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Diffstat (limited to 'chromium/third_party/cygwin/lib/perl5/5.10/i686-cygwin/Devel/DProf.pm')
| -rw-r--r-- | chromium/third_party/cygwin/lib/perl5/5.10/i686-cygwin/Devel/DProf.pm | 238 |
1 files changed, 0 insertions, 238 deletions
diff --git a/chromium/third_party/cygwin/lib/perl5/5.10/i686-cygwin/Devel/DProf.pm b/chromium/third_party/cygwin/lib/perl5/5.10/i686-cygwin/Devel/DProf.pm deleted file mode 100644 index 7405b78dcf7..00000000000 --- a/chromium/third_party/cygwin/lib/perl5/5.10/i686-cygwin/Devel/DProf.pm +++ /dev/null @@ -1,238 +0,0 @@ -use 5.006_001; - -=head1 NAME - -Devel::DProf - a Perl code profiler - -=head1 SYNOPSIS - - perl -d:DProf test.pl - -=head1 DESCRIPTION - -The Devel::DProf package is a Perl code profiler. This will collect -information on the execution time of a Perl script and of the subs in that -script. This information can be used to determine which subroutines are -using the most time and which subroutines are being called most often. This -information can also be used to create an execution graph of the script, -showing subroutine relationships. - -To profile a Perl script run the perl interpreter with the B<-d> debugging -switch. The profiler uses the debugging hooks. So to profile script -F<test.pl> the following command should be used: - - perl -d:DProf test.pl - -When the script terminates (or when the output buffer is filled) the -profiler will dump the profile information to a file called -F<tmon.out>. A tool like I<dprofpp> can be used to interpret the -information which is in that profile. The following command will -print the top 15 subroutines which used the most time: - - dprofpp - -To print an execution graph of the subroutines in the script use the -following command: - - dprofpp -T - -Consult L<dprofpp> for other options. - -=head1 PROFILE FORMAT - -The old profile is a text file which looks like this: - - #fOrTyTwO - $hz=100; - $XS_VERSION='DProf 19970606'; - # All values are given in HZ - $rrun_utime=2; $rrun_stime=0; $rrun_rtime=7 - PART2 - + 26 28 566822884 DynaLoader::import - - 26 28 566822884 DynaLoader::import - + 27 28 566822885 main::bar - - 27 28 566822886 main::bar - + 27 28 566822886 main::baz - + 27 28 566822887 main::bar - - 27 28 566822888 main::bar - [....] - -The first line is the magic number. The second line is the hertz value, or -clock ticks, of the machine where the profile was collected. The third line -is the name and version identifier of the tool which created the profile. -The fourth line is a comment. The fifth line contains three variables -holding the user time, system time, and realtime of the process while it was -being profiled. The sixth line indicates the beginning of the sub -entry/exit profile section. - -The columns in B<PART2> are: - - sub entry(+)/exit(-) mark - app's user time at sub entry/exit mark, in ticks - app's system time at sub entry/exit mark, in ticks - app's realtime at sub entry/exit mark, in ticks - fully-qualified sub name, when possible - -With newer perls another format is used, which may look like this: - - #fOrTyTwO - $hz=10000; - $XS_VERSION='DProf 19971213'; - # All values are given in HZ - $over_utime=5917; $over_stime=0; $over_rtime=5917; - $over_tests=10000; - $rrun_utime=1284; $rrun_stime=0; $rrun_rtime=1284; - $total_marks=6; - - PART2 - @ 406 0 406 - & 2 main bar - + 2 - @ 456 0 456 - - 2 - @ 1 0 1 - & 3 main baz - + 3 - @ 141 0 141 - + 2 - @ 141 0 141 - - 2 - @ 1 0 1 - & 4 main foo - + 4 - @ 142 0 142 - + & Devel::DProf::write - @ 5 0 5 - - & Devel::DProf::write - -(with high value of $ENV{PERL_DPROF_TICKS}). - -New C<$over_*> values show the measured overhead of making $over_tests -calls to the profiler These values are used by the profiler to -subtract the overhead from the runtimes. - -Lines starting with C<@> mark the amount of time passed since the -previous C<@> line. The numbers following the C<@> are integer tick -counts representing user, system, and real time. Divide these numbers -by the $hz value in the header to get seconds. - -Lines starting with C<&> map subroutine identifiers (an integer) to -subroutine packages and names. These should only occur once per -subroutine. - -Lines starting with C<+> or C<-> mark normal entering and exit of -subroutines. The number following is a reference to a subroutine -identifier. - -Lines starting with C<*> mark where subroutines are entered by C<goto -&subr>, but note that the return will still be marked as coming from -the original sub. The sequence might look like this: - - + 5 - * 6 - - 5 - -Lines starting with C</> is like C<-> but mark where subroutines are -exited by dying. Example: - - + 5 - + 6 - / 6 - / 5 - -Finally you might find C<@> time stamp marks surrounded by C<+ & -Devel::DProf::write> and C<- & Devel::DProf::write> lines. These 3 -lines are outputted when printing of the mark above actually consumed -measurable time. - -=head1 AUTOLOAD - -When Devel::DProf finds a call to an C<&AUTOLOAD> subroutine it looks at the -C<$AUTOLOAD> variable to find the real name of the sub being called. See -L<perlsub/"Autoloading">. - -=head1 ENVIRONMENT - -C<PERL_DPROF_BUFFER> sets size of output buffer in words. Defaults to 2**14. - -C<PERL_DPROF_TICKS> sets number of ticks per second on some systems where -a replacement for times() is used. Defaults to the value of C<HZ> macro. - -C<PERL_DPROF_OUT_FILE_NAME> sets the name of the output file. If not set, -defaults to tmon.out. - -=head1 BUGS - -Builtin functions cannot be measured by Devel::DProf. - -With a newer Perl DProf relies on the fact that the numeric slot of -$DB::sub contains an address of a subroutine. Excessive manipulation -of this variable may overwrite this slot, as in - - $DB::sub = 'current_sub'; - ... - $addr = $DB::sub + 0; - -will set this numeric slot to numeric value of the string -C<current_sub>, i.e., to C<0>. This will cause a segfault on the exit -from this subroutine. Note that the first assignment above does not -change the numeric slot (it will I<mark> it as invalid, but will not -write over it). - -Another problem is that if a subroutine exits using goto(LABEL), -last(LABEL) or next(LABEL) then perl may crash or Devel::DProf will die -with the error: - - panic: Devel::DProf inconsistent subroutine return - -For example, this code will break under Devel::DProf: - - sub foo { - last FOO; - } - FOO: { - foo(); - } - -A pattern like this is used by Test::More's skip() function, for -example. See L<perldiag> for more details. - -Mail bug reports and feature requests to the perl5-porters mailing list at -F<E<lt>perl5-porters@perl.orgE<gt>>. - -=head1 SEE ALSO - -L<perl>, L<dprofpp>, times(2) - -=cut - -# This sub is needed for calibration. -package Devel::DProf; - -sub NONESUCH_noxs { - return $Devel::DProf::VERSION; -} - -package DB; - -# -# As of perl5.003_20, &DB::sub stub is not needed (some versions -# even had problems if stub was redefined with XS version). -# - -# disable DB single-stepping -BEGIN { $single = 0; } - -# This sub is needed during startup. -sub DB { -# print "nonXS DBDB\n"; -} - -use XSLoader (); - -$Devel::DProf::VERSION = '20080331.00'; # this version not authorized by - # Dean Roehrich. See "Changes" file. - -XSLoader::load 'Devel::DProf', $Devel::DProf::VERSION; - -1; |