Hi, I posted a while ago (thread - Using lttng 2.11 and UST doesn't appear to work - getting empty trace files) about this problem I'm having with getting empty trace logs.
I've since upgraded to lttng v2.13 and while I can do a simple hello world program with tracef and get events in the log files, my more complicated large multi-threaded app I'm trying to debug is still getting empty log file traces. I can list the user space events in my app. Next I do: lttng enable-event --userspace 'lttng_ust_tracef:*' ... to enable the events, start lttng, start my app, .... and I get a trace directory structure that's empty. I feel like I've read every thread in the archives about people having the same problem. I did try using LD_PRELOAD with various libs thinking that was the problem but so far I'm still getting empty traces. So far I've tried: LD_PRELOAD=liblttng-ust-libc-wrapper.so.1:liblttng-ust-pthread-wrapper.so.1:liblttng-ust-dl.so.1:liblttng-ust-fork.so.1:liblttng-ust-fd.so.1 /usr/local/bin/my_app I guess one question I have is how do I determine which "helper libs" I need to preload? The application I'm working on is made up of a bunch of smaller static libs linked together into one big executable and that is linked with -llttng-ust and -ldl. I'm pretty stuck at the moment. Anyone have any wisdom on what I might be doing wrong or how I can tell why I'm not getting events in the logs? Thanks, Brian _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
