#35102: Performance regression on Model.objects.count() between Django 4.2 and
5.0
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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):
If Expression.__hash__ (Expression.identity()) were to implement another
mechanism for determining a unique hash that doesn't depend upon using
`inspect.signature` the benchmark would be much faster since this is
evaluated twice. I suspect this would impact other benchmarks as well,
hash functions should be as fast as possible but I understand why that is
challenging for something like expressions. inspect.signature is a very
slow function that does a huge amount of processing to build a Signature
object for the given callable.
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Ticket URL: <https://code.djangoproject.com/ticket/35102#comment:9>
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