lttng-view — View the traces of an LTTng tracing session
lttng view command launches an external trace viewer to view the
current trace of a tracing session.
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
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
Another trace viewer command can be specified using the
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
Set to 1 to abort the process after the first error is encountered.
$HOME environment variable. Useful when the user
running the commands has a non-writable home directory.
Absolute path to the man pager to use for viewing help information
about LTTng commands (using lttng-help(1) or
lttng COMMAND --help).
Path in which the
session.xsd session configuration XML
schema may be found.
Full session daemon binary path.
--sessiond-path option has precedence over this
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.
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.
Default output directory of LTTng traces. This can be overridden
--output option of the lttng-create(1)
User LTTng runtime and configuration directory.
$LTTNG_HOME defaults to
$HOME when not explicitly set.
Command warning (something went wrong during the command)
If you encounter any issue or usability problem, please report it on the LTTng bug tracker.
Special thanks to Michel Dagenais and the DORSAL laboratory 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.