#36869: Optimise migration graph planning
-------------------------------------+-------------------------------------
Reporter: James Fysh | Owner: (none)
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: migration digraph | Triage Stage: Accepted
loader |
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Natalia Bidart):
* cc: Nick Pope (added)
Comment:
I started the triage for this ticket and I truly wanted to see the
numbers. I built a benchmarking script, and got this numbers:
* code from `main`:
{{{
compare 100 against 200 migrations (2.0x size): 2.92x time
compare 200 against 400 migrations (2.0x size): 3.40x time
compare 400 against 800 migrations (2.0x size): 3.75x time
compare 800 against 1600 migrations (2.0x size): 3.69x time
compare 1600 against 3200 migrations (2.0x size): 3.96x time
}}}
* code from the proposed PR:
{{{
compare 100 against 200 migrations (2.0x size): 1.87x time
compare 200 against 400 migrations (2.0x size): 2.01x time
compare 400 against 800 migrations (2.0x size): 2.06x time
compare 800 against 1600 migrations (2.0x size): 2.10x time
compare 1600 against 3200 migrations (2.0x size): 1.97x time
}}}
* code proposed from Nick:
{{{
compare 100 against 200 migrations (2.0x size): 1.75x time
compare 200 against 400 migrations (2.0x size): 2.22x time
compare 400 against 800 migrations (2.0x size): 2.12x time
compare 800 against 1600 migrations (2.0x size): 1.77x time
compare 1600 against 3200 migrations (2.0x size): 2.13x time
}}}
Perhaps we should consider Nick's suggestion to keep the logic a little
more straightforward?
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Ticket URL: <https://code.djangoproject.com/ticket/36869#comment:3>
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