the stm-gc can be run without the STM in a way that's thread safe and does not have the STM overhead. It's almost as good as the PyPy GC (it's missing a few opt

the stm-gc can be run without the STM in a way that's thread safe and does not have the STM overhead. It's almost as good as the PyPy GC (it's missing a few optimizations and it's not incremental, but can be made to work).