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Reduce the DepNode pre-allocation ratio. #59626

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Apr 15, 2019
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Reduce the DepNode pre-allocation ratio. #59626

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5 changes: 3 additions & 2 deletions src/librustc/dep_graph/graph.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -992,8 +992,9 @@ impl CurrentDepGraph {

// Pre-allocate the dep node structures. We over-allocate a little so
// that we hopefully don't have to re-allocate during this compilation
// session.
let new_node_count_estimate = (prev_graph_node_count * 115) / 100;
// session. The over-allocation is 2% plus a small constant to account
// for the fact that in very small crates 2% might not be enough.
let new_node_count_estimate = (prev_graph_node_count * 102) / 100 + 200;

CurrentDepGraph {
data: IndexVec::with_capacity(new_node_count_estimate),
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