Choose the Garbage Collector used by the translated program. The good performing collectors are "hybrid" and "minimark". The default is "minimark". - "ref": reference counting. Takes very long to translate and the result is slow. - "marksweep": naive mark & sweep. - "semispace": a copying semi-space GC. - "generation": a generational GC using the semi-space GC for the older generation. - "boehm": use the Boehm conservative GC. - "hybrid": a hybrid collector of "generation" together with a mark-n-sweep old space - "markcompact": a slow, but memory-efficient collector, influenced e.g. by Smalltalk systems. - "minimark": a generational mark-n-sweep collector with good performance. Includes page marking for large arrays.