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LTTng tools, daemon and utilities
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Latest commit 90e7d72 @jgalar jgalar Cleanup: Reduce scope of connections in main relayd thread
Signed-off-by: Jérémie Galarneau <>


LTTng-tools is a set of tools to control LTTng tracing. The project includes the LTTng session daemon, consumer damon and relay daemon, as well as liblttng-ctl, a C library used to communicate with the session daemon, and lttng, a command line interface to liblttng-ctl.

Requirements and optional dependencies

The following items are required to build and run LTTng-tools components:

  • Linux kernel >= 2.6.27: for epoll() support, at least this version is needed. However, poll() is also supported by configuring LTTng-tools with the --disable-epoll option. Using that, the kernel version may probably be older, but we can't provide any guarantee. Please let us know if you are able to go lower without any problems.
  • liburcu >= 0.8.0: userspace RCU library, by Mathieu Desnoyers and Paul E. McKenney.
  • libpopt >= 1.13: command line arguments parsing library.
    • Debian/Ubuntu package: libpopt-dev
  • libuuid: universally unique ID library
    • Debian/Ubuntu package: uuid-dev
  • libxml2 >= 2.7.6: XML document parsing library. Needed for tracing session configuration saving/loading and machine interface output support.
    • Debian/Ubuntu package: libxml2-dev

The following items are optional dependencies:

  • Babeltrace: trace viewer. Enables the use of lttng view command.
    • Debian/Ubuntu package: babeltrace
  • LTTng UST (same version as LTTng Tools): userspace tracer. Enables the tracing of userspace applications.
    • Debian/Ubuntu package: liblttng-ust-dev
  • Perl: needed for make check and tests.
  • Python >= 3.0: needed for make check and tests.
    • Debian/Ubuntu package: python3
  • SWIG >= 2.0 and Python 3 development headers: needed for Python bindings (enabled at configure time with the --enable-python-bindings option).
    • Debian/Ubuntu packages: swig2.0 and python3-dev
  • modprobe: needed for automatic LTTng kernel modules loading (kernel tracing).
  • bash: needed for running make check.


This source tree is based on the Autotools suite from GNU to simplify portability. Here are some things you should have on your system in order to compile the Git repository tree:

  • GNU Autotools (Automake >= 1.10, Autoconf >= 2.50, Autoheader >= 2.50; make sure your system-wide automake points to a recent version!)
  • GNU Libtool >= 2.2
  • Flex >= 2.5.35
  • Bison >= 2.4

If you use GNU gold, which is not mandatory, make sure you have this version:

  • GNU gold >= 2.22

Before this version of GNU gold, we hit a known bug. Be advised that with GNU gold, you might have to specify -L/usr/local/lib in LDFLAGS.

If you get the tree from the Git repository, you will need to run


in its root. It calls all the GNU tools needed to prepare the tree configuration.

To build LTTng-tools, do:

sudo make install
sudo ldconfig

If you want Python bindings, add the --enable-python-bindings option to configure. Please note that some distributions will need the following environment variables set before running configure:

export PYTHON="python3"
export PYTHON_CONFIG="/usr/bin/python3-config"


Please see doc/quickstart.txt to get started with LTTng tracing. You can also use the -h or --help option of any lttng command, e.g.:

lttng enable-event --help

A network streaming HOWTO can be found in doc/streaming-howto.txt which quickly helps you understand how to stream a LTTng 2.x trace.

A Python binding HOWTO can be found in doc/python-howto.txt which quickly helps you understand how to use the Python module to control LTTng.


Maintainer: Jérémie Galarneau

Mailing list:

Package contents

This package contains the following elements:

  • doc: LTTng-tools documentation.
  • include: the public header files that will be installed on the system.
  • src/bin: source code of LTTng-tools programs.
    • lttng-consumerd: consumer daemon.
    • lttng-relayd: relay daemon.
    • lttng-sessiond: session daemon.
    • lttng: command line interface for LTTng tracing control.
  • src/common: common LTTng-tools source code.
    • compat: compatibility library mostly for FreeBSD and Linux.
    • config: tracing session configuration saving/loading.
    • hashtable: library wrapper over Userspace RCU hashtables.
    • health: health check subsytem.
    • index: CTF index utilities.
    • kernel-consumer: Linux kernel consumer.
    • kernel-ctl: Linux kernel tracer control.
    • relayd: relay daemon control.
    • sessiond-comm: session daemon communication.
    • ust-consumer: user space consumer.
  • src/lib: source code of LTTng-tools libraries.
    • lttng-ctl: LTTng control library.
  • tests: various test programs.
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