#35102: Performance regression on Model.objects.count() between Django 4.2 and
5.0
-------------------------------------+-------------------------------------
Reporter: Anthony Shaw | Owner: (none)
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: 5.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Anthony Shaw):
And then with Mariusz' patches the overall speedup is 1.8x compared with
main:
{{{
Running benchmarks: query_count
Control: Django 5.1 (in git branch main)
Experiment: Django 5.1 (in git branch exp_1)
Running 'query_count' benchmark ...
Min: 0.000294 -> 0.000163: 1.8003x faster
Avg: 0.000317 -> 0.000173: 1.8301x faster
Significant (t=53.998054)
Stddev: 0.00003 -> 0.00002: 1.4805x smaller (N = 200)
}}}
And an overall improvement on 4.2
{{{
Running benchmarks: query_count
Control: Django 4.2 (in git branch 4.2)
Experiment: Django 5.1 (in git branch exp_1)
Running 'query_count' benchmark ...
Min: 0.000191 -> 0.000174: 1.0997x faster
Avg: 0.000263 -> 0.000200: 1.3143x faster
Significant (t=3.949122)
Stddev: 0.00022 -> 0.00004: 5.2520x smaller (N = 200)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/35102#comment:12>
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