1Devel::NYTProf::ReadStrUesaemr(3C)ontributed Perl DocumeDnetvaetli:o:nNYTProf::ReadStream(3)
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6 Devel::NYTProf::ReadStream - Read Devel::NYTProf data file as a stream
7
9 use Devel::NYTProf::ReadStream qw(for_chunks);
10 for_chunks {
12 my $tag = shift;
13 print "$tag\n";
14 # examine @_
15 ....
16 }
17 # quickly dump content of a file
19 use Data::Dump;
20 for_chunks(\&dd);
21
23 This module provide a low level interface for reading the contents of
24 nytprof.out files (Devel::NYTProf data files) as a stream of chunks.
25 Currently the module only provide a single function:
27 for_chunks( \&callback, %opts )
29 This function will read the nytprof.out file and invoke the given
30 callback function for each chunk in the file.
31 The first argument passed to the callback is the chunk tag. The
33 rest of the arguments passed depend on the tag. See "Chunks" for
34 the details. The return value of the callback function is ignored.
35 The for_chunks() function will croak if the file can't be opened or
37 if the file format isn't recognized. The global $. variable is
38 made to track the chunk sequence numbers and can be inspected in
39 the callback.
40 The behaviour of the function can be modified by passing key/value
42 pairs after the callback. The contents of %opts are passed to "new"
43 in Devel::NYTProf::Data.
44 The function is prototyped as "(&%)" which means that it can be
46 invoked with a bare block representing the callback function. In
47 that case there should be no comma before any options. Example:
48 for_chunk { say $_[0] } filename => "myprof.out";
50 Chunks
52 The nytprof.out file contains a sequence of tagged chunks that are
53 streamed out as the profiled program runs. This documents how the
54 chunks appear when presented to the callback function of the
55 for_chunks() function for version 4.0 of the file format.
56 Note that the chunks and their arguments are liable to change between
58 versions as NYTProf evolves.
59 VERSION => $major, $minor
61 The first chunk in the file declare what version of the file format
62 was used for the current file.
63 COMMENT => $text
65 This chunk is just some textual content that can be ignored.
66 ATTRIBUTE => $key, $value
68 This chunk type is repeated at the beginning of the file and used
69 to declare various facts about the profiling run. The only one
70 that's really interesting is "ticks_per_sec" that tell you how to
71 convert the $ticks values into seconds.
72 The attributes reported are:
74 basetime => $time
76 The time (epoch based) when the profiled perl process started.
77 It's the same value as $^T.
78 xs_version => $ver
80 The version of the Devel::NYTProf used for profiling.
81 perl_version => $ver
83 The version of perl used for profiling. This is a string like
84 "5.10.1".
85 clock_id => $num
87 What kind of clock was used to profile the program. Will be
88 "-1" for the default clock.
89 ticks_per_sec => $num
91 Divide the $ticks values in TIME_BLOCK/TIME_LINE by this number
92 to convert the time to seconds.
93 nv_size => 8
95 The $Config{nv_size} of the perl that wrote this file. This
96 value must match for the perl that reads the file as well.
97 application => $string
99 The path to the program that ran; same as $0 in the program
100 itself.
101 OPTION => $key, $value
103 This chunk type is repeated at the beginning of the file and used
104 to record the options, e.g. set via the NYTPROF env var, that were
105 effect during the profiling run.
106 START_DEFLATE
108 This chunk just say that from now on all chunks have been
109 compressed in the file.
110 PID_START => $pid, $parent_pid, $start_time
112 The process with the given $pid starts running (under the
113 profiler).
114 Dates from the way forking used to be supported. Likely to get
116 deprecated when we get better support for tracking the time the sub
117 profiler and statement profiler were actually active. (Which is
118 needed to calculate percentages.)
119 NEW_FID => $fid, $eval_fid, $eval_line, $flags, $size, $mtime, $name
121 Files are represented by integers called 'fid' (File IDs) and this
122 chunk declares the mapping between these numbers and file path
123 names.
124 TIME_BLOCK => $ticks, $fid, $line, $block_line, $sub_line
126 TIME_LINE => $ticks, $fid, $line
127 A TIME_BLOCK or TIME_LINE chunk is output each time the execution
128 of the program leaves a statement.
129 DISCOUNT
131 Indicates that the next TIME_BLOCK or TIME_LINE should not
132 increment the "number of times the statement was executed". See the
133 'leave' option.
134 SUB_INFO => $fid, $first_line, $last_line, $name
136 At the end of the run the profiler will output chunks that report
137 on the perl subroutines defined in all the files visited while
138 profiling. See also %DB::sub in perldebguts.
139 SUB_CALLERS => $fid, $line, $count, $incl_time, $excl_time, $reci_time,
141 $rec_depth, $name, $caller_name
142 At the end of the run the profiler will output chunks that report
143 on where subroutines were called from.
144 SRC_LINE => $fid, $line, $text
146 Used to reproduce the source code of the files and evals profiled.
147 Requires perl 5.8.9+ or 5.10.1+ or 5.12 or later. For earlier
148 versions of perl the source code of "perl -e '...'" and "perl -"
149 'files' is available if the "use_db_sub=1" option was used when
150 profiling.
151 PID_END => $pid, $end_time
153 The process with the given $pid is done running. See the
154 description of PID_START above.
155
157 Devel::NYTProf, Devel::NYTProf::Data
158
160 Gisle Aas
161
163 Copyright (C) 2008 by Adam Kaplan and The New York Times Company.
164 Copyright (C) 2008 by Tim Bunce, Ireland.
165 Copyright (C) 2008 by Gisle Aas
166 This library is free software; you can redistribute it and/or modify it
168 under the same terms as Perl itself, either Perl version 5.8.8 or, at
169 your option, any later version of Perl 5 you may have available.
170perl v5.30.1 2019-12-10 Devel::NYTProf::ReadStream(3)