Android source code compile error: “Try increasing heap size with java option '-Xmx'”

Question

Error happens when I try to compile Android source code(Sourcecode-version: 6.0.1; RAM: 6G; host system: ubuntu 14.04),log is below:

including ./system/netd/         


        

Answer 1

This was also my problem: the java default Xmx setting was already close to 4GB (precisely: 4011MB) so the issue was rather the number of concurrent jack servers running. My machine had 8 CPUs but only 16GB of RAM, but would have required 32GB (8*4=32).

My (slightly more dynamic) solution:

MAX=$(($(free -g | awk '/^Mem:/{print $NF}') / 4))
if [ $MAX -le 0 ]; then
    MAX=1
fi
echo "SERVER_NB_COMPILE=$MAX" >> ~/.jack
mkdir -p ~/.jack-server
echo "jack.server.max-service=$MAX" >> ~/.jack-server/config.properties

It adds the MAX number of jack server to both the old-location and new-location based on the android official doc:

Jack Troubleshooting: If your computer becomes unresponsive during compilation or if you experience Jack compilations failing on “Out of memory error”, you can improve the situation by reducing the number of Jack simultaneous compilations by editing your $HOME/.jack and changing SERVER_NB_COMPILE to a lower value. https://source.android.com/source/jack.html