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4947: Replace `impls_in_trait` query with smarter use of `CrateImplDefs` r=matklad a=jonas-schievink `impls_in_trait` was allocating a whopping ~400 MB of RAM when running analysis-stats on r-a itself. Remove it, instead adding a query that computes a summary `CrateImplDefs` map for all transitive dependencies. This can probably still be made more efficient, but this already reduces the peak memory usage by 25% without much performance impact on analysis-stats. **Before**: ``` Total: 34.962107188s, 2083mb allocated 2141mb resident 422mb ImplsForTraitQuery (deps) 250mb CrateDefMapQueryQuery 147mb MacroArgQuery 140mb TraitSolveQuery (deps) 68mb InferQueryQuery (deps) 62mb ImplDatumQuery (deps) ``` **After**: ``` Total: 35.261100358s, 1520mb allocated 1569mb resident 250mb CrateDefMapQueryQuery 147mb MacroArgQuery 144mb TraitSolveQuery (deps) 68mb InferQueryQuery (deps) 61mb ImplDatumQuery (deps) 45mb BodyQuery 45mb ImplDatumQuery ``` Co-authored-by: Jonas Schievink <jonasschievink@gmail.com> |
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