| | 1 | lttng-rotate(1) |
| | 2 | =============== |
| | 3 | :revdate: 17 May 2021 |
| | 4 | |
| | 5 | |
| | 6 | NAME |
| | 7 | ---- |
| | 8 | lttng-rotate - Archive the current trace chunk of an LTTng tracing session |
| | 9 | |
| | 10 | |
| | 11 | SYNOPSIS |
| | 12 | -------- |
| | 13 | [verse] |
| | 14 | *lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *rotate* [option:--no-wait] ['SESSION'] |
| | 15 | |
| | 16 | |
| | 17 | DESCRIPTION |
| | 18 | ----------- |
| | 19 | The `lttng rotate` command archives to the file system |
| | 20 | the current trace chunk of: |
| | 21 | |
| | 22 | With the 'SESSION' argument:: |
| | 23 | The tracing session named 'SESSION'. |
| | 24 | |
| | 25 | Without the 'SESSION' argument:: |
| | 26 | The current tracing session (see man:lttng-concepts(7) to learn more |
| | 27 | about the current tracing session). |
| | 28 | |
| | 29 | This action is called a _tracing session rotation_. |
| | 30 | |
| | 31 | See man:lttng-concepts(7) to learn more about the tracing session |
| | 32 | rotation and trace chunk concepts. |
| | 33 | |
| | 34 | You can use the `rotate` command: |
| | 35 | |
| | 36 | * Any time the tracing session is active. |
| | 37 | |
| | 38 | * A single time once the tracing session becomes inactive. |
| | 39 | |
| | 40 | See man:lttng-concepts(7) to learn more about the activity of a |
| | 41 | tracing session. |
| | 42 | |
| | 43 | By default, the `rotate` command ensures that LTTng finished performing |
| | 44 | the tracing session rotation before it prints the path of the archived |
| | 45 | trace chunk and exits. The printed path is absolute when the tracing |
| | 46 | session was created in normal mode and relative to the base output |
| | 47 | directory of the relay daemon (see the nloption:--output option of |
| | 48 | man:lttng-relayd(8)) when it was created in network streaming mode (see |
| | 49 | man:lttng-create(1)). |
| | 50 | |
| | 51 | Make the command exit immediately with the option:--no-wait option. In |
| | 52 | this case, there's no easy way to know when the current trace chunk |
| | 53 | becomes archived, and the command does :not: print the path of the |
| | 54 | archived trace chunk. |
| | 55 | |
| | 56 | Because LTTng flushes the current sub-buffers of the selected tracing |
| | 57 | session when it performs a tracing session rotation, archived trace |
| | 58 | chunks are never redundant, that is, they do not overlap over time like |
| | 59 | snapshots can (see man:lttng-snapshot(1)). Also, a rotation does :not: |
| | 60 | directly cause discarded event records or packets. |
| | 61 | |
| | 62 | A `rotate-session` trigger action can also rotate a tracing session (see |
| | 63 | man:lttng-add-trigger(1)). |
| | 64 | |
| | 65 | See the ``<<examples,EXAMPLES>>'' section below for usage examples. |
| | 66 | |
| | 67 | [IMPORTANT] |
| | 68 | ==== |
| | 69 | You may only use the `rotate` command when: |
| | 70 | |
| | 71 | * The selected tracing session was created in normal mode or in network |
| | 72 | streaming mode (see man:lttng-create(1)). |
| | 73 | |
| | 74 | * No channel was created with a configured trace file count or size |
| | 75 | limit (see the nloption:--tracefile-size and |
| | 76 | nloption:--tracefile-count options of the man:lttng-enable-channel(1) |
| | 77 | command). |
| | 78 | |
| | 79 | * LTTng is not currently performing an immediate rotation (this |
| | 80 | command). |
| | 81 | ==== |
| | 82 | |
| | 83 | |
| | 84 | include::common-lttng-cmd-options-head.txt[] |
| | 85 | |
| | 86 | |
| | 87 | option:-n, option:--no-wait:: |
| | 88 | Do not ensure that the tracing session rotation operation is |
| | 89 | completed before exiting. |
| | 90 | |
| | 91 | |
| | 92 | include::common-lttng-cmd-help-options.txt[] |
| | 93 | |
| | 94 | |
| | 95 | include::common-lttng-cmd-after-options.txt[] |
| | 96 | |
| | 97 | |
| | 98 | [[examples]] |
| | 99 | EXAMPLES |
| | 100 | -------- |
| | 101 | .Rotate the current tracing session. |
| | 102 | ==== |
| | 103 | [role="term"] |
| | 104 | ---- |
| | 105 | $ lttng rotate |
| | 106 | ---- |
| | 107 | ==== |
| | 108 | |
| | 109 | .Rotate a specific tracing session. |
| | 110 | ==== |
| | 111 | [role="term"] |
| | 112 | ---- |
| | 113 | $ lttng rotate my-session |
| | 114 | ---- |
| | 115 | ==== |
| | 116 | |
| | 117 | .Rotate the current tracing session without waiting for completion. |
| | 118 | ==== |
| | 119 | See the option:--no-wait option. |
| | 120 | |
| | 121 | [role="term"] |
| | 122 | ---- |
| | 123 | $ lttng rotate --no-wait |
| | 124 | ---- |
| | 125 | ==== |
| | 126 | |
| | 127 | |
| | 128 | include::common-footer.txt[] |
| | 129 | |
| | 130 | |
| | 131 | SEE ALSO |
| | 132 | -------- |
| | 133 | man:lttng(1), |
| | 134 | man:lttng-disable-rotation(1), |
| | 135 | man:lttng-enable-rotation(1), |
| | 136 | man:lttng-concepts(7) |
projects / lttng-tools.git / blame_incremental