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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 | |
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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. | |
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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. |