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ros-arm-notes

Notes on ROS for Arm / Embedded Systems

I've had some interesting differences in my experience using ROS on the desktop and on embedded systems. Typically these differences stem from the difference in computing resources (disk, speed, memory, etc.). I have decided to document my experiences here.

Problem 1: Internal compiler error

I had been recently using an Odroid XU3 which includes 4 Arm-Cortex processor cores (armhf – arm7). When compiling ROS packages on the Odroid I started getting “g++ compiler internal error….” messages. These messages are uninformative and they indicate no recourse other than “file a bug report.” Under further investigation I found that, by default, “catkin_make” command uses all cores to compile code in parallel. Actually “catkin_make” was spawning 1.5*4cores = 6 compile processes. This was this pounding on the processor and other compute resources for this embedded system which was causing the errors. I believe out-of-memory or related errors were occurring but it's impossible to know.

Problem 1: Fix

I changed my invokation of “catkin_make” to be “catkin_make -j 2” and similarly any “make” call I changed to “make -j 2”. The “-j 2” argument restricts compilation to two threads. I initially tried “-j 1” to restrict compilation to a single thread and this worked to some extent but I could not get ROS to generate needed message header files no matter how I indicated this dependency. By creating 2 threads, even though one thread dies (the one compiling my package without the needed include file for my message) the second thread actually generates the include file successfully. Hence, I was able to circumvent this problem by having 2 parallel compiling threads.

After coping with these issues, my compilation problems went away.

ros-arm-notes.txt · Last modified: 2015/09/18 20:54 by arwillis