Hi Mathieu,
On Thu, May 11, 2023 at 2:12 PM Mathieu Desnoyers <mathieu.desnoy...@efficios.com> wrote: > > On 2023-05-11 12:36, Brian Hutchinson via lttng-dev wrote: > > ... more background. I've always used ltt in the kernel so I don't > > have much experience with the user side of it and especially > > multi-threaded, multi-core so I'm probably missing some fundamental > > concepts that I need to understand. > > Which are the exact versions of LTTng-UST and LTTng-Tools you are using > now ? (2.13.N or which git commit ?) > > Thanks, > > Mathieu Built into my rootfs with Yocto: -rw-r--r-- 4 hutch hutch 977252 May 2 15:32 lttng-tools-2.13.9-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 11466008 May 2 15:33 lttng-tools-dbg-2.13.9-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 49104 May 2 15:32 lttng-tools-dev-2.13.9-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 87452 May 2 15:32 lttng-tools-doc-2.13.9-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 1602356 May 2 15:32 lttng-tools-ptest-2.13.9-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 867164 May 2 15:32 lttng-tools-src-2.13.9-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 219952 May 2 15:31 lttng-ust-2.13.5-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 9248 May 2 15:31 lttng-ust-bin-2.13.5-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 970248 May 2 15:31 lttng-ust-dbg-2.13.5-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 49132 May 2 15:31 lttng-ust-dev-2.13.5-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 39864 May 2 15:31 lttng-ust-doc-2.13.5-r0.aarch64.rpm -rw-r--r-- 4 hutch hutch 258392 May 2 15:31 lttng-ust-src-2.13.5-r0.aarch64.rpm Regards, Brian > > > > > Regards, > > > > Brian > > > > On Thu, May 11, 2023 at 11:53 AM Brian Hutchinson <b.hutch...@gmail.com> > > wrote: > >> > >> 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 > > -- > Mathieu Desnoyers > EfficiOS Inc. > https://www.efficios.com > _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
