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RCLCPP_INFO only prints when I close the program

ros2
rclcpp

asked 2020-03-03 21:22:37 -0500

mdeegan
23 ●6 ●7 ●10

I am composing multiple nodes together using a ComposableNodeContainer in the launch file. None of the RCLCPP_INFO messages appear until the program closes. RCLCPP_ERROR prints normally.

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answered 2020-03-17 11:43:18 -0500

jacobperron

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I guess you're noticing this behavior due to line buffering. Try setting the environment variable RCUTILS_CONSOLE_STDOUT_LINE_BUFFERED=1.

Note, the default behavior was changed recently so that all log messages are flushed right away (so you shouldn't experience the same issue with ROS 2 Foxy or later). Related PR: https://github.com/ros2/rcutils/pull/196

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Asked: 2020-03-03 21:22:37 -0500

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Last updated: Mar 17 '20

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RCLCPP_INFO only prints when I close the program