DOKK / manpages / debian 11 / lttng-tools / lttng-view.1.en

LTTng Manual

NAME

lttng-view - View the traces of an LTTng tracing session

SYNOPSIS

lttng [GENERAL OPTIONS] view [--viewer=CMD] [--trace-path=PATH | SESSION]

DESCRIPTION

The lttng view command launches an external trace viewer to view the current trace of a tracing session.

If SESSION is omitted, the viewer is launched for the current tracing session (see lttng-create(1) for more information about the current tracing session). Otherwise, it is launched for the existing tracing session named SESSION. lttng list outputs all the existing tracing sessions (see lttng-list(1)).

By default, the babeltrace2(1) trace viewer is launched. If it is not found on the system, the babeltrace(1) trace viewer is used. Another trace viewer command can be specified using the --viewer option.

By default, the trace path of the chosen tracing session is given as the first positional argument to the trace viewer. This path can be overridden using the --trace-path option.

OPTIONS

General options are described in lttng(1).

-t PATH, --trace-path=PATH

View trace at path PATH instead of using the chosen tracing session’s trace path.

-e CMD, --viewer=CMD

Use CMD as the trace viewer.

Program information

-h, --help

Show command help.

This option, like lttng-help(1), attempts to launch /usr/bin/man to view the command’s man page. The path to the man pager can be overridden by the LTTNG_MAN_BIN_PATH environment variable.

--list-options

List available command options.

ENVIRONMENT VARIABLES

LTTNG_ABORT_ON_ERROR

Set to 1 to abort the process after the first error is encountered.

LTTNG_HOME

Overrides the $HOME environment variable. Useful when the user running the commands has a non-writable home directory.

LTTNG_MAN_BIN_PATH

Absolute path to the man pager to use for viewing help information about LTTng commands (using lttng-help(1) or lttng COMMAND --help).

LTTNG_SESSION_CONFIG_XSD_PATH

Path in which the session.xsd session configuration XML schema may be found.

LTTNG_SESSIOND_PATH

Full session daemon binary path.

The --sessiond-path option has precedence over this environment variable.

Note that the lttng-create(1) command can spawn an LTTng session daemon automatically if none is running. See lttng-sessiond(8) for the environment variables influencing the execution of the session daemon.

FILES

$LTTNG_HOME/.lttngrc

User LTTng runtime configuration.

This is where the per-user current tracing session is stored between executions of lttng(1). The current tracing session can be set with lttng-set-session(1). See lttng-create(1) for more information about tracing sessions.

$LTTNG_HOME/lttng-traces

Default output directory of LTTng traces. This can be overridden with the --output option of the lttng-create(1) command.

$LTTNG_HOME/.lttng

User LTTng runtime and configuration directory.

$LTTNG_HOME/.lttng/sessions

Default location of saved user tracing sessions (see lttng-save(1) and lttng-load(1)).

/etc/lttng/sessions

System-wide location of saved tracing sessions (see lttng-save(1) and lttng-load(1)).

Note

$LTTNG_HOME defaults to $HOME when not explicitly set.

EXIT STATUS

Success

Command error

Undefined command

Fatal error

Command warning (something went wrong during the command)

BUGS

If you encounter any issue or usability problem, please report it on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-tools>.

RESOURCES

•LTTng project website <https://lttng.org>

•LTTng documentation <https://lttng.org/docs>

•Git repositories <http://git.lttng.org>

•GitHub organization <http://github.com/lttng>

•Continuous integration <http://ci.lttng.org/>

•Mailing list <http://lists.lttng.org> for support and development: lttng-dev@lists.lttng.org

•IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net

COPYRIGHTS

This program is part of the LTTng-tools project.

LTTng-tools is distributed under the GNU General Public License version 2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>. See the LICENSE <https://github.com/lttng/lttng-tools/blob/master/LICENSE> file for details.

THANKS

Special thanks to Michel Dagenais and the DORSAL laboratory <http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal for the LTTng journey.

Also thanks to the Ericsson teams working on tracing which helped us greatly with detailed bug reports and unusual test cases.