Hi,
There is indeed something weird with the lttng-modules package on 12.04.
But if you are only doing userspace tracing, then that part should not
matter, all you need is "lttng-tools" and "liblttng-ust-dev".
You also seem to have lots of older package versions installed. This can
sometimes create problems, as an application can link against one
version of the UST library, but the tracer control will use another,
which will result in no tracepoints being taken.
To be safe you might want to remove (with "apt-get purge") everything
that is listed there, and only reinstall those you need from the PPA.
This should avoid duplicate versions of liburcu and liblttng-ust*.
Also make sure you have no lingering libraries in /usr/local. This is
another very common problem!
Let us know if it still doesn't work.
Cheers,
Alexandre
On 12/12/2014 08:58 AM, Jérémie Galarneau wrote:
On Fri, Dec 12, 2014 at 5:59 AM, Yan Grange <[email protected]> wrote:
Hi,
Let me start by thanking you for all the support you give (it is impressingly
fast).
So if I look in the repo, with the ppa installed, I can't find liburcu:
$ cat /etc/apt/sources.list.d/lttng-ppa-precise.list
deb http://ppa.launchpad.net/lttng/ppa/ubuntu precise main
deb-src http://ppa.launchpad.net/lttng/ppa/ubuntu precise main
(I have asked my admin to do an apt-get update)
$ apt-cache search lttng
lttng-modules-dkms - Linux Trace Toolkit (LTTng) kernel modules (DKMS)
lttng-tools - LTTng control and utility programs
liblttng-ust0 - LTTng 2.0 Userspace Tracer (libraries)
liblttng-ust-dev - LTTng 2.0 Userspace Tracer (development files)
liblttng-ctl-dev - LTTng control and utility library (development files)
liblttng-ctl0 - LTTng control and utility library
liblttng-ust-java-jni - LTTng 2.0 Userspace Tracer (JNI interface)
liblttng-ust-java - LTTng 2.0 Userspace Tracer (Java support library)
python-lttng - Python bindings for LTTng
liblttng-ust-ctl2 - LTTng 2.0 Userspace Tracer (trace control library)
$ apt-cache search liburcu
liburcu-dev - a userspace RCU (read-copy-update) library - development files
liburcu1 - a userspace RCU (read-copy-update) library
liburcu2 - a userspace RCU (read-copy-update) library
So it looks like my aptitude is not aware of a package called liburcu without a
postfix… Even if I'd purge and reinstall (which seems like a very good idea) I
don't see if I can access the right library this way.
The packaging situation on Ubuntu 12.04 is a little confusing...
As far as I can tell, you have
liburcu (the one available in the official Ubuntu 12.04 repos, v0.6.7)
liburcu1 (v0.7.x)
liburcu2 (v0.8.x)
The LTTng version on the PPA (v2.5.x) depends on the 0.8 liburcu.
Therefore, liburcu2 is the one you want to install.
Looking at the dependencies, it seems that installing lttng-tools and
lttng-modules-dkms (from the PPA) should have you covered and install
everything you need.
CC-ing Alexandre Montplaisir who maintains most of these packages.
Regards,
Jérémie
Cheers
Yan Grange
On 11 dec. 2014, at 18:08, Jérémie Galarneau <[email protected]>
wrote:
On Thu, Dec 11, 2014 at 8:56 AM, Yan Grange <[email protected]> wrote:
Hi,
I can't really make out
However it actually works to create a header file from a tp file and compile
(and run) the code. However I now get in trouble when executing:
$ lttng list --userspace
Error: Unable to list UST events: Undefined command
Error: Command error
So I guess something still went somewhat wrong but I can't really see what.
Yan Grange
In order to trace user-space, you must install, in sequence, the following
packages: userspace-rcu, lttng-ust, lttng-tools. Was this done?
I tried to install the right packages but there don't seem to be packages named
like that in either the ubuntu repository or the ppa provided by you.
I have the following packages installed:
lttng-tools
liblttng-ust0
liblttng-ust-dev
liblttng-ust-ctl2
liblttng-ctl0
liburcu-dev
liburcu2
Some of these packages appear to be conflicting. You'd be better off
removing them all and starting fresh from the PPA.
Jérémie
With all this installed, I still don't get it to work.
Cheers
Yan Grange
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--
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com
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