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Rollup merge of #50565 - nnethercote:try_mark_green, r=michaelwoerister

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Use SmallVec for DepNodeIndex within dep_graph.

This avoids a decent number of allocations, enough to speed up
incremental runs of many rustc-benchmarks, the best by 2%.

Here are the rustc-perf benchmarks that showed an improvement of at least 1% on one run:
```
unused-warnings-check
	avg: -1.7%	min: -2.4%	max: 0.0%
unused-warnings-opt
	avg: -1.4%	min: -2.0%	max: 0.0%
unused-warnings
	avg: -1.4%	min: -2.0%	max: -0.0%
tokio-webpush-simple-check
	avg: -1.0%	min: -1.7%	max: 0.0%
futures-opt
	avg: -0.9%	min: -1.6%	max: 0.0%
encoding
	avg: -1.2%	min: -1.6%	max: -0.6%
encoding-check
	avg: -0.9%	min: -1.6%	max: 0.0%
encoding-opt
	avg: -0.8%	min: -1.6%	max: -0.1%
futures
	avg: -0.9%	min: -1.5%	max: 0.0%
futures-check
	avg: -0.9%	min: -1.5%	max: 0.1%
regression-31157-check
	avg: -0.9%	min: -1.5%	max: 0.0%
regex
	avg: -0.6%	min: -1.4%	max: 0.0%
regression-31157-opt
	avg: -0.5%	min: -1.4%	max: 0.1%
regression-31157
	avg: -0.7%	min: -1.4%	max: 0.2%
regex-opt
	avg: -0.6%	min: -1.4%	max: 0.1%
hyper-check
	avg: -0.8%	min: -1.4%	max: -0.1%
regex-check
	avg: -1.0%	min: -1.4%	max: 0.0%
hyper-opt
	avg: -0.7%	min: -1.4%	max: -0.1%
hyper
	avg: -0.7%	min: -1.3%	max: 0.1%
piston-image-opt
	avg: -0.4%	min: -1.3%	max: 0.0%
tokio-webpush-simple-opt
	avg: -0.3%	min: -1.3%	max: 0.0%
piston-image-check
	avg: -0.5%	min: -1.3%	max: -0.0%
syn-opt
	avg: -0.5%	min: -1.3%	max: 0.0%
clap-rs-check
	avg: -0.3%	min: -1.3%	max: 0.2%
piston-image
	avg: -0.5%	min: -1.2%	max: 0.1%
syn
	avg: -0.5%	min: -1.2%	max: 0.1%
syn-check
	avg: -0.6%	min: -1.2%	max: -0.1%
issue-46449-opt
	avg: -0.4%	min: -1.2%	max: -0.1%
parser-check
	avg: -0.7%	min: -1.2%	max: 0.1%
issue-46449
	avg: -0.5%	min: -1.2%	max: -0.0%
```
This commit is contained in:
Alex Crichton 2018-05-10 11:35:27 -05:00 • committed by GitHub
commit e23ec4b6f0
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1 changed files with 11 additions and 10 deletions
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21
src/librustc/dep_graph/graph.rs
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@ -12,6 +12,7 @@ use errors::DiagnosticBuilder;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::indexed_vec::{Idx, IndexVec};
use rustc_data_structures::small_vec::SmallVec;
use rustc_data_structures::sync::{Lrc, RwLock, ReadGuard, Lock};
use std::env;
use std::hash::Hash;
@ -132,7 +133,7 @@ impl DepGraph {
let mut edges = Vec::new();
for (index, edge_targets) in current_dep_graph.edges.iter_enumerated() {
let from = current_dep_graph.nodes[index];
for &edge_target in edge_targets {
for &edge_target in edge_targets.iter() {
let to = current_dep_graph.nodes[edge_target];
edges.push((from, to));
}
@ -210,7 +211,7 @@ impl DepGraph {
self.with_task_impl(key, cx, arg, false, task,
|key| OpenTask::Regular(Lock::new(RegularOpenTask {
node: key,
reads: Vec::new(),
reads: SmallVec::new(),
read_set: FxHashSet(),
})),
|data, key, task| data.borrow_mut().complete_task(key, task))
@ -231,7 +232,7 @@ impl DepGraph {
self.with_task_impl(key, cx, input, true, identity_fn,
|_| OpenTask::Ignore,
|data, key, _| data.borrow_mut().alloc_node(key, Vec::new()))
|data, key, _| data.borrow_mut().alloc_node(key, SmallVec::new()))
}
fn with_task_impl<'gcx, C, A, R>(
@ -354,7 +355,7 @@ impl DepGraph {
if let Some(ref data) = self.data {
let (result, open_task) = ty::tls::with_context(|icx| {
let task = OpenTask::Anon(Lock::new(AnonOpenTask {
reads: Vec::new(),
reads: SmallVec::new(),
read_set: FxHashSet(),
}));
@ -614,7 +615,7 @@ impl DepGraph {
debug_assert!(data.colors.borrow().get(prev_dep_node_index).is_none());
let mut current_deps = Vec::new();
let mut current_deps = SmallVec::new();
for &dep_dep_node_index in prev_deps {
let dep_dep_node_color = data.colors.borrow().get(dep_dep_node_index);
@ -911,7 +912,7 @@ pub enum WorkProductFileKind {
pub(super) struct CurrentDepGraph {
nodes: IndexVec<DepNodeIndex, DepNode>,
edges: IndexVec<DepNodeIndex, Vec<DepNodeIndex>>,
edges: IndexVec<DepNodeIndex, SmallVec<[DepNodeIndex; 8]>>,
node_to_node_index: FxHashMap<DepNode, DepNodeIndex>,
forbidden_edge: Option<EdgeFilter>,
@ -1049,7 +1050,7 @@ impl CurrentDepGraph {
} = task {
debug_assert_eq!(node, key);
let krate_idx = self.node_to_node_index[&DepNode::new_no_params(DepKind::Krate)];
self.alloc_node(node, vec![krate_idx])
self.alloc_node(node, SmallVec::one(krate_idx))
} else {
bug!("complete_eval_always_task() - Expected eval always task to be popped");
}
@ -1095,7 +1096,7 @@ impl CurrentDepGraph {
fn alloc_node(&mut self,
dep_node: DepNode,
edges: Vec<DepNodeIndex>)
edges: SmallVec<[DepNodeIndex; 8]>)
-> DepNodeIndex {
debug_assert_eq!(self.edges.len(), self.nodes.len());
debug_assert_eq!(self.node_to_node_index.len(), self.nodes.len());
@ -1110,12 +1111,12 @@ impl CurrentDepGraph {
pub struct RegularOpenTask {
node: DepNode,
reads: Vec<DepNodeIndex>,
reads: SmallVec<[DepNodeIndex; 8]>,
read_set: FxHashSet<DepNodeIndex>,
}
pub struct AnonOpenTask {
reads: Vec<DepNodeIndex>,
reads: SmallVec<[DepNodeIndex; 8]>,
read_set: FxHashSet<DepNodeIndex>,
}