Optimize Target and FieldSet operations (Cherry-pick of #18917)
#18949
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Recent profiles (from pantsbuild#18911, and reproduced locally) highlighted: * `FieldSet.create` was repeatedly calling the unmemoized `_get_field_set_fields`, which used the surprisingly expensive `from typing import get_type_hints`. * This change moves type hint extraction into a memoized property. * `Target.has_fields` was doing an N^2 lookup of fields in a computed collection of registered fields. * Moved to using the `field_values` `dict` to represent the set of present fields, and removed the `plugin_fields` property (which is always incorporated into the `field_values` at construction time anyway). ---- Performance for `./pants --no-pantsd dependencies ::` in `pantsbuild/pants` improves by 9% (or 15%, if the time for rule graph solving is ignored).
kaos
approved these changes
May 9, 2023
benjyw
approved these changes
May 9, 2023
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Recent profiles (from #18911, and reproduced locally) highlighted:
FieldSet.createwas repeatedly calling the unmemoized_get_field_set_fields, which used the surprisingly expensivefrom typing import get_type_hints.Target.has_fieldswas doing an N^2 lookup of fields in a computed collection of registered fields.field_valuesdictto represent the set of present fields, and removed theplugin_fieldsproperty (which is always incorporated into thefield_valuesat construction time anyway).Performance for
./pants --no-pantsd dependencies ::inpantsbuild/pantsimproves by 9% (or 15%, if the time for rule graph solving is ignored).