[lttng-dev] No events generated for custom channel

Mathieu Desnoyers mathieu.desnoyers at efficios.com
Thu May 10 15:59:44 EDT 2018

----- On May 10, 2018, at 2:51 PM, Shehab Elsayed <shehabyomn at gmail.com> wrote: 

> Hi All,

> I am running into a problem with creating a custom channel. It seems that once
> the total size of sub-buffers hits 512M no events are being generated.

> I tried creating a channel with 2 sub-buffers, 256M each, but when I check the
> generated traces with babeltrace , it complains that there are no valid traces.
> The same problem happens if I use a single 512M sub-buffer.

> However, If I use only 1 sub-buffer of size 256M, a trace is generated but some
> events are discarded (which I am really trying to avoid).

> I have enabled LTTNG _ UST _DEBUG and attached the output for both 2,256M and
> 1,256M cases.

> Any suggestions on how to solve this problem?

Please provide detailed commands used to setup tracing for each case. 

Which lttng components versions are you using ? 

Please provide the verbose logs of lttng-sessiond and lttng-consumerd as well. 

You should also double-check that you have enough space in /dev/shm. 



> Thanks,
> Shehab

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Mathieu Desnoyers 
EfficiOS Inc. 
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