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On Wed, Aug 24, 2016 at 12:35 PM, Jonathan Rajotte < jonathan.r.jul...@gmail.com> wrote: > Hi, > > On Aug 24, 2016 12:18 PM, "Francis Deslauriers" < > francis.deslauri...@mail.utoronto.ca> wrote: > > > > Hi David, > > If you specifically want to trace the scheduling of the threads of your > app, you don't need custom tracepoints. > > Enabling the sched_switch kernel event will give you both of cpu id and > thread id. Look at the cpu_id and next_tid fields. > > > > You can enable the sched_switch event using : lttng enable-event -k > sched_switch > > In TraceCompass you can inspect this data with the control flow view and > the Ressource view under the Kernel analysis node under the trace node in > the project explorer. > > I'm not sure of the base requirement for those views you can use the safe > enable-event: > replace "safe" by "easiest". > lttng enable-event -k 'sched*' > > > You can also use "lttng track" to limi the gathering of event to a certain > pid. > > > Another way to reduce the scope would be to filter per procname: > > > lttng create > lttng add-context -k -t procname > lttng enable-event 'sched*' --filter '$ctx.procname == "PROCNAMEHERE"' > lttng start PROCNAMEHERE can contain '*' wildcard. See the man page for more information. Cheers > > > > Cheers, > > Francis > > > > > > 2016-08-24 3:17 GMT-04:00 David Aldrich <david.aldr...@emea.nec.com>: > >> > >> Hi > >> > >> > >> > >> I am new to tracing in Linux and to lttng. I have a multi-threaded user > application and I want to see: > >> > >> > >> > >> 1) When the threads are scheduled to run > >> > >> 2) Which cores the threads are running on. > >> > >> > >> > >> I have installed lttng on Ubuntu 14.04 LTS. I am expecting to > visualise the trace using TraceCompass. > >> > >> > >> > >> I have read the following doc section: > >> > >> > >> > >> http://lttng.org/docs/#doc-tracing-your-own-user-application > >> > >> > >> > >> In order to collect my trace, must I define custom tracepoint > definitions ( in a tracepoint provider header file ), and insert > tracepoints into my user application, or is there a simpler way of > achieving my goal? > >> > >> > >> > >> Best regards > >> > >> > >> > >> David > >> > >> > >> > >> > >> _______________________________________________ > >> lttng-dev mailing list > >> lttng-dev@lists.lttng.org > >> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > >> > > > > > > _______________________________________________ > > lttng-dev mailing list > > lttng-dev@lists.lttng.org > > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > -- Jonathan Rajotte Julien
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