[lttng-docs.git] / contents / using-lttng / controlling-tracing / basic-tracing-session-control.md

---
id: basic-tracing-session-control
---

Once you have
[created a tracing session](#doc-creating-destroying-tracing-sessions)
and [enabled one or more events](#doc-enabling-disabling-events),
you may activate the LTTng tracers for the current tracing session at
any time:

<pre class="term">
lttng start
</pre>

Subsequently, you may stop the tracers:

<pre class="term">
lttng stop
</pre>

LTTng is very flexible: user space applications may be launched before
or after the tracers are started. Events are only recorded if they
are properly enabled and if they occur while tracers are active.

A tracing session name may be passed to both the `start` and `stop`
commands to start/stop tracing a session other than the current one.
Commit	Line	Data
	1	---
	2	id: basic-tracing-session-control
	3	---
	4
	5	Once you have
	6	[created a tracing session](#doc-creating-destroying-tracing-sessions)
	7	and [enabled one or more events](#doc-enabling-disabling-events),
	8	you may activate the LTTng tracers for the current tracing session at
	9	any time:
	10
	11	<pre class="term">
	12	lttng start
	13	</pre>
	14
	15	Subsequently, you may stop the tracers:
	16
	17	<pre class="term">
	18	lttng stop
	19	</pre>
	20
	21	LTTng is very flexible: user space applications may be launched before
	22	or after the tracers are started. Events are only recorded if they
	23	are properly enabled and if they occur while tracers are active.
	24
	25	A tracing session name may be passed to both the `start` and `stop`
	26	commands to start/stop tracing a session other than the current one.