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Re: [tracecompass-dev] [EXTERNAL] Re: Trying to get live trace working withTrace Compass

Okay Bernd

Thanks for the Clarification


From: tracecompass-dev-bounces@xxxxxxxxxxx [mailto:tracecompass-dev-bounces@xxxxxxxxxxx] On Behalf Of Bernd Hufmann
Sent: 27 July 2018 19:33
To: tracecompass developer discussions
Subject: [EXTERNAL] Re: [tracecompass-dev] Trying to get live trace working withTrace Compass


Hi John,


Thanks for using Trace Compass.


It is not possible to view traces live using live LTTng trace sessions in Trace Compass.


There used to be an implementation for local applications only (applications that run on the same machine than Trace Compass). But it didn’t use the lttng-relayd protocol to get the trace events and it didn’t work well. For that reason, it was removed from Trace Compass.


What is possible, is to configure LTTng trace sessions for streaming as described in the user guide. But I see in your post, that you’re using a script for that.






From: tracecompass-dev-bounces@xxxxxxxxxxx <tracecompass-dev-bounces@xxxxxxxxxxx> On Behalf Of John O'Sullivan
Sent: July-27-18 12:25 PM
To: tracecompass-dev@xxxxxxxxxxx
Subject: [tracecompass-dev] Trying to get live trace working withTrace Compass


Hi I am using the standalone version (Version: 3.3.0) of Trace Compass. I am trying to get live streams working.

I have a session running on my board which connects to lttng-relayd instance on my host machine using a script like

#Create a session sending the data over the network to a listening host
lttng create --set-url="" --live
lttng enable-event --userspace sample_application:information_tracepoint
lttng enable-event --kernel sched_switch,sched_process_fork
lttng start


 I can see the trace events in the lower left hand control panel but I can never get any of the events to appear in the panes on the right-hand side.

With a hierarchy like




If I expand these I can see kernel and user events

But I can never get a live view to appear in the Right Hand Windows like one would see with a trace file that you load from disk

I tried various options like create session and import but with no success.

I have followed the instruction at

But still cannot figure out how to get a live view of the trace in the right hand windows. Any help would be appreciated.

Id this feature functional?





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