#24670: Django migrations are not scaling well with number of operations in
migration
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Reporter: kurevin | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: migrations | Triage Stage:
optimization | Unreviewed
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 kurevin):
* cc: kurevin (added)
Comment:
knbk, thanks for the useful links!
I was actually looking for performance improvements over Django 1.7.7,
which we are currently using. Our 1.7.7 has few major optimizations
backported from early 1.8, but it still slow, we might try to backport
some of mentioned tickets.
Just a guess if you are looking for more improvements - it seems that
runner does not cache inter-operation states, given that rendering time
and migration running time match quite closely, and there is a lot of
calls to state_forwards of AddField operation, 30 times more than actual
number of operations, similarly the numbers of calls to render_multiple is
about 3 times more, but it might be just previous migrations.
It would also be cool if django would not use inter-operation states at
all or would allow some kind of merged operation, that would not waste
time to compute many states for every small change.
--
Ticket URL: <https://code.djangoproject.com/ticket/24670#comment:2>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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