[lttng-dev] scale numbers for LTTNG

[vjanandr85@gmail.com (Vijay Anand)]

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Could anyone please let us know how do we go about this ?

Regards,
Vijay

On Tue, May 24, 2016 at 11:31 AM, Vijay Anand <vjanandr85 at gmail.com> wrote:

> Hello Folks,
>
> We have been evaluating LTTNG for use in our production systems for user
> space tracing. We have evaluated most of the features supported by LTTNG
> and very much see a value add LTTNG brings into our debugging
> infrastructure.
>
>    - Our current requirement is to trace Userspace programs running on
>    linux.
>    - Each of the linux processes define their own tracepoint providers.
>    - We would like to trace event histories of each process independently.
>    - We could potentially have 1000s of such processes running
>    simultaneously.
>    - We concluded on using a session/channel to trace one tracepoint
>    provider corresponding to a unique process.
>       - But I understand we could also create one system wide session and
>       use channels to trace each of the providers. Either of the approaches seems
>       to work for us.
>    - But upon evaluating I see that we could create only 25 active
>    process-sessions and not traces from all the processes are logged.
>       - Please note I have tried increasing the buffer size and the
>       number of buffers. This doesn't help.
>       - Each of the process trace 52 events at and interval of 1 second
>       each.
>    - I have evaluated this with lttng in session,live and snapshot modes
>    and I have not been getting favourable.
>
> Could you folks share the scale numbers that LTTNG supports, especially
> when it comes to tracing user space programs ?
>
> Regards,
> Vijay
> ​​
>
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