Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

Time jumped forward

asked 2011-03-03 21:21:10 -0500

Lorenzo Riano
1342 ●26 ●34 ●50 http://www.eecs.berkel...

Hi folks,

I am receiving some error messages from everything that uses planning_environment (OMPL, Trajectory Filter, you name it!), namely that the joint_states messages are discarded and I should turn DEBUG on. When I look at the DEBUG messages, I see a dominant "Time jumped forward by xxx for timer of period [0.010000], resetting timer". Although I don't think that that is the problem, I was curious about this message. What does it mean? Is it bad?

BTW I am currently distributing the nodes among at least 3 computers. Although they query a local ntp server every minute, keeping them in sync is a big problem. How influential is this on the tf synchronisation problems?

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2011-03-03 22:12:04 -0500

Stefan Kohlbrecher

24361 ●173 ●299 ●444 https://www.energy-rob...

If synchronization between different contributing machines is off, this can generally cause a lot of problems with tf. The recommendation is to use chrony (http://chrony.tuxfamily.org/) instead of plain ntp for synchronization, as it is much more reliable.

There are quite a few posts on the mailing list about details: http://ros-users.122217.n3.nabble.com/template/NamlServlet.jtp?macro=search_page&node=122217&query=chrony

edit flag offensive delete link

add a comment

Question Tools

Stats

Asked: 2011-03-03 21:21:10 -0500

Seen: 1,180 times

Last updated: Mar 03 '11

Time jumped forward edit

1 Answer

Question Tools

Stats

Related questions

Time jumped forward