[lttng-dev] Live reading without using disk

[Elie Abi Saad]

2014-09-17 19:36 GMT+02:00 Julien Desfossez <jdesfossez at efficios.com>:
>
>
> For now, there is no easy way to extract the trace data directly from
> the memory. There are old prototypes and ideas to create a consumerd
> that can process the traces in memory but nothing in the mainline. I'm
> currently working on ideas around this area but nothing solid yet.
>
> So yes for now, the traces (live or snapshots) must be written on disk
> before being available to a viewer.
>
> If space is the problem (especially for the live mode), you can have a
> look at the -C and -W options of the "lttng enable-channel" command.
> They allow you to limit the maximum disk space that a trace can occupy.
> If the problem is the disk I/O, I suggest for now to have a dedicated
> disk to store the traces or extract them on the network.
> Finally, if the problem is the latency between the event produced and
> available to the viewer (and a lower footprint on the system), there is
> no easy solution there for now.

Thanks for your answer, that's all I wanted to know.

-- 
Elie Abi Saad