Benchmark for `get_parent_list()`

bench_get_parent_list.py

from django.conf.global_settings import INSTALLED_APPS
import django
from django.db import models
from django.conf import settings
import pyperf

settings.configure(INSTALLED_APPS= ('__main__',))
django.setup()

# models

# ParentListTests models
class CommonAncestor(models.Model):
    pass


class FirstParent(CommonAncestor):
    first_ancestor = models.OneToOneField(CommonAncestor, models.CASCADE, primary_key=True, parent_link=True)


class SecondParent(CommonAncestor):
    second_ancestor = models.OneToOneField(CommonAncestor, models.CASCADE, primary_key=True, parent_link=True)


class Child(FirstParent, SecondParent):
    pass


def test(loops):
    range_it = range(loops)
    t0 = pyperf.perf_counter()

    # repeat to reduce impact of for loop
    for loop in range_it:
        CommonAncestor._meta.get_parent_list()
        FirstParent._meta.get_parent_list()
        SecondParent._meta.get_parent_list()
        Child._meta.get_parent_list()

        CommonAncestor._meta.get_parent_list()
        FirstParent._meta.get_parent_list()
        SecondParent._meta.get_parent_list()
        Child._meta.get_parent_list()

        CommonAncestor._meta.get_parent_list()
        FirstParent._meta.get_parent_list()
        SecondParent._meta.get_parent_list()
        Child._meta.get_parent_list()

        CommonAncestor._meta.get_parent_list()
        FirstParent._meta.get_parent_list()
        SecondParent._meta.get_parent_list()
        Child._meta.get_parent_list()

        CommonAncestor._meta.get_parent_list()
        FirstParent._meta.get_parent_list()
        SecondParent._meta.get_parent_list()
        Child._meta.get_parent_list()

    return pyperf.perf_counter() - t0

runner = pyperf.Runner()
runner.bench_time_func("get_parent_list", test)

Before

.....................
get_parent_list: Mean +- std dev: 275 us +- 5 us

After

.....................
get_parent_list: Mean +- std dev: 119 us +- 3 us