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Re: [tracecompass-dev] How To View Live Traces
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Hi Bernd, Michael,
On 2016-03-24 09:11 AM, Bernd Hufmann wrote:
On 03/23/2016 11:36 AM, Michael Steppe wrote:
I've been doing some more testing since I emailed you all yesterday
afternoon. Here are some things (issues) that I have noticed:
* Opened Eclipse as USER
o Created and started STANDARD UST trace
+ Folder created in /home/USER/lttng-traces/<trace_name>
*GOOD / EXPECTED*
o Created and started LIVE UST trace
+ Folder created in
/ROOT/lttng-traces/localhost/<trace_name> *BAD*
+ Unable to import LIVE UST trace to view live because
cannot access root owned files *BAD*
* Opened Eclipse as ROOT
o Created and started STANDARD UST trace
+ Folder created in /ROOT/lttng-traces/<trace_name> *GOOD /
EXPECTED*
o Created and started LIVE UST trace
+ Folder created in
/ROOT/lttng-traces/localhost/<trace_name> *GOOD / EXPECTED*
+ Able to import LIVE UST trace to view live! *GOOD / EXPECTED*
Do you have any idea why this behavior happens? Specifically the live
user trace being stored in a root owned folder?
I cannot answer this questions since it is handled by the LTTng
runtime and not by Trace Compass. Alex could you please take care of
this and bring it up with your colleagues taking care of the LTTng
runtime?
I'll take a look at it.
Cheers
On Tue, Mar 22, 2016 at 1:13 PM, Michael Steppe <msteppe91@xxxxxxxxx
<mailto:msteppe91@xxxxxxxxx>> wrote:
Ok, so I know this is frowned upon, but I opened Trace Compass as
root and was able to successfully create, start, and import a
live UST trace. I had to create a trace point first before the
trace had any metadata, but it worked! Why are the lttng commands
run as root when I open Trace Compass as user? That must be the
issue, the user traces are created in /root/lttng-traces where
the user has no access...
On Tue, Mar 22, 2016 at 1:06 PM, Michael Steppe
<msteppe91@xxxxxxxxx> wrote:
I am running trace compass as user, but the trace is saved in
/root/lttng-traces/localhost instead of what I would expect,
/home/user/lttng-traces/localhost. Now after starting the
trace and adding trace points, when I click import I get the
error:
Error initializing live trace.
Cannot create linked resource. Local location
'/root/lttng-traces/localhost/NEWustTest-20160322-170122/ust/uid/500/64-bit'
does not exist.
But I see the folder at that location...although it is owned
by root...
Just to clarify, the user is in the tracing group and has
sudo permissions for lttng commands.
On Tue, Mar 22, 2016 at 12:57 PM, Bernd Hufmann
<bernd.hufmann@xxxxxxxxxxxx
<mailto:bernd.hufmann@xxxxxxxxxxxx>> wrote:
Hi Michael
this error seems to indicate that no trace events have
been created by the application and the metadata file
hasn't been created when the live trace is imported by
you pressing the import button. After starting the trace
session could you please check the trace destination
directory if the metadata file exists. The directory
should look something like this:
${user-home}/lttng-traces/{node-name}/{session-name}${date-time}/ust/uid/45167/64-bit
Bernd
On 03/22/2016 10:49 AM, Michael Steppe wrote:
Same with a live UST trace
On Tue, Mar 22, 2016 at 10:19 AM, Michael Steppe
<msteppe91@xxxxxxxxx> wrote:
So I have updated the lttng kernel modules to 2.6.4,
the lttng ust packages to 2.6.1, and the lttng tools
packages to 2.6.5. When attempting to import the
live kernel trace I get the error I attached in the
previous email: "Error, trace has no metadada"
Any suggestions? I am coming down to the wire on
this project so any help would be great! :)
On Mon, Mar 21, 2016 at 9:16 AM, Michael Steppe
<msteppe91@xxxxxxxxx> wrote:
Sorry, I forgot to include this earlier. Here is
a screenshot of the new error I am seeing:
Inline image 2
On Mon, Mar 21, 2016 at 9:15 AM, Michael Steppe
<msteppe91@xxxxxxxxx> wrote:
All,
Here is a little update on my attempt to
view live traces in a 2.6.32 kernel. I
downloaded and built from source the
userspace-rcu (0.9.1), lttng-tools (2.6.5),
and lttng-ust (2.6.1) listed under the
"Gaia" release on LTTng's website
(http://lttng.org/download/). Meanwhile, my
co-worker is attempting to build the kernel
modules (2.6.4) that go along with the Gaia
release.
Because the issue seemed to have to do with
the "lttng create" command, I figured I
could at least test userspace live trace
viewing in Trace Compass with my old 2.4.4
kernel modules installed until my co-worker
could get me the new kernel modules. Correct
me if I am wrong but I should be able to do
this if I am just enabling userspace event
in the session...
I created a live session through the control
view and enabled all ust events. The import
button is now available to click after
starting the trace! Woohoo! Unfortunately,
regardless if I click the import button
before or after the trace is started, I get
an error saying "Error, trace has no
metadata". I figured this may be because no
userspace trace points have been created on
the system. I added a trace point manually
from the command line while the trace was
running then clicked on the import button
and still go the same error. If I click the
import button again, I get the "null
argument" error I had been getting before.
Only the first time per session when
clicking the import button do I see the "no
metadata" error.
I plan on waiting for the new kernel modules
that match my Gaia versions of the tools and
ust packages to really test this, but if
anything stands out to you guys as other
things I may need to do to in order to get
this working, help would be appreciated!
-Michael
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--
Jonathan R. Julien
Efficios
