There’s a common GC anti-pattern that many new Pony programmers accidentally stumble across. Usually, this results in a skyrocketing memory usage in their test program and questions on the mailing list and IRC as to why Pony isn’t working correctly. It is, in fact, working correctly, albeit not obviously.
Garbage Collection in the world at large Garbage collection, in most languages, can run at any time. Your program can be paused so that memory can be freed up.