contents/using-lttng/controlling-tracing/basic-tracing-session-control.md

   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.