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Asked: 2026-06-17T05:38:11+00:00

I’m developing a Google App Engine application with Python and Webapp2. For this question,

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I’m developing a Google App Engine application with Python and Webapp2. For this question, the relevant parts are:

import webapp2

my_object = MyClass()

class MainPage(webapp2.RequestHandler):
  def get(self):
    # do stuff

app = webapp2.WSGIApplication([
    ('/', MainPage)
], debug=True)

So, every time my app is accesed, MainPage request handler takes care of the request. Let’s assume there are 100 users using the app at a given moment. My questions are:

  • How many webapp2.WSGIApplication instances are created? Just 1? 100? (If I understood WSGI, I think that just 1)
  • How many MyClass instances are created?
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1 Answer

  1. Editorial Team

    On the Google App Engine, count on 100 instances of both MainPage() and MyClass being created; each user visiting your site potentially is routed to a different machine in the vast Google cloud.

    Run locally, MyClass will be instantiated once per process; some WSGI servers run multiple procsses (forking) to handle incoming requests. A MainPage itstance is created for each incoming request (so 100 times).

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