fork(2) download
copy 
  1. from concurrent.futures import ThreadPoolExecutor
  2.  
  3. def fibonacci(n):
  4.     if n < 2:
  5.         return n
  6.     a = pool.submit(fibonacci, n - 1)
  7.     b = pool.submit(fibonacci, n - 2)
  8.     return a.result() + b.result()
  9.  
  10. def main():
  11.     global pool
  12.  
  13.     N = int(input())
  14.     with ThreadPoolExecutor(2**N) as pool:
  15.         print(fibonacci(N))
  16.  
  17. main()
Runtime error #stdin #stdout #stderr 0.15s 44528KB
comments (?)
stdin
copy 
14
stdout
copy 
Standard output is empty
stderr
copy 
Traceback (most recent call last):
  File "prog.py", line 18, in <module>
    main()
  File "prog.py", line 16, in main
    print(f.result())
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 400, in result
    return self.__get_result()
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 352, in __get_result
    raise self._exception
  File "/usr/lib/python3.2/concurrent/futures/thread.py", line 54, in run
    result = self.fn(*self.args, **self.kwargs)
  File "prog.py", line 8, in fibonacci
    return a.result() + b.result()
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 400, in result
    return self.__get_result()
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 352, in __get_result
    raise self._exception
  File "/usr/lib/python3.2/concurrent/futures/thread.py", line 54, in run
    result = self.fn(*self.args, **self.kwargs)
  File "prog.py", line 8, in fibonacci
    return a.result() + b.result()
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 400, in result
    return self.__get_result()
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 352, in __get_result
    raise self._exception
  File "/usr/lib/python3.2/concurrent/futures/thread.py", line 54, in run
    result = self.fn(*self.args, **self.kwargs)
  File "prog.py", line 8, in fibonacci
    return a.result() + b.result()
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 400, in result
    return self.__get_result()
  File "/usr/lib/python3.2/concurrent/futures/_base.py", line 352, in __get_result
    raise self._exception
  File "/usr/lib/python3.2/concurrent/futures/thread.py", line 54, in run
    result = self.fn(*self.args, **self.kwargs)
  File "prog.py", line 6, in fibonacci
    a = pool.submit(fibonacci, n - 1)
  File "/usr/lib/python3.2/concurrent/futures/thread.py", line 103, in submit
    self._adjust_thread_count()
  File "/usr/lib/python3.2/concurrent/futures/thread.py", line 119, in _adjust_thread_count
    t.start()
  File "/usr/lib/python3.2/threading.py", line 683, in start
    _start_new_thread(self._bootstrap, ())
_thread.error: can't start new thread
https://ideone.com/2xxbSU
language:
Python 3 (python  3.9.5)
created:
10 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!