#36705: Repeated string concatenation is slow on some python implementations, in
particular PyPy
-------------------------------------+-------------------------------------
Reporter: Jacob Walls | Owner: Varun
Type: | Kasyap Pentamaraju
Cleanup/optimization | Status: closed
Component: Utilities | Version: dev
Severity: Normal | Resolution: fixed
Keywords: PyPy | Triage Stage: Ready for
| checkin
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Jacob Walls):
Thanks for spotting the logic change. I replied that there's a chance the
logic change is more correct: we should add a test to be sure.
I heard that Django has never supported PyPy as a deployment target.
Despite whispers of PyPy winding down, it seems to be slowly keeping up in
its own time.
For me, this change wasn't just about PyPy. I was persuaded by the linked
blog post's explanation that even in CPython adequate performance on
catastrophic string concatenation depends on a fragile optimization.
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Ticket URL: <https://code.djangoproject.com/ticket/36705#comment:12>
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