README.md

   1 LTTng-tools
   2 ===========
   3
   4 LTTng-tools is a set of tools to control [LTTng](https://lttng.org/)
   5 tracing. The project includes the LTTng session daemon, consumer damon
   6 and relay daemon, as well as `liblttng-ctl`, a C library used to
   7 communicate with the session daemon, and `lttng`, a command line
   8 interface to `liblttng-ctl`.
   9
  10
  11 Requirements and optional dependencies
  12 --------------------------------------
  13
  14 The following items are _required_ to build and run LTTng-tools
  15 components:
  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.
  23   - **[`liburcu`](http://www.liburcu.org/) >= 0.8.0**: userspace RCU library,
  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`
  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
  34
  35 The 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`
  40   - **[LTTng UST](https://lttng.org) (same version as LTTng Tools)**: userspace tracer.
  41     Enables the tracing of userspace applications.
  42     - Debian/Ubuntu package: `liblttng-ust-dev`
  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
  54
  55 Building
  56 --------
  57
  58 This source tree is based on the Autotools suite from GNU to simplify
  59 portability. Here are some things you should have on your system in
  60 order to compile the Git repository tree:
  61
  62   - GNU Autotools (Automake >= 1.10, Autoconf >= 2.50,
  63     Autoheader >= 2.50; make sure your system-wide `automake` points to
  64     a recent version!)
  65   - [GNU Libtool](http://www.gnu.org/software/autoconf/) >= 2.2
  66   - Flex >= 2.5.35
  67   - Bison >= 2.4
  68
  69 If you use GNU gold, which is _not_ mandatory, make sure you have this
  70 version:
  71
  72   - GNU gold >= 2.22
  73
  74 Before this version of GNU gold, we hit a
  75 [known bug](http://sourceware.org/bugzilla/show_bug.cgi?id=11317).
  76 Be advised that with GNU gold, you might have to specify
  77 `-L/usr/local/lib` in `LDFLAGS`.
  78
  79 If you get the tree from the Git repository, you will need to run
  80
  81     ./bootstrap
  82
  83 in its root. It calls all the GNU tools needed to prepare the tree
  84 configuration.
  85
  86 To build LTTng-tools, do:
  87
  88     ./configure
  89     make
  90     sudo make install
  91     sudo ldconfig
  92
  93 If you want Python bindings, add the `--enable-python-bindings` option
  94 to `configure`. Please note that some distributions will need the
  95 following environment variables set before running configure:
  96
  97     export PYTHON="python3"
  98     export PYTHON_CONFIG="/usr/bin/python3-config"
  99
 100
 101 Using
 102 -----
 103
 104 Please see [`doc/quickstart.txt`](doc/quickstart.txt) to get started
 105 with LTTng tracing. You can also use the `-h` or `--help` option of
 106 any `lttng` command, e.g.:
 107
 108     lttng enable-event --help
 109
 110 A network streaming HOWTO can be found in
 111 [`doc/streaming-howto.txt`](doc/streaming-howto.txt) which quickly
 112 helps you understand how to stream a LTTng 2.x trace.
 113
 114 A Python binding HOWTO can be found in
 115 [`doc/python-howto.txt`](doc/python-howto.txt) which quickly helps you
 116 understand how to use the Python module to control LTTng.
 117
 118
 119 Contact
 120 -------
 121
 122 Maintainer: [Jérémie Galarneau](mailto:jeremie.galarneau@efficios.com)
 123
 124 Mailing list: [`lttng-dev@lists.lttng.org`](https://lttng.org/cgi-bin/mailman/listinfo/lttng-dev)
 125
 126
 127 Package contents
 128 ----------------
 129
 130 This package contains the following elements:
 131
 132   - `doc`: LTTng-tools documentation.
 133   - `include`: the public header files that will be installed on the system.
 134   - `src/bin`: source code of LTTng-tools programs.
 135     - `lttng-consumerd`: consumer daemon.
 136     - `lttng-relayd`: relay daemon.
 137     - `lttng-sessiond`: session daemon.
 138     - `lttng`: command line interface for LTTng tracing control.
 139   - `src/common`: common LTTng-tools source code.
 140     - `compat`: compatibility library mostly for FreeBSD and Linux.
 141     - `config`: tracing session configuration saving/loading.
 142     - `hashtable`: library wrapper over Userspace RCU hashtables.
 143     - `health`: health check subsytem.
 144     - `index`: CTF index utilities.
 145     - `kernel-consumer`: Linux kernel consumer.
 146     - `kernel-ctl`: Linux kernel tracer control.
 147     - `relayd`: relay daemon control.
 148     - `sessiond-comm`: session daemon communication.
 149     - `ust-consumer`: user space consumer.
 150   - `src/lib`: source code of LTTng-tools libraries.
 151     - `lttng-ctl`: LTTng control library.
 152   - `tests`: various test programs.