#24743: Django 1.8.1 migrations are actually slower than 1.8?
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Reporter: pzrq | Owner: MarkusH
Type: Cleanup/optimization | Status: assigned
Component: Migrations | Version: 1.8
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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Changes (by mjacksonw):
* cc: mjacksonw (added)
Comment:
We've been frustrated by this issue since 1.8 hit, seeing the same impacts
as previous posters – the "Rendering model states" step taking several
minutes when running fresh, which most notably impacts our testing
environments.
Our current "workaround," if you can call it that, is skipping migrations
in testing except when testing our master branch, and squashing migrations
as much as possible. Still, more than half of the time it takes to run our
tests is consumed by this "Rendering model states" step.
I tossed in MarkusH's PR (mentioned in comment:9) this morning, and ran
`migrate` against a fresh database three times against stock 1.8.3, and
three times with the changes from the PR:
1.8.3 – Min: 4m56s, Max: 5m32s, Avg: 5m26s
PR – Min: 32s, Max: 39s, Avg: 34s
Specifically, the Rendering models states step went from about 4.5 mins to
three or four seconds.
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Ticket URL: <https://code.djangoproject.com/ticket/24743#comment:14>
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