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[lttng-tools.git] / README.md
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1LTTng-tools
2===========
3
4LTTng-tools is a set of tools to control [LTTng](https://lttng.org/)
5tracing. The project includes the LTTng session daemon, consumer damon
6and relay daemon, as well as `liblttng-ctl`, a C library used to
7communicate with the session daemon, and `lttng`, a command line
8interface to `liblttng-ctl`.
9
10
11Requirements and optional dependencies
12--------------------------------------
13
14The following items are _required_ to build and run LTTng-tools
15components:
16
17 - **Linux kernel >= 2.6.27**: for `epoll()` support, at least this
18 version is needed. However, `poll()` is also supported by
19 configuring LTTng-tools with the `--disable-epoll` option. Using
20 that, the kernel version may probably be older, but we can't provide
21 any guarantee. Please let us know if you are able to go lower
22 without any problems.
99ad3285 23 - **[`liburcu`](http://www.liburcu.org/) >= 0.8.0**: userspace RCU library,
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24 by Mathieu Desnoyers and Paul E. McKenney.
25 - **`libpopt` >= 1.13**: command line arguments parsing library.
26 - Debian/Ubuntu package: `libpopt-dev`
27 - **`libuuid`**: universally unique ID library
28 - Debian/Ubuntu package: `uuid-dev`
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29 - **`libxml2` >= 2.7.6**: XML document parsing library. Needed for
30 tracing session configuration saving/loading and machine interface
31 output support.
32 - Debian/Ubuntu package: `libxml2-dev`
33
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34
35The following items are _optional_ dependencies:
36
37 - **[Babeltrace](https://lttng.org/babeltrace)**: trace viewer.
38 Enables the use of `lttng view` command.
39 - Debian/Ubuntu package: `babeltrace`
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40 - **[LTTng UST](https://lttng.org) (same minor version as LTTng Tools)**:
41 userspace tracer. Enables the tracing of userspace applications.
213ff7c7 42 - Debian/Ubuntu package: `liblttng-ust-dev`
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43 - **Perl**: needed for `make check` and tests.
44 - **Python >= 3.0**: needed for `make check` and tests.
45 - Debian/Ubuntu package: `python3`
46 - **SWIG >= 2.0** and **Python 3 development headers**: needed for
47 Python bindings
48 (enabled at configure time with the `--enable-python-bindings` option).
49 - Debian/Ubuntu packages: `swig2.0` and `python3-dev`
50 - **modprobe**: needed for automatic LTTng kernel modules loading
51 (kernel tracing).
52 - **bash**: needed for running `make check`.
53
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54LTTng-tools supports both the [LTTng Linux Kernel tracer](https://lttng.org)
55and [LTTng user space tracer](https://lttng.org) released as part of the same
56**minor** release series. While some releases do not change the tracer ABIs and
57should work with, no testing is performed to ensure cross-version compatibility
58is maintained.
59
60Note that applications instrumented with older versions of the LTTng UST project
61do not have to be rebuilt or modified to work with the latest LTTng-tools.
62For more information on versioning, please refer to the
63[LTTng documentation](https://lttng.org/docs).
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64
65Building
66--------
67
68This source tree is based on the Autotools suite from GNU to simplify
69portability. Here are some things you should have on your system in
70order to compile the Git repository tree:
71
5d5baaa3 72 - GNU Autotools (Automake >= 1.10, Autoconf >= 2.64,
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73 Autoheader >= 2.50; make sure your system-wide `automake` points to
74 a recent version!)
75 - [GNU Libtool](http://www.gnu.org/software/autoconf/) >= 2.2
76 - Flex >= 2.5.35
77 - Bison >= 2.4
78
79If you use GNU gold, which is _not_ mandatory, make sure you have this
80version:
81
82 - GNU gold >= 2.22
83
84Before this version of GNU gold, we hit a
85[known bug](http://sourceware.org/bugzilla/show_bug.cgi?id=11317).
86Be advised that with GNU gold, you might have to specify
87`-L/usr/local/lib` in `LDFLAGS`.
88
89If you get the tree from the Git repository, you will need to run
90
91 ./bootstrap
92
93in its root. It calls all the GNU tools needed to prepare the tree
94configuration.
95
96To build LTTng-tools, do:
97
98 ./configure
99 make
100 sudo make install
101 sudo ldconfig
102
103If you want Python bindings, add the `--enable-python-bindings` option
104to `configure`. Please note that some distributions will need the
105following environment variables set before running configure:
106
107 export PYTHON="python3"
108 export PYTHON_CONFIG="/usr/bin/python3-config"
109
110
111Using
112-----
113
114Please see [`doc/quickstart.txt`](doc/quickstart.txt) to get started
115with LTTng tracing. You can also use the `-h` or `--help` option of
116any `lttng` command, e.g.:
117
118 lttng enable-event --help
119
120A network streaming HOWTO can be found in
121[`doc/streaming-howto.txt`](doc/streaming-howto.txt) which quickly
122helps you understand how to stream a LTTng 2.x trace.
123
124A Python binding HOWTO can be found in
125[`doc/python-howto.txt`](doc/python-howto.txt) which quickly helps you
126understand how to use the Python module to control LTTng.
127
128
129Contact
130-------
131
04814575 132Maintainer: [Jérémie Galarneau](mailto:jeremie.galarneau@efficios.com)
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133
134Mailing list: [`lttng-dev@lists.lttng.org`](https://lttng.org/cgi-bin/mailman/listinfo/lttng-dev)
135
136
137Package contents
138----------------
139
140This package contains the following elements:
141
142 - `doc`: LTTng-tools documentation.
143 - `include`: the public header files that will be installed on the system.
144 - `src/bin`: source code of LTTng-tools programs.
145 - `lttng-consumerd`: consumer daemon.
146 - `lttng-relayd`: relay daemon.
147 - `lttng-sessiond`: session daemon.
148 - `lttng`: command line interface for LTTng tracing control.
149 - `src/common`: common LTTng-tools source code.
150 - `compat`: compatibility library mostly for FreeBSD and Linux.
151 - `config`: tracing session configuration saving/loading.
152 - `hashtable`: library wrapper over Userspace RCU hashtables.
153 - `health`: health check subsytem.
154 - `index`: CTF index utilities.
155 - `kernel-consumer`: Linux kernel consumer.
156 - `kernel-ctl`: Linux kernel tracer control.
157 - `relayd`: relay daemon control.
158 - `sessiond-comm`: session daemon communication.
159 - `ust-consumer`: user space consumer.
160 - `src/lib`: source code of LTTng-tools libraries.
161 - `lttng-ctl`: LTTng control library.
162 - `tests`: various test programs.
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