LTTngTop Julien Desfossez August 2011 Lttngtop is an ncurses interface for reading and browsing traces recorded by the LTTng tracer and displaying various statistics. As of now, the cpu usage and perf counters are displayed. This version currently only supports offline traces, but a live version is in alpha and will be available for testing soon. USAGE ----- Record a trace with LTTng 2.0 with at least the sched_switch event, and the pid, procname, tid, ppid contexts. To have the perftop view working you can enable any number of perf contexts (depending on your hardware). For the iotop view, you need to have some syscall events : sys_read, sys_write and exit_syscall. Once your trace is recorded, you can use lttngtop this way : $ lttngtop /path/to/your/trace Make sure you have read permissions on the whole directory. EXAMPLE ------- # Get root (or ideally just launch lttng-sessiond as root) lttng create lttngtop lttng enable-event -k sched_switch 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 lttng start #...do stuff... lttng stop lttng destroy # Run lttngtop lttngtop $HOME/lttng-traces/lttngtop-... BUILDING -------- ./bootstrap (skip if using tarball) ./configure make make install DEPENDENCIES ------------ To compile Babeltrace and lttngtop, you will need: gcc 3.2 or better libc6 development librairies (Debian : libc6, libc6-dev) (Fedora : glibc, glibc) glib 2.22 or better development libraries (Debian : libglib2.0-0, libglib2.0-dev) (Fedora : glib2, glib2-devel) libpopt >= 1.13 development libraries (Debian : libpopt-dev) (Fedora : popt) ncurses development libraries (Debian : libncurses5-dev) babeltrace development library For developers using the git tree: 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 (for more information, go to http://www.gnu.org/software/autoconf/) - Flex >=2.5.35. - Bison >=2.4. If you get the tree from the repository, you will need to use the "bootstrap" script in the root of the tree. It calls all the GNU tools needed to prepare the tree configuration.