Django error: too many open files

Question

I'm using Anaconda python and I'm trying to run a simple Django server using the official documentation. When I run python manage.py runserver I get this error

Nuseirs-MacBook-Pro:anothertry nyassin$ python manage.py runserver
Validating models...

0 errors found
November 06, 2013 - 18:27:10
Django version 1.7.dev20131105182658, using settings 'anothertry.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/nyassin/django-trunk/django/core/management/__init__.py", line 416, in execute_from_command_line
    utility.execute()
  File "/Users/nyassin/django-trunk/django/core/management/__init__.py", line 408, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/nyassin/django-trunk/django/core/management/base.py", line 244, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Users/nyassin/django-trunk/django/core/management/base.py", line 291, in execute
    output = self.handle(*args, **options)
  File "/Users/nyassin/django-trunk/django/core/management/commands/runserver.py", line 76, in handle
    self.run(*args, **options)
  File "/Users/nyassin/django-trunk/django/core/management/commands/runserver.py", line 85, in run
    autoreload.main(self.inner_run, args, options)
  File "/Users/nyassin/django-trunk/django/utils/autoreload.py", line 359, in main
    reloader(wrapped_main_func, args, kwargs)
  File "/Users/nyassin/django-trunk/django/utils/autoreload.py", line 325, in python_reloader
    reloader_thread()
  File "/Users/nyassin/django-trunk/django/utils/autoreload.py", line 304, in reloader_thread
    if fn():
  File "/Users/nyassin/django-trunk/django/utils/autoreload.py", line 217, in kqueue_code_changed
    new_descriptors = set(open(filename) for filename in new_filenames)
  File "/Users/nyassin/django-trunk/django/utils/autoreload.py", line 217, in <genexpr>
    new_descriptors = set(open(filename) for filename in new_filenames)
IOError: [Errno 24] Too many open files: '//anaconda/lib/python2.7/lib-dynload/resource.so'

Any ideas what might be causing this?

Answer 1

It's an operating system error. The maximum number of open files is limited. Try to find where you open files and forget to close them.

Open less file descriptors at once.

set(open(filename) for filename in new_filenames)

is where the error occurs.