[lttng-dev] The JUL domain

David Goulet dgoulet at efficios.com
Fri Jan 17 11:10:49 EST 2014

On 17 Jan (15:58:15), Thibault, Daniel wrote:
>    A quick question regarding the LTTng 2.4 jul domain:
>    Does its use mean another consumer daemon or two may be launched?  Suppose I have a 64-bit system with some 32-bit apps, including both 32- and 64-bit Java.


> Suppose I run a 'tracing' group trace on the kernel, user-space and jul. Will I get five consumer daemons?  One for the kernel, one for 32-bit user-space events, one for 64-bit user-space events, one for 32-bit java.util.logging events and a last one for 64-bit java.util.logging events?

No, consumers are based on the bitness thus if 32-bit app, 64-bit app
and the kernel, you'll have two UST consumers and one kernel consumer.

The JUL domain means that you can enable Logger name in a Java
application through a Java Agent that uses a JNI library to use
lttng-ust which will register to the session daemon and have a full UST
setup process.

The Logger's data is mapped to a UST generic tracepoint (can be
expanded) so what the consumer do is the same as a UST domain.

Hope that clarifies.


> Daniel U. Thibault
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