[On Python 3.12 subinterpreters] there's massive advantages for mixed C(++) and Python: I can now have multiple sub interpreters running concurrently and accessing the same shared state in a thread-safe C++ library.
Previously this required rewriting the whole C++ library to support either pickling (multiplying the total memory consumption by the number of cores), or support allocating everything in shared memory (which means normal C++ types like
std::string
are unusable, need to switch e.g. toboost::interprocess
).Now is sufficient to pickle a pointer to a C++ object as an integer, and it'll still be a valid pointer in the other subinterpreter.
— ynik
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