Maps are slow #3113
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Maps are slow #3113
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joe-elliott
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mapno,
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electron0zero,
ie-pham and
stoewer
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Benchmarks: |
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stoewer
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Nov 14, 2023
| func (s *span) Attributes() map[traceql.Attribute]traceql.Static { | ||
| return s.attributes | ||
| func (s *span) AllAttributes() map[traceql.Attribute]traceql.Static { | ||
| atts := make(map[traceql.Attribute]traceql.Static, len(s.spanAttrs)+len(s.resourceAttrs)+len(s.traceAttrs)) |
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If I'm not mistaken AllAttributes() is currently only called once per span. I'm still wondering if it makes sense to cache atts in the span and skip the copying for consecutive calls to avoid future performance issues
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I didn't want to cache it b/c it's possible to have attributes change between calls to AllAttributes(), but it is a very expensive call and this PR works only b/c we scan so many more spans then we turn them into the results metadata.
I added a comment here to hopefully prevent abuse of AllAttributes():
but that's not a great safeguard.
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Here are my benchmark results on a 5GB block from ops: |
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Signed-off-by: Joe Elliott <[email protected]>
Signed-off-by: Joe Elliott <[email protected]>
Signed-off-by: Joe Elliott <[email protected]>
Signed-off-by: Joe Elliott <[email protected]>
Signed-off-by: Joe Elliott <[email protected]>
Signed-off-by: Joe Elliott <[email protected]>
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This PR improves performance of queries that hit the engine layer by reducing allocations and map iterations. It swaps a map of all attributes in the span struct for slices at the span, resource and trace levels.
The AttributeFor function is quite important. It tests the appropriate slices if a scope is provided. Otherwise it checks the slices by attribute name only in order of precedence. This is to replicate this behavior which used to exist in the engine.
Other Changes
AttributeFor()andAllAttributes()method. Unfortunately the building of trace metadata requires getting all of the attributes and iterating through them. TheAllAttributes()method has terrible performance and should generally not be called.AttributeFor()method. This is more permissive as it first checks for direct matches and then extends its search to check the individual levels by name.Benchmarks below!