[Answer]-Multi-threading under Apache resulting in duplicate threads

On Windows there is only one Apache child process handling requests. On non Windows systems, if using embedded mode there can be multiple processes.

Use mod_wsgi daemon and its default of a single process. See:

http://code.google.com/p/modwsgi/wiki/QuickConfigurationGuide#Delegation_To_Daemon_Process

and:

http://code.google.com/p/modwsgi/wiki/ProcessesAndThreading