Andrea Falcone | 1c4977f | 2020-07-23 10:58:25 -0400 | [diff] [blame] | 1 | .\" Automatically generated by Pod::Man 4.06 (Pod::Simple 3.32) |
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| 128 | .rm #[ #] #H #V #F C |
| 129 | .\" ======================================================================== |
| 130 | .\" |
| 131 | .IX Title "GPROF 1" |
| 132 | .TH GPROF 1 "2020-04-01" "binutils-2.27.0" "GNU" |
| 133 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 134 | .\" way too many mistakes in technical documents. |
| 135 | .if n .ad l |
| 136 | .nh |
| 137 | .SH "NAME" |
| 138 | gprof \- display call graph profile data |
| 139 | .SH "SYNOPSIS" |
| 140 | .IX Header "SYNOPSIS" |
| 141 | gprof [ \-[abcDhilLrsTvwxyz] ] [ \-[ACeEfFJnNOpPqQZ][\fIname\fR] ] |
| 142 | [ \-I \fIdirs\fR ] [ \-d[\fInum\fR] ] [ \-k \fIfrom/to\fR ] |
| 143 | [ \-m \fImin-count\fR ] [ \-R \fImap_file\fR ] [ \-t \fItable-length\fR ] |
| 144 | [ \-\-[no\-]annotated\-source[=\fIname\fR] ] |
| 145 | [ \-\-[no\-]exec\-counts[=\fIname\fR] ] |
| 146 | [ \-\-[no\-]flat\-profile[=\fIname\fR] ] [ \-\-[no\-]graph[=\fIname\fR] ] |
| 147 | [ \-\-[no\-]time=\fIname\fR] [ \-\-all\-lines ] [ \-\-brief ] |
| 148 | [ \-\-debug[=\fIlevel\fR] ] [ \-\-function\-ordering ] |
| 149 | [ \-\-file\-ordering \fImap_file\fR ] [ \-\-directory\-path=\fIdirs\fR ] |
| 150 | [ \-\-display\-unused\-functions ] [ \-\-file\-format=\fIname\fR ] |
| 151 | [ \-\-file\-info ] [ \-\-help ] [ \-\-line ] [ \-\-inline\-file\-names ] |
| 152 | [ \-\-min\-count=\fIn\fR ] [ \-\-no\-static ] [ \-\-print\-path ] |
| 153 | [ \-\-separate\-files ] [ \-\-static\-call\-graph ] [ \-\-sum ] |
| 154 | [ \-\-table\-length=\fIlen\fR ] [ \-\-traditional ] [ \-\-version ] |
| 155 | [ \-\-width=\fIn\fR ] [ \-\-ignore\-non\-functions ] |
| 156 | [ \-\-demangle[=\fI\s-1STYLE\s0\fR] ] [ \-\-no\-demangle ] |
| 157 | [\-\-external\-symbol\-table=name] |
| 158 | [ \fIimage-file\fR ] [ \fIprofile-file\fR ... ] |
| 159 | .SH "DESCRIPTION" |
| 160 | .IX Header "DESCRIPTION" |
| 161 | \&\f(CW\*(C`gprof\*(C'\fR produces an execution profile of C, Pascal, or Fortran77 |
| 162 | programs. The effect of called routines is incorporated in the profile |
| 163 | of each caller. The profile data is taken from the call graph profile file |
| 164 | (\fIgmon.out\fR default) which is created by programs |
| 165 | that are compiled with the \fB\-pg\fR option of |
| 166 | \&\f(CW\*(C`cc\*(C'\fR, \f(CW\*(C`pc\*(C'\fR, and \f(CW\*(C`f77\*(C'\fR. |
| 167 | The \fB\-pg\fR option also links in versions of the library routines |
| 168 | that are compiled for profiling. \f(CW\*(C`Gprof\*(C'\fR reads the given object |
| 169 | file (the default is \f(CW\*(C`a.out\*(C'\fR) and establishes the relation between |
| 170 | its symbol table and the call graph profile from \fIgmon.out\fR. |
| 171 | If more than one profile file is specified, the \f(CW\*(C`gprof\*(C'\fR |
| 172 | output shows the sum of the profile information in the given profile files. |
| 173 | .PP |
| 174 | \&\f(CW\*(C`Gprof\*(C'\fR calculates the amount of time spent in each routine. |
| 175 | Next, these times are propagated along the edges of the call graph. |
| 176 | Cycles are discovered, and calls into a cycle are made to share the time |
| 177 | of the cycle. |
| 178 | .PP |
| 179 | Several forms of output are available from the analysis. |
| 180 | .PP |
| 181 | The \fIflat profile\fR shows how much time your program spent in each function, |
| 182 | and how many times that function was called. If you simply want to know |
| 183 | which functions burn most of the cycles, it is stated concisely here. |
| 184 | .PP |
| 185 | The \fIcall graph\fR shows, for each function, which functions called it, which |
| 186 | other functions it called, and how many times. There is also an estimate |
| 187 | of how much time was spent in the subroutines of each function. This can |
| 188 | suggest places where you might try to eliminate function calls that use a |
| 189 | lot of time. |
| 190 | .PP |
| 191 | The \fIannotated source\fR listing is a copy of the program's |
| 192 | source code, labeled with the number of times each line of the |
| 193 | program was executed. |
| 194 | .SH "OPTIONS" |
| 195 | .IX Header "OPTIONS" |
| 196 | These options specify which of several output formats |
| 197 | \&\f(CW\*(C`gprof\*(C'\fR should produce. |
| 198 | .PP |
| 199 | Many of these options take an optional \fIsymspec\fR to specify |
| 200 | functions to be included or excluded. These options can be |
| 201 | specified multiple times, with different symspecs, to include |
| 202 | or exclude sets of symbols. |
| 203 | .PP |
| 204 | Specifying any of these options overrides the default (\fB\-p \-q\fR), |
| 205 | which prints a flat profile and call graph analysis |
| 206 | for all functions. |
| 207 | .ie n .IP """\-A[\f(CIsymspec\f(CW]""" 4 |
| 208 | .el .IP "\f(CW\-A[\f(CIsymspec\f(CW]\fR" 4 |
| 209 | .IX Item "-A[symspec]" |
| 210 | .PD 0 |
| 211 | .ie n .IP """\-\-annotated\-source[=\f(CIsymspec\f(CW]""" 4 |
| 212 | .el .IP "\f(CW\-\-annotated\-source[=\f(CIsymspec\f(CW]\fR" 4 |
| 213 | .IX Item "--annotated-source[=symspec]" |
| 214 | .PD |
| 215 | The \fB\-A\fR option causes \f(CW\*(C`gprof\*(C'\fR to print annotated source code. |
| 216 | If \fIsymspec\fR is specified, print output only for matching symbols. |
| 217 | .ie n .IP """\-b""" 4 |
| 218 | .el .IP "\f(CW\-b\fR" 4 |
| 219 | .IX Item "-b" |
| 220 | .PD 0 |
| 221 | .ie n .IP """\-\-brief""" 4 |
| 222 | .el .IP "\f(CW\-\-brief\fR" 4 |
| 223 | .IX Item "--brief" |
| 224 | .PD |
| 225 | If the \fB\-b\fR option is given, \f(CW\*(C`gprof\*(C'\fR doesn't print the |
| 226 | verbose blurbs that try to explain the meaning of all of the fields in |
| 227 | the tables. This is useful if you intend to print out the output, or |
| 228 | are tired of seeing the blurbs. |
| 229 | .ie n .IP """\-C[\f(CIsymspec\f(CW]""" 4 |
| 230 | .el .IP "\f(CW\-C[\f(CIsymspec\f(CW]\fR" 4 |
| 231 | .IX Item "-C[symspec]" |
| 232 | .PD 0 |
| 233 | .ie n .IP """\-\-exec\-counts[=\f(CIsymspec\f(CW]""" 4 |
| 234 | .el .IP "\f(CW\-\-exec\-counts[=\f(CIsymspec\f(CW]\fR" 4 |
| 235 | .IX Item "--exec-counts[=symspec]" |
| 236 | .PD |
| 237 | The \fB\-C\fR option causes \f(CW\*(C`gprof\*(C'\fR to |
| 238 | print a tally of functions and the number of times each was called. |
| 239 | If \fIsymspec\fR is specified, print tally only for matching symbols. |
| 240 | .Sp |
| 241 | If the profile data file contains basic-block count records, specifying |
| 242 | the \fB\-l\fR option, along with \fB\-C\fR, will cause basic-block |
| 243 | execution counts to be tallied and displayed. |
| 244 | .ie n .IP """\-i""" 4 |
| 245 | .el .IP "\f(CW\-i\fR" 4 |
| 246 | .IX Item "-i" |
| 247 | .PD 0 |
| 248 | .ie n .IP """\-\-file\-info""" 4 |
| 249 | .el .IP "\f(CW\-\-file\-info\fR" 4 |
| 250 | .IX Item "--file-info" |
| 251 | .PD |
| 252 | The \fB\-i\fR option causes \f(CW\*(C`gprof\*(C'\fR to display summary information |
| 253 | about the profile data file(s) and then exit. The number of histogram, |
| 254 | call graph, and basic-block count records is displayed. |
| 255 | .ie n .IP """\-I \f(CIdirs\f(CW""" 4 |
| 256 | .el .IP "\f(CW\-I \f(CIdirs\f(CW\fR" 4 |
| 257 | .IX Item "-I dirs" |
| 258 | .PD 0 |
| 259 | .ie n .IP """\-\-directory\-path=\f(CIdirs\f(CW""" 4 |
| 260 | .el .IP "\f(CW\-\-directory\-path=\f(CIdirs\f(CW\fR" 4 |
| 261 | .IX Item "--directory-path=dirs" |
| 262 | .PD |
| 263 | The \fB\-I\fR option specifies a list of search directories in |
| 264 | which to find source files. Environment variable \fI\s-1GPROF_PATH\s0\fR |
| 265 | can also be used to convey this information. |
| 266 | Used mostly for annotated source output. |
| 267 | .ie n .IP """\-J[\f(CIsymspec\f(CW]""" 4 |
| 268 | .el .IP "\f(CW\-J[\f(CIsymspec\f(CW]\fR" 4 |
| 269 | .IX Item "-J[symspec]" |
| 270 | .PD 0 |
| 271 | .ie n .IP """\-\-no\-annotated\-source[=\f(CIsymspec\f(CW]""" 4 |
| 272 | .el .IP "\f(CW\-\-no\-annotated\-source[=\f(CIsymspec\f(CW]\fR" 4 |
| 273 | .IX Item "--no-annotated-source[=symspec]" |
| 274 | .PD |
| 275 | The \fB\-J\fR option causes \f(CW\*(C`gprof\*(C'\fR not to |
| 276 | print annotated source code. |
| 277 | If \fIsymspec\fR is specified, \f(CW\*(C`gprof\*(C'\fR prints annotated source, |
| 278 | but excludes matching symbols. |
| 279 | .ie n .IP """\-L""" 4 |
| 280 | .el .IP "\f(CW\-L\fR" 4 |
| 281 | .IX Item "-L" |
| 282 | .PD 0 |
| 283 | .ie n .IP """\-\-print\-path""" 4 |
| 284 | .el .IP "\f(CW\-\-print\-path\fR" 4 |
| 285 | .IX Item "--print-path" |
| 286 | .PD |
| 287 | Normally, source filenames are printed with the path |
| 288 | component suppressed. The \fB\-L\fR option causes \f(CW\*(C`gprof\*(C'\fR |
| 289 | to print the full pathname of |
| 290 | source filenames, which is determined |
| 291 | from symbolic debugging information in the image file |
| 292 | and is relative to the directory in which the compiler |
| 293 | was invoked. |
| 294 | .ie n .IP """\-p[\f(CIsymspec\f(CW]""" 4 |
| 295 | .el .IP "\f(CW\-p[\f(CIsymspec\f(CW]\fR" 4 |
| 296 | .IX Item "-p[symspec]" |
| 297 | .PD 0 |
| 298 | .ie n .IP """\-\-flat\-profile[=\f(CIsymspec\f(CW]""" 4 |
| 299 | .el .IP "\f(CW\-\-flat\-profile[=\f(CIsymspec\f(CW]\fR" 4 |
| 300 | .IX Item "--flat-profile[=symspec]" |
| 301 | .PD |
| 302 | The \fB\-p\fR option causes \f(CW\*(C`gprof\*(C'\fR to print a flat profile. |
| 303 | If \fIsymspec\fR is specified, print flat profile only for matching symbols. |
| 304 | .ie n .IP """\-P[\f(CIsymspec\f(CW]""" 4 |
| 305 | .el .IP "\f(CW\-P[\f(CIsymspec\f(CW]\fR" 4 |
| 306 | .IX Item "-P[symspec]" |
| 307 | .PD 0 |
| 308 | .ie n .IP """\-\-no\-flat\-profile[=\f(CIsymspec\f(CW]""" 4 |
| 309 | .el .IP "\f(CW\-\-no\-flat\-profile[=\f(CIsymspec\f(CW]\fR" 4 |
| 310 | .IX Item "--no-flat-profile[=symspec]" |
| 311 | .PD |
| 312 | The \fB\-P\fR option causes \f(CW\*(C`gprof\*(C'\fR to suppress printing a flat profile. |
| 313 | If \fIsymspec\fR is specified, \f(CW\*(C`gprof\*(C'\fR prints a flat profile, |
| 314 | but excludes matching symbols. |
| 315 | .ie n .IP """\-q[\f(CIsymspec\f(CW]""" 4 |
| 316 | .el .IP "\f(CW\-q[\f(CIsymspec\f(CW]\fR" 4 |
| 317 | .IX Item "-q[symspec]" |
| 318 | .PD 0 |
| 319 | .ie n .IP """\-\-graph[=\f(CIsymspec\f(CW]""" 4 |
| 320 | .el .IP "\f(CW\-\-graph[=\f(CIsymspec\f(CW]\fR" 4 |
| 321 | .IX Item "--graph[=symspec]" |
| 322 | .PD |
| 323 | The \fB\-q\fR option causes \f(CW\*(C`gprof\*(C'\fR to print the call graph analysis. |
| 324 | If \fIsymspec\fR is specified, print call graph only for matching symbols |
| 325 | and their children. |
| 326 | .ie n .IP """\-Q[\f(CIsymspec\f(CW]""" 4 |
| 327 | .el .IP "\f(CW\-Q[\f(CIsymspec\f(CW]\fR" 4 |
| 328 | .IX Item "-Q[symspec]" |
| 329 | .PD 0 |
| 330 | .ie n .IP """\-\-no\-graph[=\f(CIsymspec\f(CW]""" 4 |
| 331 | .el .IP "\f(CW\-\-no\-graph[=\f(CIsymspec\f(CW]\fR" 4 |
| 332 | .IX Item "--no-graph[=symspec]" |
| 333 | .PD |
| 334 | The \fB\-Q\fR option causes \f(CW\*(C`gprof\*(C'\fR to suppress printing the |
| 335 | call graph. |
| 336 | If \fIsymspec\fR is specified, \f(CW\*(C`gprof\*(C'\fR prints a call graph, |
| 337 | but excludes matching symbols. |
| 338 | .ie n .IP """\-t""" 4 |
| 339 | .el .IP "\f(CW\-t\fR" 4 |
| 340 | .IX Item "-t" |
| 341 | .PD 0 |
| 342 | .ie n .IP """\-\-table\-length=\f(CInum\f(CW""" 4 |
| 343 | .el .IP "\f(CW\-\-table\-length=\f(CInum\f(CW\fR" 4 |
| 344 | .IX Item "--table-length=num" |
| 345 | .PD |
| 346 | The \fB\-t\fR option causes the \fInum\fR most active source lines in |
| 347 | each source file to be listed when source annotation is enabled. The |
| 348 | default is 10. |
| 349 | .ie n .IP """\-y""" 4 |
| 350 | .el .IP "\f(CW\-y\fR" 4 |
| 351 | .IX Item "-y" |
| 352 | .PD 0 |
| 353 | .ie n .IP """\-\-separate\-files""" 4 |
| 354 | .el .IP "\f(CW\-\-separate\-files\fR" 4 |
| 355 | .IX Item "--separate-files" |
| 356 | .PD |
| 357 | This option affects annotated source output only. |
| 358 | Normally, \f(CW\*(C`gprof\*(C'\fR prints annotated source files |
| 359 | to standard-output. If this option is specified, |
| 360 | annotated source for a file named \fIpath/\fIfilename\fI\fR |
| 361 | is generated in the file \fI\fIfilename\fI\-ann\fR. If the underlying |
| 362 | file system would truncate \fI\fIfilename\fI\-ann\fR so that it |
| 363 | overwrites the original \fI\fIfilename\fI\fR, \f(CW\*(C`gprof\*(C'\fR generates |
| 364 | annotated source in the file \fI\fIfilename\fI.ann\fR instead (if the |
| 365 | original file name has an extension, that extension is \fIreplaced\fR |
| 366 | with \fI.ann\fR). |
| 367 | .ie n .IP """\-Z[\f(CIsymspec\f(CW]""" 4 |
| 368 | .el .IP "\f(CW\-Z[\f(CIsymspec\f(CW]\fR" 4 |
| 369 | .IX Item "-Z[symspec]" |
| 370 | .PD 0 |
| 371 | .ie n .IP """\-\-no\-exec\-counts[=\f(CIsymspec\f(CW]""" 4 |
| 372 | .el .IP "\f(CW\-\-no\-exec\-counts[=\f(CIsymspec\f(CW]\fR" 4 |
| 373 | .IX Item "--no-exec-counts[=symspec]" |
| 374 | .PD |
| 375 | The \fB\-Z\fR option causes \f(CW\*(C`gprof\*(C'\fR not to |
| 376 | print a tally of functions and the number of times each was called. |
| 377 | If \fIsymspec\fR is specified, print tally, but exclude matching symbols. |
| 378 | .ie n .IP """\-r""" 4 |
| 379 | .el .IP "\f(CW\-r\fR" 4 |
| 380 | .IX Item "-r" |
| 381 | .PD 0 |
| 382 | .ie n .IP """\-\-function\-ordering""" 4 |
| 383 | .el .IP "\f(CW\-\-function\-ordering\fR" 4 |
| 384 | .IX Item "--function-ordering" |
| 385 | .PD |
| 386 | The \fB\-\-function\-ordering\fR option causes \f(CW\*(C`gprof\*(C'\fR to print a |
| 387 | suggested function ordering for the program based on profiling data. |
| 388 | This option suggests an ordering which may improve paging, tlb and |
| 389 | cache behavior for the program on systems which support arbitrary |
| 390 | ordering of functions in an executable. |
| 391 | .Sp |
| 392 | The exact details of how to force the linker to place functions |
| 393 | in a particular order is system dependent and out of the scope of this |
| 394 | manual. |
| 395 | .ie n .IP """\-R \f(CImap_file\f(CW""" 4 |
| 396 | .el .IP "\f(CW\-R \f(CImap_file\f(CW\fR" 4 |
| 397 | .IX Item "-R map_file" |
| 398 | .PD 0 |
| 399 | .ie n .IP """\-\-file\-ordering \f(CImap_file\f(CW""" 4 |
| 400 | .el .IP "\f(CW\-\-file\-ordering \f(CImap_file\f(CW\fR" 4 |
| 401 | .IX Item "--file-ordering map_file" |
| 402 | .PD |
| 403 | The \fB\-\-file\-ordering\fR option causes \f(CW\*(C`gprof\*(C'\fR to print a |
| 404 | suggested .o link line ordering for the program based on profiling data. |
| 405 | This option suggests an ordering which may improve paging, tlb and |
| 406 | cache behavior for the program on systems which do not support arbitrary |
| 407 | ordering of functions in an executable. |
| 408 | .Sp |
| 409 | Use of the \fB\-a\fR argument is highly recommended with this option. |
| 410 | .Sp |
| 411 | The \fImap_file\fR argument is a pathname to a file which provides |
| 412 | function name to object file mappings. The format of the file is similar to |
| 413 | the output of the program \f(CW\*(C`nm\*(C'\fR. |
| 414 | .Sp |
| 415 | .Vb 8 |
| 416 | \& c\-parse.o:00000000 T yyparse |
| 417 | \& c\-parse.o:00000004 C yyerrflag |
| 418 | \& c\-lang.o:00000000 T maybe_objc_method_name |
| 419 | \& c\-lang.o:00000000 T print_lang_statistics |
| 420 | \& c\-lang.o:00000000 T recognize_objc_keyword |
| 421 | \& c\-decl.o:00000000 T print_lang_identifier |
| 422 | \& c\-decl.o:00000000 T print_lang_type |
| 423 | \& ... |
| 424 | .Ve |
| 425 | .Sp |
| 426 | To create a \fImap_file\fR with \s-1GNU \s0\f(CW\*(C`nm\*(C'\fR, type a command like |
| 427 | \&\f(CW\*(C`nm \-\-extern\-only \-\-defined\-only \-v \-\-print\-file\-name program\-name\*(C'\fR. |
| 428 | .ie n .IP """\-T""" 4 |
| 429 | .el .IP "\f(CW\-T\fR" 4 |
| 430 | .IX Item "-T" |
| 431 | .PD 0 |
| 432 | .ie n .IP """\-\-traditional""" 4 |
| 433 | .el .IP "\f(CW\-\-traditional\fR" 4 |
| 434 | .IX Item "--traditional" |
| 435 | .PD |
| 436 | The \fB\-T\fR option causes \f(CW\*(C`gprof\*(C'\fR to print its output in |
| 437 | \&\*(L"traditional\*(R" \s-1BSD\s0 style. |
| 438 | .ie n .IP """\-w \f(CIwidth\f(CW""" 4 |
| 439 | .el .IP "\f(CW\-w \f(CIwidth\f(CW\fR" 4 |
| 440 | .IX Item "-w width" |
| 441 | .PD 0 |
| 442 | .ie n .IP """\-\-width=\f(CIwidth\f(CW""" 4 |
| 443 | .el .IP "\f(CW\-\-width=\f(CIwidth\f(CW\fR" 4 |
| 444 | .IX Item "--width=width" |
| 445 | .PD |
| 446 | Sets width of output lines to \fIwidth\fR. |
| 447 | Currently only used when printing the function index at the bottom |
| 448 | of the call graph. |
| 449 | .ie n .IP """\-x""" 4 |
| 450 | .el .IP "\f(CW\-x\fR" 4 |
| 451 | .IX Item "-x" |
| 452 | .PD 0 |
| 453 | .ie n .IP """\-\-all\-lines""" 4 |
| 454 | .el .IP "\f(CW\-\-all\-lines\fR" 4 |
| 455 | .IX Item "--all-lines" |
| 456 | .PD |
| 457 | This option affects annotated source output only. |
| 458 | By default, only the lines at the beginning of a basic-block |
| 459 | are annotated. If this option is specified, every line in |
| 460 | a basic-block is annotated by repeating the annotation for the |
| 461 | first line. This behavior is similar to \f(CW\*(C`tcov\*(C'\fR's \fB\-a\fR. |
| 462 | .ie n .IP """\-\-demangle[=\f(CIstyle\f(CW]""" 4 |
| 463 | .el .IP "\f(CW\-\-demangle[=\f(CIstyle\f(CW]\fR" 4 |
| 464 | .IX Item "--demangle[=style]" |
| 465 | .PD 0 |
| 466 | .ie n .IP """\-\-no\-demangle""" 4 |
| 467 | .el .IP "\f(CW\-\-no\-demangle\fR" 4 |
| 468 | .IX Item "--no-demangle" |
| 469 | .PD |
| 470 | These options control whether \*(C+ symbol names should be demangled when |
| 471 | printing output. The default is to demangle symbols. The |
| 472 | \&\f(CW\*(C`\-\-no\-demangle\*(C'\fR option may be used to turn off demangling. Different |
| 473 | compilers have different mangling styles. The optional demangling style |
| 474 | argument can be used to choose an appropriate demangling style for your |
| 475 | compiler. |
| 476 | .SS "Analysis Options" |
| 477 | .IX Subsection "Analysis Options" |
| 478 | .ie n .IP """\-a""" 4 |
| 479 | .el .IP "\f(CW\-a\fR" 4 |
| 480 | .IX Item "-a" |
| 481 | .PD 0 |
| 482 | .ie n .IP """\-\-no\-static""" 4 |
| 483 | .el .IP "\f(CW\-\-no\-static\fR" 4 |
| 484 | .IX Item "--no-static" |
| 485 | .PD |
| 486 | The \fB\-a\fR option causes \f(CW\*(C`gprof\*(C'\fR to suppress the printing of |
| 487 | statically declared (private) functions. (These are functions whose |
| 488 | names are not listed as global, and which are not visible outside the |
| 489 | file/function/block where they were defined.) Time spent in these |
| 490 | functions, calls to/from them, etc., will all be attributed to the |
| 491 | function that was loaded directly before it in the executable file. |
| 492 | This option affects both the flat profile and the call graph. |
| 493 | .ie n .IP """\-c""" 4 |
| 494 | .el .IP "\f(CW\-c\fR" 4 |
| 495 | .IX Item "-c" |
| 496 | .PD 0 |
| 497 | .ie n .IP """\-\-static\-call\-graph""" 4 |
| 498 | .el .IP "\f(CW\-\-static\-call\-graph\fR" 4 |
| 499 | .IX Item "--static-call-graph" |
| 500 | .PD |
| 501 | The \fB\-c\fR option causes the call graph of the program to be |
| 502 | augmented by a heuristic which examines the text space of the object |
| 503 | file and identifies function calls in the binary machine code. |
| 504 | Since normal call graph records are only generated when functions are |
| 505 | entered, this option identifies children that could have been called, |
| 506 | but never were. Calls to functions that were not compiled with |
| 507 | profiling enabled are also identified, but only if symbol table |
| 508 | entries are present for them. |
| 509 | Calls to dynamic library routines are typically \fInot\fR found |
| 510 | by this option. |
| 511 | Parents or children identified via this heuristic |
| 512 | are indicated in the call graph with call counts of \fB0\fR. |
| 513 | .ie n .IP """\-D""" 4 |
| 514 | .el .IP "\f(CW\-D\fR" 4 |
| 515 | .IX Item "-D" |
| 516 | .PD 0 |
| 517 | .ie n .IP """\-\-ignore\-non\-functions""" 4 |
| 518 | .el .IP "\f(CW\-\-ignore\-non\-functions\fR" 4 |
| 519 | .IX Item "--ignore-non-functions" |
| 520 | .PD |
| 521 | The \fB\-D\fR option causes \f(CW\*(C`gprof\*(C'\fR to ignore symbols which |
| 522 | are not known to be functions. This option will give more accurate |
| 523 | profile data on systems where it is supported (Solaris and \s-1HPUX\s0 for |
| 524 | example). |
| 525 | .ie n .IP """\-k \f(CIfrom\f(CW/\f(CIto\f(CW""" 4 |
| 526 | .el .IP "\f(CW\-k \f(CIfrom\f(CW/\f(CIto\f(CW\fR" 4 |
| 527 | .IX Item "-k from/to" |
| 528 | The \fB\-k\fR option allows you to delete from the call graph any arcs from |
| 529 | symbols matching symspec \fIfrom\fR to those matching symspec \fIto\fR. |
| 530 | .ie n .IP """\-l""" 4 |
| 531 | .el .IP "\f(CW\-l\fR" 4 |
| 532 | .IX Item "-l" |
| 533 | .PD 0 |
| 534 | .ie n .IP """\-\-line""" 4 |
| 535 | .el .IP "\f(CW\-\-line\fR" 4 |
| 536 | .IX Item "--line" |
| 537 | .PD |
| 538 | The \fB\-l\fR option enables line-by-line profiling, which causes |
| 539 | histogram hits to be charged to individual source code lines, |
| 540 | instead of functions. This feature only works with programs compiled |
| 541 | by older versions of the \f(CW\*(C`gcc\*(C'\fR compiler. Newer versions of |
| 542 | \&\f(CW\*(C`gcc\*(C'\fR are designed to work with the \f(CW\*(C`gcov\*(C'\fR tool instead. |
| 543 | .Sp |
| 544 | If the program was compiled with basic-block counting enabled, |
| 545 | this option will also identify how many times each line of |
| 546 | code was executed. |
| 547 | While line-by-line profiling can help isolate where in a large function |
| 548 | a program is spending its time, it also significantly increases |
| 549 | the running time of \f(CW\*(C`gprof\*(C'\fR, and magnifies statistical |
| 550 | inaccuracies. |
| 551 | .ie n .IP """\-\-inline\-file\-names""" 4 |
| 552 | .el .IP "\f(CW\-\-inline\-file\-names\fR" 4 |
| 553 | .IX Item "--inline-file-names" |
| 554 | This option causes \f(CW\*(C`gprof\*(C'\fR to print the source file after each |
| 555 | symbol in both the flat profile and the call graph. The full path to the |
| 556 | file is printed if used with the \fB\-L\fR option. |
| 557 | .ie n .IP """\-m \f(CInum\f(CW""" 4 |
| 558 | .el .IP "\f(CW\-m \f(CInum\f(CW\fR" 4 |
| 559 | .IX Item "-m num" |
| 560 | .PD 0 |
| 561 | .ie n .IP """\-\-min\-count=\f(CInum\f(CW""" 4 |
| 562 | .el .IP "\f(CW\-\-min\-count=\f(CInum\f(CW\fR" 4 |
| 563 | .IX Item "--min-count=num" |
| 564 | .PD |
| 565 | This option affects execution count output only. |
| 566 | Symbols that are executed less than \fInum\fR times are suppressed. |
| 567 | .ie n .IP """\-n\f(CIsymspec\f(CW""" 4 |
| 568 | .el .IP "\f(CW\-n\f(CIsymspec\f(CW\fR" 4 |
| 569 | .IX Item "-nsymspec" |
| 570 | .PD 0 |
| 571 | .ie n .IP """\-\-time=\f(CIsymspec\f(CW""" 4 |
| 572 | .el .IP "\f(CW\-\-time=\f(CIsymspec\f(CW\fR" 4 |
| 573 | .IX Item "--time=symspec" |
| 574 | .PD |
| 575 | The \fB\-n\fR option causes \f(CW\*(C`gprof\*(C'\fR, in its call graph analysis, |
| 576 | to only propagate times for symbols matching \fIsymspec\fR. |
| 577 | .ie n .IP """\-N\f(CIsymspec\f(CW""" 4 |
| 578 | .el .IP "\f(CW\-N\f(CIsymspec\f(CW\fR" 4 |
| 579 | .IX Item "-Nsymspec" |
| 580 | .PD 0 |
| 581 | .ie n .IP """\-\-no\-time=\f(CIsymspec\f(CW""" 4 |
| 582 | .el .IP "\f(CW\-\-no\-time=\f(CIsymspec\f(CW\fR" 4 |
| 583 | .IX Item "--no-time=symspec" |
| 584 | .PD |
| 585 | The \fB\-n\fR option causes \f(CW\*(C`gprof\*(C'\fR, in its call graph analysis, |
| 586 | not to propagate times for symbols matching \fIsymspec\fR. |
| 587 | .ie n .IP """\-S\f(CIfilename\f(CW""" 4 |
| 588 | .el .IP "\f(CW\-S\f(CIfilename\f(CW\fR" 4 |
| 589 | .IX Item "-Sfilename" |
| 590 | .PD 0 |
| 591 | .ie n .IP """\-\-external\-symbol\-table=\f(CIfilename\f(CW""" 4 |
| 592 | .el .IP "\f(CW\-\-external\-symbol\-table=\f(CIfilename\f(CW\fR" 4 |
| 593 | .IX Item "--external-symbol-table=filename" |
| 594 | .PD |
| 595 | The \fB\-S\fR option causes \f(CW\*(C`gprof\*(C'\fR to read an external symbol table |
| 596 | file, such as \fI/proc/kallsyms\fR, rather than read the symbol table |
| 597 | from the given object file (the default is \f(CW\*(C`a.out\*(C'\fR). This is useful |
| 598 | for profiling kernel modules. |
| 599 | .ie n .IP """\-z""" 4 |
| 600 | .el .IP "\f(CW\-z\fR" 4 |
| 601 | .IX Item "-z" |
| 602 | .PD 0 |
| 603 | .ie n .IP """\-\-display\-unused\-functions""" 4 |
| 604 | .el .IP "\f(CW\-\-display\-unused\-functions\fR" 4 |
| 605 | .IX Item "--display-unused-functions" |
| 606 | .PD |
| 607 | If you give the \fB\-z\fR option, \f(CW\*(C`gprof\*(C'\fR will mention all |
| 608 | functions in the flat profile, even those that were never called, and |
| 609 | that had no time spent in them. This is useful in conjunction with the |
| 610 | \&\fB\-c\fR option for discovering which routines were never called. |
| 611 | .SS "Miscellaneous Options" |
| 612 | .IX Subsection "Miscellaneous Options" |
| 613 | .ie n .IP """\-d[\f(CInum\f(CW]""" 4 |
| 614 | .el .IP "\f(CW\-d[\f(CInum\f(CW]\fR" 4 |
| 615 | .IX Item "-d[num]" |
| 616 | .PD 0 |
| 617 | .ie n .IP """\-\-debug[=\f(CInum\f(CW]""" 4 |
| 618 | .el .IP "\f(CW\-\-debug[=\f(CInum\f(CW]\fR" 4 |
| 619 | .IX Item "--debug[=num]" |
| 620 | .PD |
| 621 | The \fB\-d\fR \fInum\fR option specifies debugging options. |
| 622 | If \fInum\fR is not specified, enable all debugging. |
| 623 | .ie n .IP """\-h""" 4 |
| 624 | .el .IP "\f(CW\-h\fR" 4 |
| 625 | .IX Item "-h" |
| 626 | .PD 0 |
| 627 | .ie n .IP """\-\-help""" 4 |
| 628 | .el .IP "\f(CW\-\-help\fR" 4 |
| 629 | .IX Item "--help" |
| 630 | .PD |
| 631 | The \fB\-h\fR option prints command line usage. |
| 632 | .ie n .IP """\-O\f(CIname\f(CW""" 4 |
| 633 | .el .IP "\f(CW\-O\f(CIname\f(CW\fR" 4 |
| 634 | .IX Item "-Oname" |
| 635 | .PD 0 |
| 636 | .ie n .IP """\-\-file\-format=\f(CIname\f(CW""" 4 |
| 637 | .el .IP "\f(CW\-\-file\-format=\f(CIname\f(CW\fR" 4 |
| 638 | .IX Item "--file-format=name" |
| 639 | .PD |
| 640 | Selects the format of the profile data files. Recognized formats are |
| 641 | \&\fBauto\fR (the default), \fBbsd\fR, \fB4.4bsd\fR, \fBmagic\fR, and |
| 642 | \&\fBprof\fR (not yet supported). |
| 643 | .ie n .IP """\-s""" 4 |
| 644 | .el .IP "\f(CW\-s\fR" 4 |
| 645 | .IX Item "-s" |
| 646 | .PD 0 |
| 647 | .ie n .IP """\-\-sum""" 4 |
| 648 | .el .IP "\f(CW\-\-sum\fR" 4 |
| 649 | .IX Item "--sum" |
| 650 | .PD |
| 651 | The \fB\-s\fR option causes \f(CW\*(C`gprof\*(C'\fR to summarize the information |
| 652 | in the profile data files it read in, and write out a profile data |
| 653 | file called \fIgmon.sum\fR, which contains all the information from |
| 654 | the profile data files that \f(CW\*(C`gprof\*(C'\fR read in. The file \fIgmon.sum\fR |
| 655 | may be one of the specified input files; the effect of this is to |
| 656 | merge the data in the other input files into \fIgmon.sum\fR. |
| 657 | .Sp |
| 658 | Eventually you can run \f(CW\*(C`gprof\*(C'\fR again without \fB\-s\fR to analyze the |
| 659 | cumulative data in the file \fIgmon.sum\fR. |
| 660 | .ie n .IP """\-v""" 4 |
| 661 | .el .IP "\f(CW\-v\fR" 4 |
| 662 | .IX Item "-v" |
| 663 | .PD 0 |
| 664 | .ie n .IP """\-\-version""" 4 |
| 665 | .el .IP "\f(CW\-\-version\fR" 4 |
| 666 | .IX Item "--version" |
| 667 | .PD |
| 668 | The \fB\-v\fR flag causes \f(CW\*(C`gprof\*(C'\fR to print the current version |
| 669 | number, and then exit. |
| 670 | .SS "Deprecated Options" |
| 671 | .IX Subsection "Deprecated Options" |
| 672 | These options have been replaced with newer versions that use symspecs. |
| 673 | .ie n .IP """\-e \f(CIfunction_name\f(CW""" 4 |
| 674 | .el .IP "\f(CW\-e \f(CIfunction_name\f(CW\fR" 4 |
| 675 | .IX Item "-e function_name" |
| 676 | The \fB\-e\fR \fIfunction\fR option tells \f(CW\*(C`gprof\*(C'\fR to not print |
| 677 | information about the function \fIfunction_name\fR (and its |
| 678 | children...) in the call graph. The function will still be listed |
| 679 | as a child of any functions that call it, but its index number will be |
| 680 | shown as \fB[not printed]\fR. More than one \fB\-e\fR option may be |
| 681 | given; only one \fIfunction_name\fR may be indicated with each \fB\-e\fR |
| 682 | option. |
| 683 | .ie n .IP """\-E \f(CIfunction_name\f(CW""" 4 |
| 684 | .el .IP "\f(CW\-E \f(CIfunction_name\f(CW\fR" 4 |
| 685 | .IX Item "-E function_name" |
| 686 | The \f(CW\*(C`\-E \f(CIfunction\f(CW\*(C'\fR option works like the \f(CW\*(C`\-e\*(C'\fR option, but |
| 687 | time spent in the function (and children who were not called from |
| 688 | anywhere else), will not be used to compute the percentages-of-time for |
| 689 | the call graph. More than one \fB\-E\fR option may be given; only one |
| 690 | \&\fIfunction_name\fR may be indicated with each \fB\-E\fR option. |
| 691 | .ie n .IP """\-f \f(CIfunction_name\f(CW""" 4 |
| 692 | .el .IP "\f(CW\-f \f(CIfunction_name\f(CW\fR" 4 |
| 693 | .IX Item "-f function_name" |
| 694 | The \fB\-f\fR \fIfunction\fR option causes \f(CW\*(C`gprof\*(C'\fR to limit the |
| 695 | call graph to the function \fIfunction_name\fR and its children (and |
| 696 | their children...). More than one \fB\-f\fR option may be given; |
| 697 | only one \fIfunction_name\fR may be indicated with each \fB\-f\fR |
| 698 | option. |
| 699 | .ie n .IP """\-F \f(CIfunction_name\f(CW""" 4 |
| 700 | .el .IP "\f(CW\-F \f(CIfunction_name\f(CW\fR" 4 |
| 701 | .IX Item "-F function_name" |
| 702 | The \fB\-F\fR \fIfunction\fR option works like the \f(CW\*(C`\-f\*(C'\fR option, but |
| 703 | only time spent in the function and its children (and their |
| 704 | children...) will be used to determine total-time and |
| 705 | percentages-of-time for the call graph. More than one \fB\-F\fR option |
| 706 | may be given; only one \fIfunction_name\fR may be indicated with each |
| 707 | \&\fB\-F\fR option. The \fB\-F\fR option overrides the \fB\-E\fR option. |
| 708 | .SH "FILES" |
| 709 | .IX Header "FILES" |
| 710 | .ie n .IP """\f(CIa.out\f(CW""" 4 |
| 711 | .el .IP "\f(CW\f(CIa.out\f(CW\fR" 4 |
| 712 | .IX Item "a.out" |
| 713 | the namelist and text space. |
| 714 | .ie n .IP """\f(CIgmon.out\f(CW""" 4 |
| 715 | .el .IP "\f(CW\f(CIgmon.out\f(CW\fR" 4 |
| 716 | .IX Item "gmon.out" |
| 717 | dynamic call graph and profile. |
| 718 | .ie n .IP """\f(CIgmon.sum\f(CW""" 4 |
| 719 | .el .IP "\f(CW\f(CIgmon.sum\f(CW\fR" 4 |
| 720 | .IX Item "gmon.sum" |
| 721 | summarized dynamic call graph and profile. |
| 722 | .SH "BUGS" |
| 723 | .IX Header "BUGS" |
| 724 | The granularity of the sampling is shown, but remains |
| 725 | statistical at best. |
| 726 | We assume that the time for each execution of a function |
| 727 | can be expressed by the total time for the function divided |
| 728 | by the number of times the function is called. |
| 729 | Thus the time propagated along the call graph arcs to the function's |
| 730 | parents is directly proportional to the number of times that |
| 731 | arc is traversed. |
| 732 | .PP |
| 733 | Parents that are not themselves profiled will have the time of |
| 734 | their profiled children propagated to them, but they will appear |
| 735 | to be spontaneously invoked in the call graph listing, and will |
| 736 | not have their time propagated further. |
| 737 | Similarly, signal catchers, even though profiled, will appear |
| 738 | to be spontaneous (although for more obscure reasons). |
| 739 | Any profiled children of signal catchers should have their times |
| 740 | propagated properly, unless the signal catcher was invoked during |
| 741 | the execution of the profiling routine, in which case all is lost. |
| 742 | .PP |
| 743 | The profiled program must call \f(CW\*(C`exit\*(C'\fR(2) |
| 744 | or return normally for the profiling information to be saved |
| 745 | in the \fIgmon.out\fR file. |
| 746 | .SH "SEE ALSO" |
| 747 | .IX Header "SEE ALSO" |
| 748 | \&\fImonitor\fR\|(3), \fIprofil\fR\|(2), \fIcc\fR\|(1), \fIprof\fR\|(1), and the Info entry for \fIgprof\fR. |
| 749 | .PP |
| 750 | \&\*(L"An Execution Profiler for Modular Programs\*(R", |
| 751 | by S. Graham, P. Kessler, M. McKusick; |
| 752 | Software \- Practice and Experience, |
| 753 | Vol. 13, pp. 671\-685, 1983. |
| 754 | .PP |
| 755 | \&\*(L"gprof: A Call Graph Execution Profiler\*(R", |
| 756 | by S. Graham, P. Kessler, M. McKusick; |
| 757 | Proceedings of the \s-1SIGPLAN \s0'82 Symposium on Compiler Construction, |
| 758 | \&\s-1SIGPLAN\s0 Notices, Vol. 17, No 6, pp. 120\-126, June 1982. |
| 759 | .SH "COPYRIGHT" |
| 760 | .IX Header "COPYRIGHT" |
| 761 | Copyright (c) 1988\-2016 Free Software Foundation, Inc. |
| 762 | .PP |
| 763 | Permission is granted to copy, distribute and/or modify this document |
| 764 | under the terms of the \s-1GNU\s0 Free Documentation License, Version 1.3 |
| 765 | or any later version published by the Free Software Foundation; |
| 766 | with no Invariant Sections, with no Front-Cover Texts, and with no |
| 767 | Back-Cover Texts. A copy of the license is included in the |
| 768 | section entitled \*(L"\s-1GNU\s0 Free Documentation License\*(R". |