<div dir="ltr"><div class="gmail_quote"><br><div dir="ltr"><div><div><div><div><div>Good Evening, <br><br></div>Hi There, <br><br></div>I have inquiries regarding LTTNG, I followed the tutorial in this link :<br><br><a href="http://lttng.org/docs/v2.10/#doc-tracing-your-own-user-application" target="_blank">http://lttng.org/docs/v2.10/#<wbr>doc-tracing-your-own-user-<wbr>application</a><br><br></div>However, after executing the c application, when I checked whether the process was in the userspace event (UST), the process was not there. Next, I tried to record the traces, as I thought, my traces output file does not contain any traces. I also have make sure that liblttng-ust has been installed. I really appreciate if you can help me to overcome this problem, if you need additional file, let me know. <br><br>I am using centos 7 by the way. <br><br></div>Here is my command line <br>[root@localhost tracepractice]# gcc -c -I. app_tp.c<br>[root@localhost tracepractice]# gcc -c app.c -lpthread<br>[root@localhost tracepractice]# gcc -o try app.o app_tp.o -lpthread -llttng-ust -ldl<br>[root@localhost tracepractice]# ./try and beyond<br>Main thread: : pid = 17231 lwp = 17231 priority = 0<br>Thread 4: : pid = 17231 lwp = 17234 priority = 0<br>Thread 2: : pid = 17231 lwp = 17236 priority = 8<br>Thread 1: : pid = 17231 lwp = 17237 priority = 12<br>Thread 1: Hello! I am thread 4 and I more important than 1, 2 and 3. My count is now 0<br>Thread 3: : pid = 17231 lwp = 17235 priority = 4<br>Thread 4: Hello! I am thread 1 and I not very important. My count is now 1<br>Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 0<br>Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 1<br>Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 262144<br>Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 262145<br>sig_ala [cound down=1]<br>sig_ala [cound down=0]<br>[root@localhost tracepractice]# lttng-sessiond --daemonize<br>[root@localhost tracepractice]# lttng list --userspace<br>UST events:<br>-------------<br>None<br><br>[root@localhost tracepractice]# lttng create mytrace<br>Session mytrace created.<br>Traces will be written in /root/lttng-traces/mytrace-<wbr>20180209-013417<br>[root@localhost tracepractice]# lttng enable-event --userspace app_tp:first_tracepoint<br>UST event app_tp:first_tracepoint created in channel channel0<br>[root@localhost tracepractice]# lttng start<br>Tracing started for session mytrace<br>[root@localhost tracepractice]# ./try<br>Main thread: : pid = 17301 lwp = 17301 priority = 0<br>Thread 4: : pid = 17301 lwp = 17304 priority = 0<br>Thread 2: : pid = 17301 lwp = 17306 priority = 8<br>Thread 1: : pid = 17301 lwp = 17307 priority = 12<br>Thread 1: Hello! I am thread 4 and I more important than 1, 2 and 3. My count is now 0<br>Thread 4: Hello! I am thread 1 and I not very important. My count is now 1<br>Thread 3: : pid = 17301 lwp = 17305 priority = 4<br>Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 0<br>Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 1<br>Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 262144<br>Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 262145<br>sig_ala [cound down=1]<br>Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 524288<br>Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 524289<br>sig_ala [cound down=0]<br>[root@localhost tracepractice]# lttng stop<br>Waiting for data availability<br>Tracing stopped for session mytrace<br>[root@localhost tracepractice]# babeltrace ~/lttng-traces/mytrace*<br>[root@localhost tracepractice]# ls ~/lttng-traces/mytrace* -l<br>total 0<br>drwxrwx---. 3 root root 17 Feb 9 01:35 ust<br><br><br></div>Thank you. <br><span class="HOEnZb"><font color="#888888"><div><br clear="all"><div><div><div><div><div><br>-- <br><div class="m_-1298659101138999654gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div><br><div>Best Regards,</div><div><br></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="text-align:left"><b style="font-size:12.8px"><i><font color="#000000" face="garamond, serif" size="4">Shieryn Tjandra</font></i></b></div></blockquote><div style="text-align:center"><br></div><div style="font-size:12.8px"><br></div><div><b><br></b></div><div><br></div><div><b style="font-size:12.8px"><br></b></div><div><br></div><div><br></div></div></div></div></div></div></div></div>
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</div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div><br><div>Best Regards,</div><div><br></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div style="text-align:left"><b style="font-size:12.8px"><i><font color="#000000" face="garamond, serif" size="4">Shieryn Tjandra</font></i></b></div><b><div style="text-align:left"><b style="font-size:12.8px"><font color="#000000" face="georgia, serif" size="2">+1 613 501 0606</font></b></div></b></blockquote><div style="text-align:center"><br></div><div style="font-size:12.8px"><br></div><div><b><br></b></div><div><br></div><div><b style="font-size:12.8px"><br></b></div><div><br></div><div><br></div></div></div></div></div></div></div></div></div></div>
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