#23745: Migrations migrate is slow
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Reporter: claudep | Owner: nobody
Type: Cleanup/optimization | Status: new
Component: Migrations | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Slowness around the optimizer is tracked in #22608. This ticket is
specifically targeted to slowness with the `migrate` command. To repeat a
comment previously done in #22608, each migration in the Django test suite
is taking up 3.5 seconds. That should be improved.
Profiling migrations in the current test suite:
{{{
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 27.714 27.714
django/db/migrations/executor.py:55(migrate)
8 0.000 0.000 27.714 3.464
django/db/migrations/executor.py:83(apply_migration)
8 0.042 0.005 13.157 1.645
django/db/migrations/executor.py:128(detect_soft_applied)
8 0.000 0.000 14.500 1.812
django/db/migrations/migration.py:79(apply)
8 0.042 0.005 12.945 1.618
django/db/migrations/operations/models.py:32(database_forwards)
17 0.094 0.006 27.447 1.615
django/db/migrations/state.py:42(ProjectState.render)
21511 0.791 0.000 21.881 0.001
django/db/migrations/state.py:293(ModelState.render)
21488 0.549 0.000 5.290 0.000
django/db/migrations/state.py:164(ModelState.from_model)
21515/21511 0.766 0.000 15.861 0.001
django/db/models/base.py:63(ModelBase.__new__)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/23745>
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