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Trim capacity of piggier allocations #806

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Merged
frankmcsherry merged 1 commit into from
Jun 12, 2026
+9 −0
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Trim capacity of piggier allocations #806

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9 changes: 9 additions & 0 deletions timely/src/dataflow/operators/generic/builder_rc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,15 @@ impl<'scope, T: Timestamp> OperatorBuilder<'scope, T> {

let mut logic = constructor(self.mint_capabilities());

// These vectors grew by `push` from empty, reserving capacity four; ports
// are few and the vectors live as long as the operator, so trim the excess.
// The trade is one reallocation per vector at build time for memory
// proportional to ports, rather than capacity, thereafter.
self.frontier.shrink_to_fit();
self.consumed.shrink_to_fit();
self.produced.shrink_to_fit();
self.internal.borrow_mut().shrink_to_fit();

let mut bookkeeping = ProgressBookkeeping {
frontier: self.frontier,
consumed: self.consumed,
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