Hi Jonathan Thanks for your reply. What is 'comm' in 'prev_comm'?
Best regards David > -----Original Message----- > From: lttng-dev [mailto:lttng-dev-boun...@lists.lttng.org] On Behalf Of > Jonathan Rajotte Julien > Sent: 16 September 2016 18:37 > To: lttng-dev@lists.lttng.org > Subject: Re: [lttng-dev] Beginner question: how to inspect scheduling of > multi-threaded user application? > > Hi > > > On 2016-09-16 07:43 AM, David Aldrich wrote: > > Hi > > > > I wonder if I might ask for some more guidance please? > > > > I now have lttng and Trace Compass running on Ubuntu. I want to inspect > the scheduling of threads in my user-space application. So far, I have > successfully captured a trace with the sched_switch event enabled: > > > > $ sudo lttng enable-event -k sched_switch > > > > This indeed shows my app's threads. However, it also shows all the other > threads in the system and does not show clearly (to my understanding) > when the threads are scheduled / blocked. > > > > I would like some guidance on how to improve this tracing. > > > > 1) Would it be better if I defined my own “tracepoint providers” and then > set trace events for when a thread wakes / blocks? > > Could be a solution but you might want the built-in utility of lttng to filter > out all noise first using the filtering feature. > > e.g I'm interested in sched_switch event where chrome is involved > > lttng create > lttng enable-event --kernel "sched_switch" --filter 'prev_comm == "chrome*" > || next_comm == "chrome*"' > lttng start > .... > > Using TraceCompass you will be mainly interested in the Control Flow View > and the Resource view (show per cpu timeline activity). > > > > > 2) How could I show which core a thread is running on? > > The Resource view from TraceCompass should help here. > > Cheers > > > > > Best regards > > > > David > > _______________________________________________ > > lttng-dev mailing list > > lttng-dev@lists.lttng.org > > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > -- > Jonathan R. Julien > Efficios > > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > Click > https://www.mailcontrol.com/sr/YRkaDi7sHfjGX2PQPOmvUu5zZAYN1MosBr > 5yrM8i6yLTqipdxOLNFC1fulULj1tW45N!9c+2yXxm4uq9tqSB7g== to report > this email as spam. _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev