Python multiprocessing - How to release memory when a process is done?

Question

I encountered a weird problem while using python multiprocessing library.

My code is sketched below: I spawn a process for each \"symbol, date\" tuple. I combine th

Answer 1

You should probably call close() followed by wait() on your Pool object.

http://docs.python.org/library/multiprocessing.html#module-multiprocessing.pool

join() Wait for the worker processes to exit. One must call close() or terminate() before using join().