On Windows (at least), sys.setrecursionlimit
isn't the full story. The hard limit is on a per-thread basis and you need to call threading.stack_size
and create a new thread once you reach a certain limit. (I think 1MB, but not sure) I've used this approach to increase it to a 64MB stack.
import sys
import threading
threading.stack_size(67108864) # 64MB stack
sys.setrecursionlimit(2 ** 20) # something real big
# you actually hit the 64MB limit first
# going by other answers, could just use 2**32-1
# only new threads get the redefined stack size
thread = threading.Thread(target=main)
thread.start()
I haven't tried to see what limits there might be on threading.stack_size
, but feel free to try... that's where you need to look.
In summary, sys.setrecursionlimit
is just a limit enforced by the interpreter itself. threading.stack_size
lets you manipulate the actual limit imposed by the OS. If you hit the latter limit first, Python will just crash completely.
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