[lttng-dev] Tracing a userspace app from startup

[lttng-dev] Tracing a userspace app from startup

[Jones, Tim]

Hi,

I've been attempting to use LTTng to trace some apps but need to trace from their startup to shutdown. Is this possible with LTTng?

For example, I'd like to be able to run something along the lines of this:

lttng start -- <command> <args>

I've searched the docs and Google, but I can't find anything regarding this way of using LTTng!?

Cheers,

Tim
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[lttng-dev] Tracing a userspace app from startup

[Milian Wolff]

On Mittwoch, 15. Mai 2019 12:16:40 CEST Jones, Tim wrote:
> Hi,
> 
> I've been attempting to use LTTng to trace some apps but need to trace from
> their startup to shutdown. Is this possible with LTTng?
> 
> For example, I'd like to be able to run something along the lines of this:
> 
> lttng start -- <command> <args>
> 
> I've searched the docs and Google, but I can't find anything regarding this
> way of using LTTng!?

I asked this myself recently. Sadly, it's not supported. For now I'm using 
this script myself:

https://github.com/milianw/shell-helpers/blob/master/run_lttng_trace.sh

You may want to enable events explicitly, instead of enabling all of them. 
These traces can become quite large.

Cheers

-- 
Milian Wolff | milian.wolff at kdab.com | Senior Software Engineer
KDAB (Deutschland) GmbH, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt, C++ and OpenGL Experts
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