.TH "LTTNG-SESSIOND" "8" "January 31, 2012" "" "" .SH "NAME" lttng-sessiond \(em LTTng 2.0 central tracing registry session daemon. .SH "SYNOPSIS" .PP .nf lttng-sessiond [OPTIONS] .fi .SH "DESCRIPTION" .PP The LTTng project aims at providing highly efficient tracing tools for Linux. It's tracers help tracking down performance issues and debugging problems involving multiple concurrent processes and threads. Tracing across multiple systems is also possible. The session daemon, acting as a tracing registry, allow you to interact with multiple tracers (kernel and user-space) inside the same container, a tracing session. Trace can be gathered from the kernel and/or instrumented applications (lttng-ust(3)). Aggregating those traces is done using the babeltrace(1) text viewer. In order to trace the kernel, the session daemon needs to be running as root. LTTng provides the use of a \fBtracing group\fP (default: tracing). Whomever is in that group can interact with the root session daemon and thus trace the kernel. Session daemons can co-exist meaning that you can have a session daemon running as Alice that can be use to trace her applications along side with a root daemon or even a Bob daemon. We highly recommand to start the session daemon at boot time for stable and long term tracing. The session daemon is in charge of managing trace data consumers by spawning one when the time as come. The user don't need to manage the lttng-consumerd. .SH "OPTIONS" .PP This program follow the usual GNU command line syntax with long options starting with two dashes. Below is a summary of the available options. .PP .TP .BR "-h, --help" Show summary of possible options and commands .TP .BR "-v, --verbose" Increase verbosity There is three debugging level which will print on stderr. Maximum verbosity is \fB-vvv\fP. .TP .BR " --verbose-consumer" Verbose mode for consumer. Activate DBG() macro. .TP .BR "-d, --daemonize" Start as a daemon .TP .BR "-g, --group=NAME" Specify the tracing group name. (default: tracing) .TP .BR "-V, --version" Show version number .TP .BR "-S, --sig-parent" Send SIGCHLD to parent pid to notify readiness. This is used by \fBlttng(1)\fP to get notified when the session daemon is ready to accept command. By building a third part tool over liblttng-ctl, this option can be very handy to synchronize the control tool and the session daemon. .TP .BR "-q, --quiet" No output at all. .TP .BR " --no-kernel" No kernel tracer support .TP .BR "-c, --client-sock=PATH" Specify path for the client unix socket .TP .BR "-a, --apps-sock PATH" Specify path for apps unix socket .TP .BR " --kconsumerd-err-sock=PATH" Specify path for the kernel consumer error socket .TP .BR " --kconsumerd-cmd-sock=PATH Specify path for the kernel consumer command socket .TP .BR " --ustconsumerd32-err-sock=PATH Specify path for the 32-bit UST consumer error socket .TP .BR " --ustconsumerd64-err-sock=PATH Specify path for the 64-bit UST consumer error socket .TP .BR " --ustconsumerd32-cmd-sock=PATH Specify path for the 32-bit UST consumer command socket .TP .BR " --ustconsumerd64-cmd-sock=PATH Specify path for the 64-bit UST consumer command socket .TP .BR " --consumerd32-path=PATH Specify path for the 32-bit UST consumer daemon binary .TP .BR " --consumerd32-libdir=PATH Specify path for the 32-bit UST consumer daemon libraries .TP .BR " --consumerd64-path=PATH Specify path for the 64-bit UST consumer daemon binary .TP .BR " --consumerd64-libdir=PATH Specify path for the 64-bit UST consumer daemon libraries .SH "ENVIRONMENT VARIABLES" .PP Note that all command line options will override environmenal variables. .PP .PP .IP "LTTNG_CONSUMERD32_BIN" Allow to specify the 32-bit consumer binary path. \fB--consumerd32-path\fP override this variable. .IP "LTTNG_CONSUMERD64_BIN" Allow to specify the 64-bit consumer binary path. \fB--consumerd64-path\fP override this variable. .IP "LTTNG_CONSUMERD32_LIBDIR" Allow to specifiy the 64-bit library path containing libconsumer.so. \fB--consumerd32-libdir\fP override this variable. .IP "LTTNG_CONSUMERD64_LIBDIR" Allow to specifiy the 32-bit library path containing libconsumer.so. \fB--consumerd64-libdir\fP override this variable. .IP "LTTNG_DEBUG_NOCLONE" Debug-mode disabling use of clone/fork. Insecure, but required to allow debuggers to work with sessiond on some operating systems. .SH "SEE ALSO" .PP babeltrace(1), lttng-ust(3), lttng(1) .PP .SH "BUGS" .PP No show stopper bugs known yet at this stable version. If you encounter any issues or usability problem, please report it on our mailing list to help improve this project. .SH "CREDITS" .PP lttng-sessiond is distributed under the GNU General Public License version 2. See the file COPYING for details. .PP A Web site is available at http://lttng.org for more information on the LTTng project. .PP You can also find our git tree at http://git.lttng.org. .PP Mailing lists for support and development: . .PP You can find us on IRC server irc.oftc.net (OFTC) in #lttng. .PP .SH "THANKS" .PP Thanks to Yannick Brosseau without whom this project would never have been so lean and mean! Also thanks to the Ericsson teams working on tracing which help us greatly with detailled bug reports and unsual use cases. Thanks to our beloved packager Alexandre Montplaisir-Goncalves (Ubuntu and PPA maintainer) and Jon Bernard for our Debian packages. Special thanks to Michel Dagenais and the DORSAL laboratory at Polytechnique de Montreal for the LTTng journey. .PP .SH "AUTHORS" .PP lttng-tools was originally written by Mathieu Desnoyers, Julien Desfossez and David Goulet. More people have since contributed to it. It is currently maintained by David Goulet . .PP