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Choose the Garbage Collector used by the translated program.
The recommended default is "incminimark".
- "ref": reference counting. Takes very long to translate and the result is
slow. Used only for tests. Don't use it for real RPython programs.
- "none": no GC. Leaks everything. Don't use it for real RPython
programs: the rate of leaking is immense.
- "semispace": a copying semi-space GC.
- "generation": a generational GC using the semi-space GC for the
older generation.
- "hybrid": a hybrid collector of "generation" together with a
mark-n-sweep old space
- "boehm": use the Boehm conservative GC.
- "minimark": a generational mark-n-sweep collector with good
performance. Includes page marking for large arrays.
- "incminimark": like minimark, but adds incremental major
collections. Seems to come with no performance drawback over
"minimark", so it is the default. A few recent features of PyPy
(like cpyext) are only working with this GC.
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