[lttng-dev] Need help in converting trace data into CTF

[Mathieu Desnoyers]

----- On May 29, 2019, at 12:19 PM, Ravindra Kumar Meena <rmeena840 at gmail.com> wrote: 

> On Fri, May 17, 2019 at 12:22 AM Mathieu Desnoyers < [
> mailto:mathieu.desnoyers at efficios.com | mathieu.desnoyers at efficios.com ] >
> wrote:

>> ----- On May 16, 2019, at 1:42 AM, Ravindra Kumar Meena [
>> mailto:rmeena840 at gmail.com | rmeena840 at gmail.com ] wrote:

>> > Hi LTTng developers,
>> > I have been selected at GSoC 2019 with organization RTEMs. My project is [
>>> [ https://devel.rtems.org/ticket/3696 | https://devel.rtems.org/ticket/3696 ] |
>> > [ https://devel.rtems.org/ticket/3696 | https://devel.rtems.org/ticket/3696 ] ]

>> > The objective of the project is to convert the trace data into CTF. The trace
>> > data is already generated by the system. All that is left is to convert the
>> > trace data into CTF. I am interested in CTF because I want to send it to trace
>> > compass for analysis.

>> > Any idea how can I achieve this?

>> If you intend to produce CTF traces natively from the target, you will want to
>> look into the barectf project [1].

>> However, if your goal is to do a post-processing phase to convert traces from
>> some existing format to CTF, you will want to look into the Babeltrace project
>> [2]
>> master branch which is in preparation for Babeltrace 2.0. The approach here
>> would be to create a Babeltrace 2 source plugin which reads your trace format
>> into
>> the Babeltrace 2 intermediate representation by using the APIs exposed to
>> plugins by Babeltrace 2. Babeltrace 2 has a generic CTF sink which can serialize
>> the resulting trace intermediate representation into CTF.

>> Thanks,

>> Mathieu

>> [1] [ https://github.com/efficios/barectf | https://github.com/efficios/barectf
>> ]
>> [2] [ https://diamon.org/babeltrace/ | https://diamon.org/babeltrace/ ]

> Thanks, Mathieu for the approach. I am trying to use the babeltrace and I read
> its documentation and but I nowhere found the examples of conversion from one
> format to CTF.

> The examples would make it more clear.

> Is it possible to convert the live trace stream into CTF stream with the current
> babeltrace?

With babeltrace 1.5.x: No. 

With babeltrace master branch (currently in -pre stage before 2.0): Yes. 

Thanks, 

Mathieu 

> Thanks

> --
> Ravindra Kumar Meena ,
> B. Tech. Computer Science and Engineering,
> [ https://www.iitism.ac.in/ | Indian Institute of Technology (Indian School of
> Mines) ] , Dhanbad

-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 
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