[lttng-dev] lttng create --output problem

[Ettore Del Negro]

Hello,
actually 'lttng create --output dir session_name' should at least create
an empty directory with the chosen name. First of all try not to choose
an already existing directory so you can check whether it is created or not.

Anyway, i just noticed a problem with relative paths:
(~)> lttng
LTTng Trace Control 2.0.0-rc2
(~)> lttng create --output traces session
Error: Create directory failed
(~)> lttng create --output ./traces session
Error: Create directory failed
(~)> lttng create --output /root/traces session
Session session created.
Traces will be written in /root/traces

Is this expected?

Regards,
Ettore

On 3/4/2012 10:11 PM, David Goulet wrote:
> Hi Ryan,
>
> Well, the --output works on our test suites so it might be something
> you do that
> does not create the trace.
>
> Simply using create, start and stop will produce nothing. You have to
> at least
> enable events for trace files to be created since they are opened by
> the consumer.
>
> Can you try "lttng enable-events -a -k" (enabling all kernel events)
> after the
> create session and tell me if it works for you? (or use user space
> tracing,
> whatever works for you).
>
> If not, add "-vvv" to the lttng command for debug output and also for the
> session daemon.
>
> # lttng-sessiond -vvv
> # lttng -vvv ...
>
> Thanks!
> David
>
> On 12-04-03 04:02 PM, Ryan.Kyser at jci.com wrote:
>
> > Whenever I try using the --output flag for creating a new session,
> it doesn't
> > seem to use the location specified. Additionally, if I do a find on
> the entire
> > file system, no files are found that start with session name
> specified. This
> > seems like a bug to me ... or am I doing something wrong?
>
> > //---------------------------------------
> > // Log
> > //---------------------------------------
>
> > / # lttng create --output /tmp new3
> > Session new3 created.
> > Traces will be written in /tmp
> > / # lttng start
> > Tracing started for session new3
> > / # lttng stop
> > Tracing stopped for session new3
> > / # ls /tmp
> > wayland-0       wayland-0.lock
>
>
> > Thank you,
> > Ryan Kyser
>
>
>
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>
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