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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi Jonathan and Francis<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks for your helpful replies. I am having a bit of trouble implementing your suggestions. Here is my session:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText">$ lttng create<o:p></o:p></p>
<p class="MsoPlainText">Spawning a session daemon<o:p></o:p></p>
<p class="MsoPlainText">PERROR [2885/2893]: bind inet: Address already in use (in lttcomm_bind_inet_sock() at inet.c:109)<o:p></o:p></p>
<p class="MsoPlainText">Warning: An other session daemon is using this JUL port. JUL support will be deactivated not interfering with the tracing.<o:p></o:p></p>
<p class="MsoPlainText">Session auto-20160826-083823 created.<o:p></o:p></p>
<p class="MsoPlainText">Traces will be written in <snip>/lttng-traces/auto-20160826-083823<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">$ sudo lttng enable-event -k sched_switch<o:p></o:p></p>
<p class="MsoPlainText">Error: Event sched_switch: Session name not found (channel channel0, session auto-20160826-083823)<o:p></o:p></p>
<p class="MsoPlainText">Warning: Some command(s) went wrong<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">There seem to be two problems here:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">How to kill a lttng daemon that is already running?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">How to specify a session?<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Sorry that these are basic questions. I would be grateful if you can help please.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">David<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Jonathan Rajotte [mailto:jonathan.r.julien@gmail.com]
<br>
<b>Sent:</b> 24 August 2016 17:39<br>
<b>To:</b> Francis Deslauriers <francis.deslauriers@mail.utoronto.ca><br>
<b>Cc:</b> David Aldrich <David.Aldrich@EMEA.NEC.COM>; lttng-dev@lists.lttng.org<br>
<b>Subject:</b> Re: [lttng-dev] Beginner question: how to inspect scheduling of multi-threaded user application?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Sorry had a sending problem. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Here is the rest.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Aug 24, 2016 at 12:35 PM, Jonathan Rajotte <<a href="mailto:jonathan.r.julien@gmail.com" target="_blank">jonathan.r.julien@gmail.com</a>> wrote:<o:p></o:p></p>
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<p>Hi,<o:p></o:p></p>
<p>On Aug 24, 2016 12:18 PM, "Francis Deslauriers" <<a href="mailto:francis.deslauriers@mail.utoronto.ca" target="_blank">francis.deslauriers@mail.utoronto.ca</a>> wrote:<br>
><br>
> Hi David, <br>
> If you specifically want to trace the scheduling of the threads of your app, you don't need custom tracepoints.<br>
> 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.<br>
><br>
> You can enable the sched_switch event using : lttng enable-event -k sched_switch<o:p></o:p></p>
<p>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.<o:p></o:p></p>
<p>I'm not sure of the base requirement for those views you can use the safe enable-event:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">replace "safe" by "easiest".<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p>lttng enable-event -k 'sched*'<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>You can also use "lttng track" to limi the gathering of event to a certain pid.<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>Another way to reduce the scope would be to filter per procname:<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>lttng create<br>
lttng add-context -k -t procname<br>
lttng enable-event 'sched*' --filter '$ctx.procname == "PROCNAMEHERE"'<o:p></o:p></p>
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<p class="MsoNormal">lttng start<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">PROCNAMEHERE can contain '*' wildcard. See the man page for more information.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p>><br>
> Cheers,<br>
> Francis<br>
><br>
><br>
> 2016-08-24 3:17 GMT-04:00 David Aldrich <<a href="mailto:David.Aldrich@emea.nec.com" target="_blank">David.Aldrich@emea.nec.com</a>>:<br>
>><br>
>> Hi<br>
>><br>
>> <br>
>><br>
>> I am new to tracing in Linux and to lttng. I have a multi-threaded user application and I want to see:<br>
>><br>
>> <br>
>><br>
>> 1) When the threads are scheduled to run<br>
>><br>
>> 2) Which cores the threads are running on.<br>
>><br>
>> <br>
>><br>
>> I have installed lttng on Ubuntu 14.04 LTS. I am expecting to visualise the trace using TraceCompass.<br>
>><br>
>> <br>
>><br>
>> I have read the following doc section:<br>
>><br>
>> <br>
>><br>
>> <a href="http://lttng.org/docs/#doc-tracing-your-own-user-application" target="_blank">
http://lttng.org/docs/#doc-tracing-your-own-user-application</a><br>
>><br>
>> <br>
>><br>
>> 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?<br>
>><br>
>> <br>
>><br>
>> Best regards<br>
>><br>
>> <br>
>><br>
>> David<br>
>><br>
>> <br>
>><br>
>><br>
>> _______________________________________________<br>
>> lttng-dev mailing list<br>
>> <a href="mailto:lttng-dev@lists.lttng.org" target="_blank">lttng-dev@lists.lttng.org</a><br>
>> <a href="https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev" target="_blank">
https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev</a><br>
>><br>
><br>
><br>
> _______________________________________________<br>
> lttng-dev mailing list<br>
> <a href="mailto:lttng-dev@lists.lttng.org" target="_blank">lttng-dev@lists.lttng.org</a><br>
> <a href="https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev" target="_blank">
https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev</a><br>
><o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Jonathan Rajotte Julien<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="background:white"><o:p> </o:p></span></p>
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