0 Terminating due to java.lang.OutOfMemoryError: Java heap space (6) Simple benchmark. $ time for i in {1..100}; do java -Xmx128m -jar build/libs/java-11-feature-3.jar > /dev/null; done real 1m53.489s ...

all memory has been consumed on the machine. Each butterfly process wants to reserve 10G of maximum heap space. If there's less than 10G of free memory on the machine per butterfly (--CPU setting), ...