .IP "\f(CW\-N\f(CIsymspec\f(CW\fR" 4
|
|
.IX Item "-Nsymspec"
|
|
.PD 0
|
|
.ie n .IP """\-\-no\-time=\f(CIsymspec\f(CW""" 4
|
|
.el .IP "\f(CW\-\-no\-time=\f(CIsymspec\f(CW\fR" 4
|
|
.IX Item "--no-time=symspec"
|
|
.PD
|
|
The \fB\-n\fR option causes \f(CW\*(C`gprof\*(C'\fR, in its call graph analysis,
|
|
not to propagate times for symbols matching \fIsymspec\fR.
|
|
.ie n .IP """\-S\f(CIfilename\f(CW""" 4
|
|
.el .IP "\f(CW\-S\f(CIfilename\f(CW\fR" 4
|
|
.IX Item "-Sfilename"
|
|
.PD 0
|
|
.ie n .IP """\-\-external\-symbol\-table=\f(CIfilename\f(CW""" 4
|
|
.el .IP "\f(CW\-\-external\-symbol\-table=\f(CIfilename\f(CW\fR" 4
|
|
.IX Item "--external-symbol-table=filename"
|
|
.PD
|
|
The \fB\-S\fR option causes \f(CW\*(C`gprof\*(C'\fR to read an external symbol table
|
|
file, such as \fI/proc/kallsyms\fR, rather than read the symbol table
|
|
from the given object file (the default is \f(CW\*(C`a.out\*(C'\fR). This is useful
|
|
for profiling kernel modules.
|
|
.ie n .IP """\-z""" 4
|
|
.el .IP "\f(CW\-z\fR" 4
|
|
.IX Item "-z"
|
|
.PD 0
|
|
.ie n .IP """\-\-display\-unused\-functions""" 4
|
|
.el .IP "\f(CW\-\-display\-unused\-functions\fR" 4
|
|
.IX Item "--display-unused-functions"
|
|
.PD
|
|
If you give the \fB\-z\fR option, \f(CW\*(C`gprof\*(C'\fR 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
|
|
\&\fB\-c\fR option for discovering which routines were never called.
|
|
.SS "Miscellaneous Options"
|
|
.IX Subsection "Miscellaneous Options"
|
|
.ie n .IP """\-d[\f(CInum\f(CW]""" 4
|
|
.el .IP "\f(CW\-d[\f(CInum\f(CW]\fR" 4
|
|
.IX Item "-d[num]"
|
|
.PD 0
|
|
.ie n .IP """\-\-debug[=\f(CInum\f(CW]""" 4
|
|
.el .IP "\f(CW\-\-debug[=\f(CInum\f(CW]\fR" 4
|
|
.IX Item "--debug[=num]"
|
|
.PD
|
|
The \fB\-d\fR \fInum\fR option specifies debugging options.
|
|
If \fInum\fR is not specified, enable all debugging.
|
|
.ie n .IP """\-h""" 4
|
|
.el .IP "\f(CW\-h\fR" 4
|
|
.IX Item "-h"
|
|
.PD 0
|
|
.ie n .IP """\-\-help""" 4
|
|
.el .IP "\f(CW\-\-help\fR" 4
|
|
.IX Item "--help"
|
|
.PD
|
|
The \fB\-h\fR option prints command line usage.
|
|
.ie n .IP """\-O\f(CIname\f(CW""" 4
|
|
.el .IP "\f(CW\-O\f(CIname\f(CW\fR" 4
|
|
.IX Item "-Oname"
|
|
.PD 0
|
|
.ie n .IP """\-\-file\-format=\f(CIname\f(CW""" 4
|
|
.el .IP "\f(CW\-\-file\-format=\f(CIname\f(CW\fR" 4
|
|
.IX Item "--file-format=name"
|
|
.PD
|
|
Selects the format of the profile data files. Recognized formats are
|
|
\&\fBauto\fR (the default), \fBbsd\fR, \fB4.4bsd\fR, \fBmagic\fR, and
|
|
\&\fBprof\fR (not yet supported).
|
|
.ie n .IP """\-s""" 4
|
|
.el .IP "\f(CW\-s\fR" 4
|
|
.IX Item "-s"
|
|
.PD 0
|
|
.ie n .IP """\-\-sum""" 4
|
|
.el .IP "\f(CW\-\-sum\fR" 4
|
|
.IX Item "--sum"
|
|
.PD
|
|
The \fB\-s\fR option causes \f(CW\*(C`gprof\*(C'\fR to summarize the information
|
|
in the profile data files it read in, and write out a profile data
|
|
file called \fIgmon.sum\fR, which contains all the information from
|
|
the profile data files that \f(CW\*(C`gprof\*(C'\fR read in. The file \fIgmon.sum\fR
|
|
may be one of the specified input files; the effect of this is to
|
|
merge the data in the other input files into \fIgmon.sum\fR.
|
|
.Sp
|
|
Eventually you can run \f(CW\*(C`gprof\*(C'\fR again without \fB\-s\fR to analyze the
|
|
cumulative data in the file \fIgmon.sum\fR.
|
|
.ie n .IP """\-v""" 4
|
|
.el .IP "\f(CW\-v\fR" 4
|
|
.IX Item "-v"
|
|
.PD 0
|
|
.ie n .IP """\-\-version""" 4
|
|
.el .IP "\f(CW\-\-version\fR" 4
|
|
.IX Item "--version"
|
|
.PD
|
|
The \fB\-v\fR flag causes \f(CW\*(C`gprof\*(C'\fR to print the current version
|
|
number, and then exit.
|
|
.SS "Deprecated Options"
|
|
.IX Subsection "Deprecated Options"
|
|
These options have been replaced with newer versions that use symspecs.
|
|
.ie n .IP """\-e \f(CIfunction_name\f(CW""" 4
|
|
.el .IP "\f(CW\-e \f(CIfunction_name\f(CW\fR" 4
|
|
.IX Item "-e function_name"
|
|
The \fB\-e\fR \fIfunction\fR option tells \f(CW\*(C`gprof\*(C'\fR to not print
|
|
information about the function \fIfunction_name\fR (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 \fB[not printed]\fR. More than one \fB\-e\fR option may be
|
|
given; only one \fIfunction_name\fR may be indicated with each \fB\-e\fR
|
|
option.
|
|
.ie n .IP """\-E \f(CIfunction_name\f(CW""" 4
|
|
.el .IP "\f(CW\-E \f(CIfunction_name\f(CW\fR" 4
|
|
.IX Item "-E function_name"
|
|
The \f(CW\*(C`\-E \f(CIfunction\f(CW\*(C'\fR option works like the \f(CW\*(C`\-e\*(C'\fR 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 \fB\-E\fR option may be given; only one
|
|
\&\fIfunction_name\fR may be indicated with each \fB\-E\fR option.
|
|
.ie n .IP """\-f \f(CIfunction_name\f(CW""" 4
|
|
.el .IP "\f(CW\-f \f(CIfunction_name\f(CW\fR" 4
|
|
.IX Item "-f function_name"
|
|
The \fB\-f\fR \fIfunction\fR option causes \f(CW\*(C`gprof\*(C'\fR to limit the
|
|
call graph to the function \fIfunction_name\fR and its children (and
|
|
their children...). More than one \fB\-f\fR option may be given;
|
|
only one \fIfunction_name\fR may be indicated with each \fB\-f\fR
|
|
option.
|
|
.ie n .IP """\-F \f(CIfunction_name\f(CW""" 4
|
|
.el .IP "\f(CW\-F \f(CIfunction_name\f(CW\fR" 4
|
|
.IX Item "-F function_name"
|
|
The \fB\-F\fR \fIfunction\fR option works like the \f(CW\*(C`\-f\*(C'\fR 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 \fB\-F\fR option
|
|
may be given; only one \fIfunction_name\fR may be indicated with each
|
|
\&\fB\-F\fR option. The \fB\-F\fR option overrides the \fB\-E\fR option.
|
|
.SH "FILES"
|
|
.IX Header "FILES"
|
|
.ie n .IP """\f(CIa.out\f(CW""" 4
|
|
.el .IP "\f(CW\f(CIa.out\f(CW\fR" 4
|
|
.IX Item "a.out"
|
|
the namelist and text space.
|
|
.ie n .IP """\f(CIgmon.out\f(CW""" 4
|
|
.el .IP "\f(CW\f(CIgmon.out\f(CW\fR" 4
|
|
.IX Item "gmon.out"
|
|
dynamic call graph and profile.
|
|
.ie n .IP """\f(CIgmon.sum\f(CW""" 4
|
|
.el .IP "\f(CW\f(CIgmon.sum\f(CW\fR" 4
|
|
.IX Item "gmon.sum"
|
|
summarized dynamic call graph and profile.
|
|
.SH "BUGS"
|
|
.IX Header "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.
|
|
.PP
|
|
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.
|
|
.PP
|
|
The profiled program must call \f(CW\*(C`exit\*(C'\fR(2)
|
|
or return normally for the profiling information to be saved
|
|
in the \fIgmon.out\fR file.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fImonitor\fR\|(3), \fIprofil\fR\|(2), \fIcc\fR\|(1), \fIprof\fR\|(1), and the Info entry for \fIgprof\fR.
|
|
.PP
|
|
\&\*(L"An Execution Profiler for Modular Programs\*(R",
|
|
by S. Graham, P. Kessler, M. McKusick;
|
|
Software \- Practice and Experience,
|
|
Vol. 13, pp. 671\-685, 1983.
|
|
.PP
|
|
\&\*(L"gprof: A Call Graph Execution Profiler\*(R",
|
|
by S. Graham, P. Kessler, M. McKusick;
|
|
Proceedings of the \s-1SIGPLAN\s0 '82 Symposium on Compiler Construction,
|
|
\&\s-1SIGPLAN\s0 Notices, Vol. 17, No 6, pp. 120\-126, June 1982.
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright (c) 1988\-2019 Free Software Foundation, Inc.
|
|
.PP
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the \s-1GNU\s0 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 \*(L"\s-1GNU\s0 Free Documentation License\*(R".
|