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Hi,

I asked a first question here http://answers.ros.org/question/122901/how-to-implement-offline-data-synchronization/?answer=123036#post-id-123036 but I did not have the right answer of my requirement.

In order to clarify my need, I would like to use the same call graph as in online mode (publish/subscribe mechanism) to do quality test of one algorithm or several. For a better understanding, I draw an example of a ROS nodes architecture (sorry for the link below, my karma is insufficient to publish links):

http://www.dropbox.com/s/tow3fsidlsx4yjg/ROS_Messages_synchronization.png

With this architecture in mind, I want to test the quality of each algorithm for each message. Typically, if the Algorithm 3 is too slow compare to the Algorithm 2, Algorithm2 need to wait the end of the Algorithm 3 process.

Have you already thought about a synchronize solution inside ROS? Are you going to implement this king of feature, in ROS, in a near future? Is it impossible to do that in the core?

Nicolas

Originally posted by Nicolas Vignard on ROS Answers with karma: 11 on 2014-02-27

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Ecto is a synchronous processing pipeline that can be tied into ROS. It's aimed primarily at image processing, but I suspect it can be used with other types of data as well.

Originally posted by ahendrix with karma: 47576 on 2014-02-28

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Hi, this might help you: https://github.com/lrse/batch_ros

Originally posted by Matias with karma: 122 on 2018-11-03

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