[lttng-dev] multiple tracing sessions using relayd

[Jérémie Galarneau]

On Thu, Nov 13, 2014 at 8:57 AM, Anand Neeli <anand.neeli at gmail.com> wrote:
> Thanks for the info Daniel,
>
> Jérémie,
> Have you tried multi-session with relayd on 2.4.1?
> Also can you please give me the config you used for this?
>

I have not tried yet. I'll get back to you soon.

> For some reason my console is stuck when i try to enable channel for second
> session.
>
> Can same user run multiple session daemons? how does a channel get
> associated with a particular sessiond (if a user can run multiple sessiond)
>

A user should not run multiple session daemons (as in, under the same
UID). I contributed a patch to ensure this by using a lock file for
the 2.5 release.

Regards,
Jérémie

> Thanks,
> Anand Neeli
>
> On Wed, Nov 12, 2014 at 8:13 PM, Thibault, Daniel
> <Daniel.Thibault at drdc-rddc.gc.ca> wrote:
>>
>> > Date: Mon, 10 Nov 2014 13:02:58 -0500
>> > From: J?r?mie Galarneau <jeremie.galarneau at efficios.com>
>> > To: Anand Neeli <anand.neeli at gmail.com>
>> >
>> > > I tried to create same without relayd and it works. Am i missing
>> > > anything here?
>> > >
>> > > Although in the above example i'm enabling same/all events in session1
>> > > and session2, but i think this should work and capture same events in
>> > > both the sessions.
>> >
>> > That's the expected behaviour.
>> >
>> > Jérémie
>>
>>    With one very important caveat: the copies of the events in each
>> session will most likely bear different timestamps.  That's because the
>> timestamps capture the moments at which the event data slots are reserved in
>> the consumer buffers.
>>
>> Daniel U. Thibault
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>
>
>
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-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com