[lttng-dev] Will LTTng overwrite existing trace files after reboot, or continue where the previous instance left off?

[Amit Margalit]

Indeed the path is not different. There is no date-part in the path. I 
simply have ~/lttng-traces/ust/uid/<uid>/64-bit/ ...

Please remember that I use 2.2.0rc2 and not the latest master. 
Unfortunately, I must retain some level of stability, so if the addition 
of the date part in the path for per-uid buffers is later than 2.2.0rc2 - 
that would be the cause of the difference.

Amit

Amit Margalit
IBM XIV - Storage Reinvented
XIV-NAS Development Team
Tel. 03-689-7774
Fax. 03-689-7230



From:   David Goulet <dgoulet at efficios.com>
To:     Amit Margalit/Israel/IBM at IBMIL
Cc:     lttng-dev at lists.lttng.org
Date:   06/12/2013 05:51 PM
Subject:        Re: [lttng-dev] Will LTTng overwrite existing trace files 
after reboot, or continue where the previous instance left off?



It's possible yes if the session path is exactly the same but this is why 
we add
the date and time to the session directory so we don't end up overwriting 
old
traces with the same session name.

Can you tell me what is the full path of the session directory. It should 
look
something like (with some variations).

~/lttng-traces/fo-20130612-104743/ust/uid/1000/64-bit

Upon reboot, can you confirm that the path is different ?

Thanks!
David

Amit Margalit:
> Hi,
> 
> My situation is this:
> 
> lttng-sessiond --no-kernel
> lttng-create foo
> lttng enable-channel channel0 -u --tracefile-size 67108864 
--tracefile-count 13
> --buffers-uid --switch-timer 1000000 --num-subbuf 32
> lttng enable-event -u -a
> lttng start foo
> 
> Now this runs for a while collecting traces. I've run du -s on the trace
> directory, and saw that lttng-traces/ takes 2376KB.
> 
> The system was reboot, and upon startup, the exact same scenario as 
above is
> reproduced.
> 
> When I ran du to see the size of the lttng-traces/ directory, it was 
1740KB.
> 
> Can you please help explain this? Is LTTng overwriting the existing 
trace files?
> 
> Thanks,
> 
> Amit Margalit
> IBM XIV - /Storage Reinvented/
> XIV-NAS Development Team
> Tel. 03-689-7774
> Fax. 03-689-7230
> 
> 
> This body part will be downloaded on demand.


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