[lttng-dev] error in generation of trace files

[lttng-dev] error in generation of trace files

[Mariya Rampurawala]

Hello,
 I'm new to lttng. I use ubuntu 13.10. While performing basic operations,
on command lttng view, i get the following error.
[error] Cannot open any trace for reading.

[error] opening trace "/home/mariya/lttng-traces/mysession-20140227-163353"
for reading.

[error] none of the specified trace paths could be opened.


the o/p of the command "lttng-sessiond --verbose" is as follows

DEBUG3: Creating LTTng run directory: /home/mariya/.lttng [in
create_lttng_rundir() at main.c:3692]
DEBUG1: Client socket path /home/mariya/.lttng/client-lttng-sessiond [in
main() at main.c:3995]
DEBUG1: Application socket path /home/mariya/.lttng/apps-lttng-sessiond [in
main() at main.c:3996]
DEBUG1: LTTng run directory path: /home/mariya/.lttng [in main() at
main.c:3997]
Error: Already running daemon.

Could you please help me solve the error and proceed with my project?
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[lttng-dev] error in generation of trace files

[David Goulet]

On 27 Feb (16:36:24), Mariya Rampurawala wrote:
> Hello,
>  I'm new to lttng. I use ubuntu 13.10. While performing basic operations,
> on command lttng view, i get the following error.
> [error] Cannot open any trace for reading.
> 
> [error] opening trace "/home/mariya/lttng-traces/mysession-20140227-163353"
> for reading.
> 
> [error] none of the specified trace paths could be opened.
> 
> 
> the o/p of the command "lttng-sessiond --verbose" is as follows
> 
> DEBUG3: Creating LTTng run directory: /home/mariya/.lttng [in
> create_lttng_rundir() at main.c:3692]
> DEBUG1: Client socket path /home/mariya/.lttng/client-lttng-sessiond [in
> main() at main.c:3995]
> DEBUG1: Application socket path /home/mariya/.lttng/apps-lttng-sessiond [in
> main() at main.c:3996]
> DEBUG1: LTTng run directory path: /home/mariya/.lttng [in main() at
> main.c:3997]
> Error: Already running daemon.
> 
> Could you please help me solve the error and proceed with my project?

Hi,

So like the error says, you have an already dunnring daemon but that
shouldn't stop you from tracing stuff.

Can you provide step by step the command you did and from there we can
help you out more easily. The -vvv to the session daemon are good
information to have also!

Thanks!
David

> _______________________________________________
> lttng-dev mailing list
> lttng-dev at lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev

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[lttng-dev] error in generation of trace files

[David Goulet]

On 27 Feb (19:22:35), Mariya Rampurawala wrote:
> Thank you for the reply.
> So the following commands i run on my terminal:
> 
> mariya at HP:~$ lttng create mysession
> Session mysession created.
> Traces will be written in
> /home/mariya/lttng-traces/mysession-20140227-191901
> mariya at HP:~$ lttng enable-event -a -u
> All UST events are enabled in channel channel0

CCing back lttng-dev ML. If you have this problem, others have! :)

Ok so this means that you enable all user space event for that session
so you need to have an application that is instrumented with LTTng
userspace tracer (lttng-ust) in order to collect data from that app.
There are multiple examples in the git repository.

For the kernel (-a -k), you need to install lttng-modules and start
lttng-sessiond as root (or set yourself in the "tracing" group).

Hope this help!

Cheers!
David

> mariya at HP:~$ lttng start
> Tracing started for session mysession
> mariya at HP:~$ lttng stop
> Waiting for data availability
> Tracing stopped for session mysession
> mariya at HP:~$ lttng view
> Trace directory: /home/mariya/lttng-traces/mysession-20140227-191901
> 
> [error] Cannot open any trace for reading.
> 
> [error] opening trace "/home/mariya/lttng-traces/mysession-20140227-191901"
> for reading.
> 
> [error] none of the specified trace paths could be opened.
> 
> mariya at HP:~$ lttng-sessiond -vvv
> DEBUG3: Creating LTTng run directory: /home/mariya/.lttng [in
> create_lttng_rundir() at main.c:3692]
> DEBUG1: Client socket path /home/mariya/.lttng/client-lttng-sessiond [in
> main() at main.c:3995]
> DEBUG1: Application socket path /home/mariya/.lttng/apps-lttng-sessiond [in
> main() at main.c:3996]
> DEBUG1: LTTng run directory path: /home/mariya/.lttng [in main() at
> main.c:3997]
> DEBUG2: UST consumer 32 bits err path:
> /home/mariya/.lttng/ustconsumerd32/error [in main() at main.c:4006]
> DEBUG2: UST consumer 32 bits cmd path:
> /home/mariya/.lttng/ustconsumerd32/command [in main() at main.c:4008]
> DEBUG2: UST consumer 64 bits err path:
> /home/mariya/.lttng/ustconsumerd64/error [in main() at main.c:4017]
> DEBUG2: UST consumer 64 bits cmd path:
> /home/mariya/.lttng/ustconsumerd64/command [in main() at main.c:4019]
> Error: Already running daemon.
> 
> 
> 
> On Thu, Feb 27, 2014 at 7:12 PM, David Goulet <dgoulet at efficios.com> wrote:
> 
> > On 27 Feb (16:36:24), Mariya Rampurawala wrote:
> > > Hello,
> > >  I'm new to lttng. I use ubuntu 13.10. While performing basic operations,
> > > on command lttng view, i get the following error.
> > > [error] Cannot open any trace for reading.
> > >
> > > [error] opening trace
> > "/home/mariya/lttng-traces/mysession-20140227-163353"
> > > for reading.
> > >
> > > [error] none of the specified trace paths could be opened.
> > >
> > >
> > > the o/p of the command "lttng-sessiond --verbose" is as follows
> > >
> > > DEBUG3: Creating LTTng run directory: /home/mariya/.lttng [in
> > > create_lttng_rundir() at main.c:3692]
> > > DEBUG1: Client socket path /home/mariya/.lttng/client-lttng-sessiond [in
> > > main() at main.c:3995]
> > > DEBUG1: Application socket path /home/mariya/.lttng/apps-lttng-sessiond
> > [in
> > > main() at main.c:3996]
> > > DEBUG1: LTTng run directory path: /home/mariya/.lttng [in main() at
> > > main.c:3997]
> > > Error: Already running daemon.
> > >
> > > Could you please help me solve the error and proceed with my project?
> >
> > Hi,
> >
> > So like the error says, you have an already dunnring daemon but that
> > shouldn't stop you from tracing stuff.
> >
> > Can you provide step by step the command you did and from there we can
> > help you out more easily. The -vvv to the session daemon are good
> > information to have also!
> >
> > Thanks!
> > David
> >
> > > _______________________________________________
> > > lttng-dev mailing list
> > > lttng-dev at lists.lttng.org
> > > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >
> >
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[lttng-dev] error in generation of trace files

[Suchakrapani Datt Sharma]

Aah..someone is already replying. I should look at my inbox more carefully then
:-/

Ignore my previous message.

Quoting David Goulet <dgoulet at efficios.com>:

<SNIP>

> CCing back lttng-dev ML. If you have this problem, others have! :)
>
> Ok so this means that you enable all user space event for that session
> so you need to have an application that is instrumented with LTTng
> userspace tracer (lttng-ust) in order to collect data from that app.
> There are multiple examples in the git repository.
>
> For the kernel (-a -k), you need to install lttng-modules and start
> lttng-sessiond as root (or set yourself in the "tracing" group).
>
> Hope this help!

<SNIP>

--
Suchakra

[lttng-dev] error in generation of trace files

[Suchakrapani Datt Sharma]

Hi,

>  I'm new to lttng. I use ubuntu 13.10. While performing basic operations,
> on command lttng view, i get the following error.
> [error] Cannot open any trace for reading.
>
> [error] opening trace "/home/mariya/lttng-traces/mysession-20140227-163353"
> for reading.
>
> [error] none of the specified trace paths could be opened.

Have a look at the directory and see if trace events have actually been written
or not. You should see something like
/home/mariya/lttng-traces/mysession-20140227-163353/kernel/metadata (if it was
a kernel tracing session)

> the o/p of the command "lttng-sessiond --verbose" is as follows
>
> DEBUG3: Creating LTTng run directory: /home/mariya/.lttng [in
> create_lttng_rundir() at main.c:3692]
> DEBUG1: Client socket path /home/mariya/.lttng/client-lttng-sessiond [in
> main() at main.c:3995]
> DEBUG1: Application socket path /home/mariya/.lttng/apps-lttng-sessiond [in
> main() at main.c:3996]
> DEBUG1: LTTng run directory path: /home/mariya/.lttng [in main() at
> main.c:3997]
> Error: Already running daemon.

You probably did this again while the previous instance of lttng-sessiond was
already running and hence the last error. Kill currently running sessiond and
then start afresh using the verbose mode. Then proceed with usual lttng
commands and observe the debug output (more lines of debug output would be
definitely better). Please show it on the list if you need help in that.

I would also recommend you to have a look at the lttng manual as well as at the
Quickstart doc at [1] for detailed info of what the commands are doing.

[1] https://bugs.lttng.org/projects/lttng-tools/wiki

--
Suchakra