1DPROFPP(1) User Contributed Perl Documentation DPROFPP(1)
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6 dprofpp - display perl profile data
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9 dprofpp [-a|-z|-l|-v|-U] [-d] [-s|-r|-u] [-q] [-F] [-I|-E] [-O cnt]
10 [-A] [-R] [-S] [-g subroutine] [-G <regexp> [-P]] [-f <regexp>]
11 [profile]
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13 dprofpp -T [-F] [-g subroutine] [profile]
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15 dprofpp -t [-F] [-g subroutine] [profile]
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17 dprofpp -G <regexp> [-P] [profile]
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19 dprofpp -p script [-Q] [other opts]
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21 dprofpp -V [profile]
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24 The dprofpp command interprets profile data produced by a profiler,
25 such as the Devel::DProf profiler. Dprofpp will read the file tmon.out
26 and display the 15 subroutines which are using the most time. By
27 default the times for each subroutine are given exclusive of the times
28 of their child subroutines.
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30 To profile a Perl script run the perl interpreter with the -d switch.
31 So to profile script test.pl with Devel::DProf use the following:
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33 $ perl5 -d:DProf test.pl
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35 Then run dprofpp to analyze the profile. The output of dprofpp depends
36 on the flags to the program and the version of Perl you're using.
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38 $ dprofpp -u
39 Total Elapsed Time = 1.67 Seconds
40 User Time = 0.61 Seconds
41 Exclusive Times
42 %Time Seconds #Calls sec/call Name
43 52.4 0.320 2 0.1600 main::foo
44 45.9 0.280 200 0.0014 main::bar
45 0.00 0.000 1 0.0000 DynaLoader::import
46 0.00 0.000 1 0.0000 main::baz
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48 The dprofpp tool can also run the profiler before analyzing the profile
49 data. The above two commands can be executed with one dprofpp command.
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51 $ dprofpp -u -p test.pl
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53 Consult "PROFILE FORMAT" in Devel::DProf for a description of the raw
54 profile.
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57 Columns are:
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59 %Time
60 Percentage of time spent in this routine.
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62 #Calls
63 Number of calls to this routine.
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65 sec/call
66 Average number of seconds per call to this routine.
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68 Name
69 Name of routine.
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71 CumulS
72 Time (in seconds) spent in this routine and routines called from
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75 ExclSec
76 Time (in seconds) spent in this routine (not including those called
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79 Csec/c
80 Average time (in seconds) spent in each call of this routine
81 (including those called from it).
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84 -a Sort alphabetically by subroutine names.
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86 -d Reverse whatever sort is used
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88 -A Count timing for autoloaded subroutine as timing for *::AUTOLOAD.
89 Otherwise the time to autoload it is counted as time of the
90 subroutine itself (there is no way to separate autoload time from
91 run time).
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93 This is going to be irrelevant with newer Perls. They will inform
94 "Devel::DProf" when the "AUTOLOAD" switches to actual subroutine,
95 so a separate statistics for "AUTOLOAD" will be collected no
96 matter whether this option is set.
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98 -R Count anonymous subroutines defined in the same package
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101 -E (default) Display all subroutine times exclusive of child
102 subroutine times.
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104 -F Force the generation of fake exit timestamps if dprofpp reports
105 that the profile is garbled. This is only useful if dprofpp
106 determines that the profile is garbled due to missing exit
107 timestamps. You're on your own if you do this. Consult the BUGS
108 section.
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110 -I Display all subroutine times inclusive of child subroutine times.
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112 -l Sort by number of calls to the subroutines. This may help
113 identify candidates for inlining.
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115 -O cnt
116 Show only cnt subroutines. The default is 15.
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118 -p script
119 Tells dprofpp that it should profile the given script and then
120 interpret its profile data. See -Q.
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122 -Q Used with -p to tell dprofpp to quit after profiling the script,
123 without interpreting the data.
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125 -q Do not display column headers.
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127 -r Display elapsed real times rather than user+system times.
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129 -s Display system times rather than user+system times.
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131 -T Display subroutine call tree to stdout. Subroutine statistics are
132 not displayed.
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134 -t Display subroutine call tree to stdout. Subroutine statistics are
135 not displayed. When a function is called multiple consecutive
136 times at the same calling level then it is displayed once with a
137 repeat count.
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139 -S Display merged subroutine call tree to stdout. Statistics are
140 displayed for each branch of the tree.
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142 When a function is called multiple (not necessarily consecutive)
143 times in the same branch then all these calls go into one branch
144 of the next level. A repeat count is output together with
145 combined inclusive, exclusive and kids time.
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147 Branches are sorted with regard to inclusive time.
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149 -U Do not sort. Display in the order found in the raw profile.
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151 -u Display user times rather than user+system times.
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153 -V Print dprofpp's version number and exit. If a raw profile is
154 found then its XS_VERSION variable will be displayed, too.
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156 -v Sort by average time spent in subroutines during each call. This
157 may help identify candidates for inlining.
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159 -z (default) Sort by amount of user+system time used. The first few
160 lines should show you which subroutines are using the most time.
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162 -g "subroutine"
163 Ignore subroutines except "subroutine" and whatever is called from
164 it.
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166 -G <regexp>
167 Aggregate "Group" all calls matching the pattern together. For
168 example this can be used to group all calls of a set of packages
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170 -G "(package1::)|(package2::)|(package3::)"
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172 or to group subroutines by name:
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174 -G "getNum"
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176 -P Used with -G to aggregate "Pull" together all calls that did not
177 match -G.
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179 -f <regexp>
180 Filter all calls matching the pattern.
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182 -h Display brief help and exit.
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184 -H Display long help and exit.
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187 The environment variable DPROFPP_OPTS can be set to a string containing
188 options for dprofpp. You might use this if you prefer -I over -E or if
189 you want -F on all the time.
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191 This was added fairly lazily, so there are some undesirable side
192 effects. Options on the commandline should override options in
193 DPROFPP_OPTS--but don't count on that in this version.
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196 Applications which call _exit() or exec() from within a subroutine will
197 leave an incomplete profile. See the -F option.
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199 Any bugs in Devel::DProf, or any profiler generating the profile data,
200 could be visible here. See "BUGS" in Devel::DProf.
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202 Mail bug reports and feature requests to the perl5-porters mailing list
203 at <perl5-porters@perl.org>. Bug reports should include the output of
204 the -V option.
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207 dprofpp - profile processor
208 tmon.out - raw profile
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211 perl, Devel::DProf, times(2)
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215perl v5.34.0 2022-01-21 DPROFPP(1)