[pypy-dev] What is the max heap size pypy can manage well?

Hi All I am interested in using pypy for production now. Due to I need to handle a large number of concurrent connections (almost 500K). I want to know the max heap that pypy can manage. As I know V8 still have a limit on 1.4G heap size, I am not sure whether pypy has a similar limitation like that. Thanks. Regards gelin yan