Determining the right number of max_entries can be tricky. In this simple example, we know exactly how many entries we’ll be caching per post, but in a more complex setup we might only be able to guess. So it’s useful to watch the cache fill up, especially immediately before and after loading a page.
Go to the command line and cd into your Blog folder (the same folder that has “manage.py” in it).
$ python manage.py shell
>>> from django.core.cache import cache
>>> cache._max_entries
500
>>> cache._num_entries
14
Visit a new page, and you should see the number change:
>>> cache._num_entries
15
It’s important, if you have a complex system, to ensure that the maximum number of cache entries is significantly greater than the number of cache entries used per page view.
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