lttng-stop — Stop LTTng tracers
lttng stop command stops the various LTTng tracers for a given
active tracing session.
Stopping the LTTng tracers has the effect that all enabled event rules within enabled channels cannot make event sources emit trace events anymore.
A tracing session with no running tracers is said to be inactive. Inactive tracing sessions can be set active using the lttng-start(1) command.
SESSION is omitted, the LTTng tracers are stopped for the current
tracing session (see lttng-create(1) for more information
about the current tracing session). Otherwise, they are stopped for the
existing tracing session named
outputs all the existing tracing sessions (see lttng-list(1)).
By default, the
lttng stop command ensures that the tracing session’s
trace data is valid before returning to the prompt. With the
--no-wait option, the command finishes immediately, hence a local
trace might not be valid when the command is done. In this case, there
is no way to know when the trace becomes valid.
If at least one rotation occurred during the chosen tracing session’s
lifetime (see lttng-rotate(1) and lttng-enable-rotation(1)), the
lttng stop command renames the current trace chunk subdirectory and
prints the renamed path. Although it is safe to read the content of this
renamed subdirectory while the tracing session remains inactive (until
the next lttng-start(1)), it is not a trace chunk archive: you
need to destroy the tracing session with lttng-destroy(1) or make
a rotation with lttng-rotate(1) to archive it.
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.