So much bad advice, in general run Flight Recorder or Censum. > With a default memory limit of 1GB (1000 MB) and working memory of about 200 MB Java has to mak

So much bad advice, in general run Flight Recorder or Censum. > With a default memory limit of 1GB (1000 MB) and working memory of about 200 MB Java has to make a full garbage collection every 4 seconds otherwise it would run out of memory. Only if all of the 200 MB make it to old gen. > Why not use incremental garbage collection? Nobody should be using -XX:+CMSIncrementalMode it exists for platforms with only one hardware thread. > the real memory usage is almost double the memory visible in Java Huh? Yes, Java uses more memory than heap and a copy-collector means half the memory of the heap is unused but I have trouble understanding this. I was in a JavaOne presentation 2013 when the presenter mentioned that Minecraft runs System.gc() in a thread all 500ms and decided I'll never touch this.