Problems with arrays of floats (lttng 2.13)

[Kienan Stewart]

Hi Herman,

On 5/9/25 6:03 AM, Herman Bruyninckx via lttng-dev wrote:
> Dear all,
> 
> I want to trace an array of floats, but I always get bogus output at the
> (Python) Babeltrace2 site...

could you give an example of the tracepoint you have setup in your code 
that doesn't work, with the corresponding output?

Could you explain what you mean by (Python) babeltrace2 site?

Are you instrumenting python code, or are you instrumenting a C/C++ 
application with lttng-ust?

> I have no problems with arrays of integers, though.
> 
> Is the float array feature not yet implemented in lttng 2.13?
> Will it be in 2.14? (Also the "BLOB" feature is useful for me.)
> 

I don't see any changes in lttng-ust for 2.14 that allow for tracepoints 
that have float arrays or blobs. lttng-modules 2.14 does add support for 
CTF 2. The support for CTF 2 in lttng-tools 2.14 will remain at an 
experimental level.

 From the release notes:

       CTF 2 output isn't enabled by default and is intended solely for
       preview and feedback purposes: having an experimental support will
       allow users to test and evaluate CTF 2 until we make it the
       default output format.


> Thanks for your help.
> 
> Herman

thanks,
kienan

[1]: 
https://git.lttng.org/?p=lttng-tools.git;a=blob_plain;f=ChangeLog;hb=11f963148df9597de6d891d96d748bae5ced7149