Good Evening, Hi There,
I have inquiries regarding LTTNG, I followed the tutorial in this link : http://lttng.org/docs/v2.10/#doc-tracing-your-own-user-application 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. I am using centos 7 by the way. Here is my command line [root@localhost tracepractice]# gcc -c -I. app_tp.c [root@localhost tracepractice]# gcc -c app.c -lpthread [root@localhost tracepractice]# gcc -o try app.o app_tp.o -lpthread -llttng-ust -ldl [root@localhost tracepractice]# ./try and beyond Main thread: : pid = 17231 lwp = 17231 priority = 0 Thread 4: : pid = 17231 lwp = 17234 priority = 0 Thread 2: : pid = 17231 lwp = 17236 priority = 8 Thread 1: : pid = 17231 lwp = 17237 priority = 12 Thread 1: Hello! I am thread 4 and I more important than 1, 2 and 3. My count is now 0 Thread 3: : pid = 17231 lwp = 17235 priority = 4 Thread 4: Hello! I am thread 1 and I not very important. My count is now 1 Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 0 Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 1 Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 262144 Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 262145 sig_ala [cound down=1] sig_ala [cound down=0] [root@localhost tracepractice]# lttng-sessiond --daemonize [root@localhost tracepractice]# lttng list --userspace UST events: ------------- None [root@localhost tracepractice]# lttng create mytrace Session mytrace created. Traces will be written in /root/lttng-traces/mytrace-20180209-013417 [root@localhost tracepractice]# lttng enable-event --userspace app_tp:first_tracepoint UST event app_tp:first_tracepoint created in channel channel0 [root@localhost tracepractice]# lttng start Tracing started for session mytrace [root@localhost tracepractice]# ./try Main thread: : pid = 17301 lwp = 17301 priority = 0 Thread 4: : pid = 17301 lwp = 17304 priority = 0 Thread 2: : pid = 17301 lwp = 17306 priority = 8 Thread 1: : pid = 17301 lwp = 17307 priority = 12 Thread 1: Hello! I am thread 4 and I more important than 1, 2 and 3. My count is now 0 Thread 4: Hello! I am thread 1 and I not very important. My count is now 1 Thread 3: : pid = 17301 lwp = 17305 priority = 4 Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 0 Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 1 Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 262144 Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 262145 sig_ala [cound down=1] Thread 2: Hello! I am thread 3 and I more important than 1 and 2. My count is now 524288 Thread 3: Hello! I am thread 2 and I more important than 1. My count is now 524289 sig_ala [cound down=0] [root@localhost tracepractice]# lttng stop Waiting for data availability Tracing stopped for session mytrace [root@localhost tracepractice]# babeltrace ~/lttng-traces/mytrace* [root@localhost tracepractice]# ls ~/lttng-traces/mytrace* -l total 0 drwxrwx---. 3 root root 17 Feb 9 01:35 ust Thank you. -- Best Regards, *Shieryn Tjandra* -- Best Regards, *Shieryn Tjandra* *+1 613 501 0606*
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