test.py

#!/usr/bin/env python
import timeit
import os
from nav.rrd.presenter import *
from nav.models.rrd import RrdDataSource

class Foo:
        def __init__(self):
                os.environ["DJANGO_SETTINGS_MODULE"] = "nav.django.settings"
                self.datasources = [x.id for x in RrdDataSource.objects.filter(rrd_file__key='interface').select_related('rrd_file')]
        def test(self):
                a = presentation()
                try:
                  for x in self.datasources:
                    a.addDs(x)
                except:
                    pass
                a.average()

        def test2(self):
                for x in self.datasources:
                        try:
                                a = presentation()
                                a.addDs(x)
                                a.average()
                        except:
                                pass


if __name__ == "__main__":
        print "Testing"
        print timeit.Timer('Foo().test2()', 'from __main__ import Foo').timeit(4)
        print timeit.Timer('Foo().test()', 'from __main__ import Foo').timeit(4)

Ville lagt initialiseringen av Foo-objektet inn i setup-delen av Timeren, så du ikke måler tiden det tar å hente inn datasource-id'ene med Django.