title: Trouble uploading big file (3Go) with Django
body: <p>I have a Django application processing files. 
  The uploading process works perfectly for small files (70 Mo). However, an error is raised when I try to upload big files (~3Go) :</p>
  
  <pre><code>Environment:
  
  
  Request Method: POST
  Request URL: http://localhost:8000/import/
  
  Django Version: 1.5.1
  Python Version: 2.7.3
  Installed Applications:
  ('django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.sites',
   'django.contrib.messages',
   'django.contrib.staticfiles',
   'django_jenkins',
   'libs',
   'bootstrapform',
   'origami',
   'debug_toolbar')
  Installed Middleware:
  ('django.middleware.common.CommonMiddleware',
   'django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware',
   'debug_toolbar.middleware.DebugToolbarMiddleware')
  
  
  Traceback:
  File "/home/antoine/workspace/server/.virtualenv/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
    187.                 response = middleware_method(request, response)
  File "/home/antoine/workspace/server/.virtualenv/local/lib/python2.7/site-packages/django/contrib/sessions/middleware.py" in process_response
    38.                     request.session.save()
  File "/home/antoine/workspace/server/.virtualenv/local/lib/python2.7/site-packages/django/contrib/sessions/backends/db.py" in save
    51.             session_data=self.encode(self._get_session(no_load=must_create)),
  File "/home/antoine/workspace/server/.virtualenv/local/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py" in encode
    86.         pickled = pickle.dumps(session_dict, pickle.HIGHEST_PROTOCOL)
  
  Exception Type: SystemError at /import/
  Exception Value: error return without exception set
  </code></pre>
  
  <p>The upload size limit is set like this : 
  <code>FILE_UPLOAD_MAX_MEMORY_SIZE = 5368709120</code></p>
  
  <p>Could you tell me if this is a django limitation, or a trouble somewhere on my side ?
  In the first case, what is the method for uploading large files ?</p>
  
  <p>EDIT : my machine has 14 Go of free RAM when it starts uploading. </p>