[lttng-dev] Current Trace File Location

[Simon Marchi]

Also:

"lttng list" will give you the existing sessions.
"lttng set-session <name>" will change the current session (ie write
that session name in .lttngrc).

On 29 October 2013 12:02, David Goulet <dgoulet at efficios.com> wrote:
> On 29 Oct (11:59:04), Michael Steppe wrote:
>> Hello,
>>
>> I am not sure if this is where I ask my questions to the developers but I
>> thought I'd give it a go.
>>
>> I am able to create a kernel trace, enable all events for the trace, start,
>> stop and destroy the trace. But let's say I have two traces running on the
>> same machine:
>>
>> [user at localhost ~]$ lttng create trace1
>> [user at localhost ~]$ lttng create trace2
>> [user at localhost ~]$ lttng create trace3
>>
>> As I am sure you know, the .lttngrc file is populated with ONLY the latest
>> created trace name (trace3).
>>
>> Now let's say I change my mind after creating these traces and wish to
>> destroy them all. If I use the destroy command...
>>
>> [user at localhost ~]$ lttng destroy
>>
>> ...with no argument, it defaults to the .lttngrc file and destroys trace3 as
>> well as the .lttngrc file. This means that the next time I run lttng
>> destroy I get the error that it cannot find the .lttngrc file and asks if I
>> created a session. Well we still have trace1 and trace2 in the background
>> somewhere because if I try to:
>>
>> [user at localhost ~]$ lttng create trace1
>>
>> I get told that there is already a trace with that name.
>>
>> My question to you is, where are all the traces stored until they are
>> destroyed? LTT obviously knows that trace1 and trace2 are still "running"
>> because it won't let me create another with the same name until I destroy
>> it. I know that I could say:
>>
>> [user at localhost ~]$ lttng destroy trace1
>> [user at localhost ~]$ lttng destroy trace2
>>
>> but I am writing an Eclipse plugin to do this tracing without the terminal
>> so the trace name will be based off of the time of day the user runs it and
>> therefore I cannot hardcode the name in.
>>
>> Is there a "destroy all" command that I am missing?
>
> lttng destroy -a :)
>
> David
>
>>
>> Thanks!!
>> Michael
>
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>
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