[ros-users] topic queue

Christian Verbeek verbeek at servicerobotics.eu
Thu May 5 07:16:14 UTC 2011

Actually I am doing ROS_INFO_STREAM in one node three times. With
rostopic echo /rosout_agg I see all three messages. With my subscriber I
only see the last message, when calling spinOnce not fast enough. So
this can not be an issue of the queue filling up.


Am 04.05.2011 20:06, schrieb Troy Straszheim:
> On Mon, May 2, 2011 at 1:10 AM, Christian Verbeek
> <verbeek at servicerobotics.eu <mailto:verbeek at servicerobotics.eu>> wrote:
>     Dear all,
>     I am missing message when subscribing to /rosout
>     _log_sub = _node.subscribe( "/rosout", 100, &ROSHandler::logCallback,
>     this );
>     I do call ros::spinOnce() approximately every 20ms. When I call
>     spinOnce
>     as fast as possible (in a loop) then no messages are lost. But then my
>     app needs 60% of the CPU so that is not really desirable.
> If messages are coming in at > 50Hz, one would expect to drop messages
> here, once the buffer of 100 fills up.  No?  Just trying to establish
> if there is a bug here or not.   I suppose a way to check the size of
> the incoming queue would be nice... there is a ticket on this already.
> Troy
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