Improve Element#attribute implementation as 6500x faster
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`Element#namespaces` is heavy method because this method needs to traverse all ancestors of the element. `Element#attribute` calls `namespaces` redundantly, so it is much slower. This commit reduces `namespaces` calls in `Element#attribute`. Also, this commit removes a redundant `respond_to?` because `namespaces` must return `Hash` in the current implementation.
kou
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Jun 13, 2024
benchmark/attribute.yaml
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| attribute_with_ns: | | ||
| deepest_node.attribute("with_ns", "xyz") | ||
| attribute_without_ns: | |
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attribute_ is redundant because this file is attribute.yaml.
Can we use with_ns/without_ns or something?
| else | ||
| prefix = namespaces.index(namespace) if namespace | ||
| end | ||
| prefix = namespaces.key(namespace) if namespace |
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Suggested change
| prefix = namespaces.key(namespace) if namespace | |
| prefix = namespaces[namespace] if namespace |
may be faster than namespaces.key(namespace).
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namespaces.key(namespace) means namespaces.invert[namespace]. Your suggestion changes the code's meaning.
Co-authored-by: Sutou Kouhei <[email protected]>
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Element#namespacesis heavy method because this method needs to traverse all ancestors of the element.Element#attributecallsnamespacesredundantly, so it is much slower.This PR reduces
namespacescalls inElement#attribute. Also, this PR removes a redundantrespond_to?becausenamespacesmust returnHashin the current implementation.Below is the result of a benchmark for this on my laptop.
This result shows that
Element#attributeis now 6500x faster than the old implementation ifnamespaceis not supplied.It seems strange that it is slower when YJIT is enabled, but we believe this is a separate issue.
Thank you.