GSoC Project | Basic Support for Trace Compass

[Ravindra Kumar Meena]

On Wed, Jun 5, 2019 at 11:03 AM Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 04/06/2019 19:26, Ravindra Kumar Meena wrote:
> > Hi Sebastian,
> >
> > I am in regular touch with Babeltrace community to figure out the
> > solution for conversion of trace data into CTF. I came to the
> > conclusion that current version 1.5.6 of Babeltrace does not have a
> > feature to convert live trace stream into CTF(we already had a
> > discussion about it). However, this feature is currently available in
> > Babeltrace 2.0(master branch) but it is currently in pre-stage.
> >
> > The approach they shared is that after post-processing phase to
> > convert traces from some existing format to CTF we have to create a
> > Babeltrace 2 source plugin which reads our 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.
> >
> > The conversation I had between them in May is:
> > https://lists.lttng.org/pipermail/lttng-dev/2019-May/028944.html
> >
> > and this months conversation is:
> > https://lists.lttng.org/pipermail/lttng-dev/2019-June/029022.html
> >
> > Please have a look at the above thread. The community is very helpful
> > they have even shared a decoder(source plugin) example(you can see
> > them in the thread itself) which is necessary for whatever is produced
> > as trace output to convert into CTF. I will have a look at it.
>
> Thanks for the summary. The Babeltrace 2 source plugin look like the way
> to go.
>
Okay. I will try the decoder(source plugin) example.

>
> >
> > I also came to know that Trace Compass does not support live
> > traces. It is made for post-mortem analyses, so it works only on
> > complete trace. They briefly supported live traces a few years back,
> > but that made the code much more complicated, so this support was
> > dropped. TraceCompass is not made for trace monitoring!
>
> Hm, interesting. This limitation is not really visible from the
> marketing sites.
>
Yes. The community itself confirmed it.

>
> >
> > You can view the whole conversation here(I did this during application
> > period):
> > https://lists.lttng.org/pipermail/lttng-dev/2019-March/028677.html
>
> In the e-mail a session rotation is mentioned. This doesn't sound that
> bad. At the moment this is not really important. We need the basics first.
>
Okay

>
> >
> > So, in my point of view, we should stick with the post-processing
> > method. We should store the traces in the disk and then convert it to
> CTF.
>
> I would try to concentrate on a Babeltrace 2 source plugin. If it works
> we should try to upstream it to:
>
> https://github.com/efficios/babeltrace/tree/master/plugins

Okay. sure :)

>
>
> Alternatively, you can try to write the converter using support from
> barectf.
>
Okay. I am currently reading its documentation. I will try the examples
first.

>
>

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