#16679: Speed up signals by caching the reveicers per sender
-------------------------------------+-------------------------------------
Reporter: akaariai | Owner: nobody
Type: | Status: new
Cleanup/optimization | Version: 1.3
Component: Database layer | Resolution:
(models, ORM) | Triage Stage: Accepted
Severity: Normal | Needs documentation: 0
Keywords: | Patch needs improvement: 0
Has patch: 1 | UI/UX: 0
Needs tests: 0 |
Easy pickings: 0 |
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Comment (by akaariai):
I quickly tried your patch, but didn't see performance improvement in this
case:
{{{
class A(models.Model):
pass
class B(models.Model):
pass
def recv1(*args, **kwargs):
pass
signals.pre_init.connect(recv1, sender=B, weak=False)
signals.post_init.connect(recv1, sender=B, weak=False)
for i in range(0, 1000):
A(i)
}}}
Note that the connected signals for B are slowing down A `__init__`. This
is the case where the cached signals (fast-signals2.diff) give the best
performance increase.
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Ticket URL: <https://code.djangoproject.com/ticket/16679#comment:4>
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