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BABELTRACE2-QUERY-(7) Babeltrace 2 manual BABELTRACE2-QUERY-(7)


babeltrace2-query-babeltrace.trace-infos - Babeltrace 2's trace infos query object


The babeltrace.trace-infos Babeltrace 2 query object indicates time range information about specific traces and their streams, and which output ports of an eventual source component will serve the messages for a given stream.

The babeltrace2-convert(1) command queries this object from all the source component classes to support the --stream-intersection feature.


The parameters for this query operation are exactly the same as you would pass as the initialization parameters of a component created from the queried component class.


The result object is an array of trace info maps (see “Trace info map”).

Trace info map

A trace info map contains:

stream-infos=STREAM-INFOS [array of stream info maps]

Stream info maps (see “Stream info map”) for this trace.

Stream info map

A stream info map contains:

range-ns=RANGE [range map]

The time range of this stream, a map containing:

begin=NS [signed integer]

Beginning time of this stream (nanoseconds since the stream class’s default clock class’s origin).

end=NS [signed integer]

End time of this stream (nanoseconds since the stream class’s default clock class’s origin).

port-name=PORT-NAME [string]

For an eventual source component initialized with the same parameters: name of the output port which serves the messages of this stream.


Result object

Example 1. Two trace infos: one with three stream infos, one with two stream infos.

- stream-infos:

- range-ns:
begin: 1509556764975082000
end: 1509557102181554400
port-name: trace0-cpu0
- range-ns:
begin: 1509556764947050800
end: 1509557102182771000
port-name: trace0-cpu1
- range-ns:
begin: 1509556764956409300
end: 1509557102182770400
port-name: trace0-cpu2 - stream-infos:
- range-ns:
begin: 1509556764918082000
end: 1509557103849928400
port-name: trace1-cpu0
- range-ns:
begin: 1509556761888820000
end: 1509557109928100400
port-name: trace1-cpu1


If you encounter any issue or usability problem, please report it on the Babeltrace bug tracker (see <>).


The Babeltrace project shares some communication channels with the LTTng project (see <>).

•Babeltrace website (see <>)

•Mailing list (see <>) for support and development:

•IRC channel (see <irc://>): #lttng on

•GitHub project (see <>)

•Continuous integration (see <>)


The Babeltrace 2 project is the result of hard work by many regular developers and occasional contributors.

The current project maintainer is Jérémie Galarneau <>.


This query object is part of the Babeltrace 2 project.

Babeltrace is distributed under the MIT license (see <>).


babeltrace2-intro(7), babeltrace2-query(1), babeltrace2-convert(1)

14 September 2019 Babeltrace 2.0.4