[lttng-dev] scale numbers for LTTNG

[jonathan.r.julien@gmail.com (Jonathan Rajotte)]

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Hi Vijay,

Could you share with us a test program or details on how you evaluated
those limitation ?

Thanks

On Thu, May 26, 2016 at 8:23 AM, Vijay Anand <vjanandr85 at gmail.com> wrote:

> 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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-- 
Jonathan Rajotte Julien
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