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I am trying to use > lttng_ust_tracef() initially. > > I am running LTTng version 2.13 on Ubuntu 24.04 LTS, and viewing using > TraceCompass 10.3.0 on Windows 11. > > I use lttng_ust_tracef() in just one source file: > > #include > > { > int my_integer = 0; > string my_string = "Normal"; > lttng_ust_tracef("TaskManager: %d (%s)", my_integer, my_string.c_str()); > } > > I build with CMake and link to the lttng-ust library: > > target_link_libraries(${_lib_name} lttng-ust) > > On the target I created a session and enabled the event: > Was the lttng-sessiond already started (as the root user) when you can `lttng create my_proj`? Is your user a member of the `tracing` group? > $ lttng create my_proj > $ lttng enable-event --userspace 'lttng_ust_tracef:*' > > I have to run the application as root: > Do you have a particular reason to use `lttng-record-trace`? It looks like `lttng-record-trace` will set up a new session rather than use the one you created earlier. > sudo -E lttng-record-trace -a ./my_app Should you application run as root normally? Your commands could look like: ``` lttng create my_proj lttng enable-event --userspace 'lttng_ust_tracef:*' lttng start ./my_app lttng stop lttng view # [Optional] ``` > > When I import the trace directory into TraceCompass I tick both the > kernel and ust event boxes, and create an experiment, but then only > 'kernel' shows under the experiments and Traces in the tree view, no > ust branch is shown. > > I guess this isn't much to go on, but if anyone has any ideas why it's > not capturing ust events, I would be grateful. > You can also run the application with the environment variable `LTTNG_UST_DEBUG=1`, which will produce some output on stderr that you can use to diagnose issues. The verbose log from lttng-sessiond may also help. (Run it with `-vvv --verbose-consumer`) > Finally, which 'event_type' should I search for in the event viewer > for lttng_ust_tracef events? > The event type is `lttng_ust_tracef:event`. > Best regards > David thanks, kienan