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Ros eats up RAM while recording rosbag remotely

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I am running my ros application on a robot (arm) with limited RAM (1 GB). I configured my robot as the rosmaster. The rosbag recording was happening on my local linux machine whoser Ros master was the robot. Whenever I start my rosbag record, I can see that the available RAM space on my arm board shoots down eventually causing a bad alloc error. I do not understand why invoking a subscriber (rosbag) on my local computer would consume RAM on the robot. Any thoughts or pointers would be much appreciated. This is a cross compiled ros kinetic version on QNX running within a realtime loop. The data to be sent over to the ros are written to a lock free ring buffer from which ros publisher running on a separate thread reads and publishes.

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