doc/lttngtop.1

   1 .TH "LTTNGTOP" "1" "April 18, 2012" "" ""
   2
   3 .SH "NAME"
   4 lttngtop \(em LTTng Trace Viewer
   5
   6 .SH "SYNOPSIS"
   7
   8 .PP
   9 .nf
  10 lttngtop INPUT
  11 .fi
  12 .SH "DESCRIPTION"
  13
  14 .PP
  15
  16 Lttngtop is a ncurses interface for reading and browsing traces recorded by the
  17 LTTng tracer and displaying various statistics. As of now, the cpu usage,
  18 performance counters and per process/file I/O bandwidth are displayed. This
  19 version currently only supports offline traces, but a live version is in alpha
  20 and will be available for testing soon.
  21 .SH "OPTIONS"
  22
  23 .TP
  24 .BR "INPUT"
  25 Input trace path
  26
  27 .SH "TRACE REQUIREMENTS"
  28
  29 .PP
  30
  31 LTTngTop requires that the pid, procname, tid and ppid context information
  32 are enabled during tracing.
  33 .PP
  34
  35 .PP
  36 If you want the CPU activity view, you need the sched_switch event, if you
  37 want the I/O statistics, you need to enable the system call tracing, and if
  38 you want the performance counters, you need to enable them for the events you
  39 are interested in (or all of them). Note, there is a hardware limitation for the
  40 number of performance counter you can enable, check dmesg for information.
  41 .PP
  42
  43 .PP
  44 The following example creates a trace with all events enabled, the mandatory context informations and
  45 three performance counters. It assumes that you are running as root or with a user part of the tracing group and a lttng-sessiond
  46 launched as root.
  47 .PP
  48
  49 .nf
  50 lttng create lttngtop
  51 lttng enable-event -k -a
  52 lttng add-context -k -t pid -t procname -t tid -t ppid -t perf:cache-misses -t perf:major-faults -t perf:branch-load-misses
  53 lttng start
  54 sleep 10
  55 lttng stop
  56 lttng destroy
  57 .fi
  58
  59 .SH "SEE ALSO"
  60
  61 .PP
  62 babeltrace(1), babeltrace-log(1), lttng(1), lttng-ust(3), lttng-sessiond(8)
  63 .PP
  64 .SH "BUGS"
  65
  66 .PP
  67 No knows bugs at this point.
  68
  69 If you encounter any issues or usability problem, please report it on
  70 our mailing list <lttng-dev@lists.lttng.org> to help improve this
  71 project.
  72 .SH "CREDITS"
  73
  74 LTTngTop is distributed under the GPLv2 license. See the LICENSE file
  75 in the source tree for details.
  76
  77 .PP
  78 A Web site is available at http://www.efficios.com/babeltrace for more
  79 information on Babeltrace and the Common Trace Format. See
  80 http://lttng.org for more information on the LTTng project.
  81 .PP
  82 Mailing list for support and development: <lttng-dev@lists.lttng.org>.
  83 .PP
  84 You can find us on IRC server irc.oftc.net (OFTC) in #lttng.
  85 .PP
  86
  87 .SH "AUTHORS"
  88
  89 .PP
  90 LTTngTop was originally written by Julien Desfossez, with contribution
  91 from Mathieu Bain for the I/O bandwidth view, and suggestions and ideas
  92 from the team working with the LTTng project. It is currently
  93 maintained by Julien Desfossez <jdesfossez@efficios.com>
  94 .PP