[lttng-dev] Error while enabling multiple channel for same session

[Jérémie Galarneau]

Hi Shirish,

Interesting issue. It seems that the session daemon crashed at some point
during the execution script. Can you launch the session daemon manually in
verbose mode and provide the output along with the version of LTTng being
used?

Use:
$ lttng-sessiond -vvv

Also, can you check if a core dump is being generated?

Regards,
Jérémie

On Thu, Apr 30, 2015 at 12:23 PM, shirish gajera <gajerashirish at gmail.com>
wrote:

> Hi,
>
> I want to enable multiple(50) channel for the same session, below is my
> script doing the same.
> Single channel with the same script  is working fine. But, when I tried to
> enable multiple channel for the same session it's giving me error.
>
> Here is what I found
> 1) I have 50 channel in my db files and it's failing at 13th channel
> create command, below is the log
>        ...12 channel creation successful
>        Spawning a session daemon
>        Warning: Could not get lock file /var/run/lttng/lttng-sessiond.lck,
> another instance is running.
>        Error: Session daemon died (exit status 1)
>        Spawning a session daemon
>        Warning: Could not get lock file /var/run/lttng/lttng-sessiond.lck,
> another instance is running.
>        Error: Session daemon died (exit status 1)
>        1
>        failed!
>
> Let me know if question is not clear.
>
> my lttng script
> --------------------------------------------
> lttng create -o /root/data/tracing --snapshot TEST
> while IFS=, read EVENTNAME CHANNELNAME BUFFERSIZE
> do
> lttng enable-channel --userspace --tracefile-size ${BUFFERSIZE}K
> --tracefile-count 1 --overwrite ${CHANNELNAME}
> lttng enable-event -u ${EVENTNAME} --loglevel ERR -c ${CHANNELNAME}
> lttng enable-event -u ${EVENTNAME} --loglevel CRIT -c ${CHANNELNAME}
> done < demo_lttngdb
> lttng start
>
>
> my demo_lttngdb file
> -------------------------------------------
> channel1,channel1,65535
> channel2*,channel2,4096
> channel3*,channel3,4096
> channel4*,channel4,4096
> channel5*,channel5,4096
> channel6*,channel6,4096
> channel7*,channel7,4096
> channel8*,channel8,4096
> channel9*,channel9,8192
> channel10*,channel10,4096
> channel11*,channel11,4096
> channel12*,channel12,4096
> channel13*,channel13,4096
> channel14*,channel14,4096
> channel15*,channel15,4096
> .............
> .............
> .............
> channel48*,channel48,4096
>
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>
>


-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com
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