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Auto merge of #59626 - nnethercote:DepGraph-1.02x, r=Zoxc

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Reduce the `DepNode` pre-allocation ratio.

A code size of increase of 15% is overly generous. 2% is more realistic.

This change reduces peak memory size by 20+ MiB on some workloads.

r? @Zoxc
This commit is contained in:
bors 2019-04-15 07:12:16 +00:00
commit 1edb01b7af
1 changed files with 3 additions and 2 deletions
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5
src/librustc/dep_graph/graph.rs
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@ -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),