1LTTNG-VIEW(1) LTTng Manual LTTNG-VIEW(1)
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6 lttng-view - Launch an LTTng trace reader
7
9 lttng [GENERAL OPTIONS] view [--viewer=READER]
10 [SESSION | --trace-path=DIR]
11
13 The lttng view command launches an external trace reader to read the
14 current traces of:
15 With the --session=SESSION option
17 The recording session named SESSION.
18 With the --trace-path=DIR option
20 The local file system directory DIR.
21 Otherwise
23 The current recording session (see concepts(1) to learn more about
24 the current recording session).
25 With the --session option or without the --trace-path option, the mode
27 of the selected recording session may NOT be network streaming or live.
28 By default, the view command attempts to launch babeltrace2(1) or, if
30 it’s not available, babeltrace(1). Override which trace reader to
31 launch with the --viewer option.
32 See the “EXAMPLES” section below for usage examples.
34
36 See lttng(1) for GENERAL OPTIONS.
37 -t DIR, --trace-path=DIR
39 Pass DIR as the last argument of the trace reader command instead
40 of the output directory of the selected recording session.
41 -e READER, --viewer=READER
43 Use the trace reader READER to read the traces.
44 READER is the absolute path to the reader command to use, and it
46 can contain command arguments as well. The view command passes the
47 trace directory path to read to the READER command as its last
48 argument.
49 Without this option, the view command uses babeltrace2(1) if it’s
51 available. Otherwise, it tries to use babeltrace(1).
52 Program information
54 -h, --help
55 Show help.
56 This option attempts to launch /usr/bin/man to view this manual
58 page. Override the manual pager path with the LTTNG_MAN_BIN_PATH
59 environment variable.
60 --list-options
62 List available command options and quit.
63
65 0
66 Success
67 1
69 Command error
70 2
72 Undefined command
73 3
75 Fatal error
76 4
78 Command warning (something went wrong during the command)
79
81 LTTNG_ABORT_ON_ERROR
82 Set to 1 to abort the process after the first error is encountered.
83 LTTNG_HOME
85 Path to the LTTng home directory.
86 Defaults to $HOME.
88 Useful when the Unix user running the commands has a non-writable
90 home directory.
91 LTTNG_MAN_BIN_PATH
93 Absolute path to the manual pager to use to read the LTTng
94 command-line help (with lttng-help(1) or with the --help option)
95 instead of /usr/bin/man.
96 LTTNG_SESSION_CONFIG_XSD_PATH
98 Path to the directory containing the session.xsd recording session
99 configuration XML schema.
100 LTTNG_SESSIOND_PATH
102 Absolute path to the LTTng session daemon binary (see lttng-
103 sessiond(8)) to spawn from the lttng-create(1) command.
104 The --sessiond-path general option overrides this environment
106 variable.
107
109 $LTTNG_HOME/.lttngrc
110 Unix user’s LTTng runtime configuration.
111 This is where LTTng stores the name of the Unix user’s current
113 recording session between executions of lttng(1). lttng-create(1)
114 and lttng-set-session(1) set the current recording session.
115 $LTTNG_HOME/lttng-traces
117 Default output directory of LTTng traces in local and snapshot
118 modes.
119 Override this path with the --output option of the lttng-create(1)
121 command.
122 $LTTNG_HOME/.lttng
124 Unix user’s LTTng runtime and configuration directory.
125 $LTTNG_HOME/.lttng/sessions
127 Default directory containing the Unix user’s saved recording
128 session configurations (see lttng-save(1) and lttng-load(1)).
129 /usr/local/etc/lttng/sessions
131 Directory containing the system-wide saved recording session
132 configurations (see lttng-save(1) and lttng-load(1)).
133 Note
135 $LTTNG_HOME defaults to the value of the HOME environment variable.
136
138 Example 1. Read the traces of the current recording session with
139 Babeltrace.
140 $ lttng view
142 Example 2. Read the traces of a specific recording session with a
144 custom trace reader.
145 See the --viewer option.
147 $ lttng view --viewer='/usr/bin/my-reader -zK --details=3' \
149 my-session
150
152 • LTTng project website <https://lttng.org>
153 • LTTng documentation <https://lttng.org/docs>
155 • LTTng bug tracker <https://bugs.lttng.org>
157 • Git repositories <https://git.lttng.org>
159 • GitHub organization <https://github.com/lttng>
161 • Continuous integration <https://ci.lttng.org/>
163 • Mailing list <https://lists.lttng.org/> for support and
165 development: lttng-dev@lists.lttng.org
166 • IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net
168
170 This program is part of the LTTng-tools project.
171 LTTng-tools is distributed under the GNU General Public License
173 version 2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>.
174 See the LICENSE <https://github.com/lttng/lttng-
175 tools/blob/master/LICENSE> file for details.
176
178 Special thanks to Michel Dagenais and the DORSAL laboratory
179 <http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal for
180 the LTTng journey.
181 Also thanks to the Ericsson teams working on tracing which helped us
183 greatly with detailed bug reports and unusual test cases.
184
186 babeltrace2(1), lttng(1)
187LTTng 2.13.7 14 June 2021 LTTNG-VIEW(1)