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.
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.
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.
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
Alternatively, you can try to write the converter using support from
barectf.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.hu...@embedded-brains.de
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Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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