xenial (1) lttngtoptrace.1.gz

NAME

       lttngtoptrace — Live textual LTTng Trace Viewer

SYNOPSIS

       lttngtoptrace [OPTIONS] [EXECUTABLE]

DESCRIPTION

       Lttngtoptrace  is  a  live  textual  LTTng  trace viewer, it allows to easily (one command) start a LTTng
       session and view the live events. The intent is to do something similar to strace but less intrusive  and
       more flexible:
       - run a command and see it's kernel trace almost instantly without slowing it
         down too much (buffered at most 1 second) in combination with the trace of
         any other process or the whole system
       - follow multiple processes and/or the whole system
       - follow the children of all attached processes
       - attach to processes by name and/or pid
       - actual time taken by the system calls (with reminder of start timestamp)
       - sched_switch events to know the context switches that occurred for the
         process we are interested in
       - current CPU (to see the migrations)
       - highlight the trace of a selection of processes while tracing the whole
         system to easily see the interactions
       - arbitrary kprobe additions to see if a process hits a certain place in the
         kernel

       Only  a  subset  of the LTTng events are enabled (the statedump, sched_switch, sched_process_fork and all
       the system calls).

       The events are displayed with additionnal context information than just the raw LTTng trace (such as  the
       current  process  name/PID/TID,  the  start/end time of the current system call, the delay since the last
       displayed event (filtering aware)).

OPTIONS

       -f     Follow threads associated with selected PIDs

       -p     Comma-separated list of PIDs to display (in addition to the eventual executed program)

       -n     Comma-separated list of procnames to display (in addition to the eventual executed program)

       -a     In textdump mode, display all events but write in bold the processes we are interested in (-f  and
              -p)

       -k     kprobes to insert (same format as lttng enable-event, can be repeated)

       -o <filename>
              In textdump, output the log in <filename>

       EXECUTABLE
              Program  to  run  and  connect  the tracer (can be combined with other options to see the trace of
              other processes)

REQUIREMENTS

       A working installation of LTTng >= 2.4, the appropriate rights for the user to create a kernel trace  and
       start daemons (sudo is tried in case the user is not root), Babeltrace = 1.2.4, LTTngTop = 0.3

SEE ALSO

       lttngtop(1), babeltrace(1), babeltrace-log(1), lttng(1), lttng-ust(3), lttng-sessiond(8)

BUGS

       Some highlighting problems with -a

CREDITS

       lttngtoptrace  is a wrapper on top of LTTngTop released under the GPLv2 license.  See the LICENSE file in
       the source tree for details.

       A Web site is available at http://www.efficios.com/babeltrace for more information on Babeltrace and  the
       Common Trace Format. See http://lttng.org for more information on the LTTng project.

       Mailing list for support and development: <lttng-dev@lists.lttng.org>.

       You can find us on IRC server irc.oftc.net (OFTC) in #lttng.

AUTHORS

       LTTngTop was originally written and is maintained by Julien Desfossez <jdesfossez@efficios.com>

                                                  June 01, 2015                                 LTTNGTOPTRACE(1)