Patchwork D7116: rust-performance: introduce FastHashMap type alias for HashMap

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Submitter phabricator
Date Oct. 16, 2019, 1:45 p.m.
Message ID <differential-rev-PHID-DREV-4oxudiv4gqabt5hswq6q-req@mercurial-scm.org>
Download mbox | patch
Permalink /patch/42382/
State Superseded
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phabricator - Oct. 16, 2019, 1:45 p.m.
Alphare created this revision.
Herald added subscribers: mercurial-devel, kevincox, durin42.
Herald added a reviewer: hg-reviewers.

REVISION SUMMARY
  Rust's default hashing is slow, because it is meant for preventing collision
  attacks.
  For all of the current Rust code, we don't care about those attacks, because
  if an person with bad intentions has write access to your repo, you have other
  issues.
  
  I've chosen to use the TwoXHash crate because it was made by a reputable member
  of the Rust community and has very good benchmarks.
  
  For now it does not seem to improve performance by much for the current code,
  but it's something else to not worry about when benchmarking code: in a
  previous experiment with copytracing in Rust, it accounted for more than 10%
  of the time of the entire script.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

AFFECTED FILES
  rust/Cargo.lock
  rust/hg-core/Cargo.toml
  rust/hg-core/src/dirstate.rs
  rust/hg-core/src/dirstate/dirs_multiset.rs
  rust/hg-core/src/dirstate/dirstate_map.rs
  rust/hg-core/src/dirstate/parsers.rs
  rust/hg-core/src/filepatterns.rs
  rust/hg-core/src/lib.rs
  rust/hg-cpython/src/parsers.rs

CHANGE DETAILS




To: Alphare, #hg-reviewers
Cc: durin42, kevincox, mercurial-devel
phabricator - Oct. 16, 2019, 8:53 p.m.
durin42 added a comment.


  OOC, have you compared this with the hashbrown crate for perf?

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7116/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

To: Alphare, #hg-reviewers
Cc: durin42, kevincox, mercurial-devel
phabricator - Oct. 16, 2019, 10:59 p.m.
kevincox added a comment.


  In D7116#104617 <https://phab.mercurial-scm.org/D7116#104617>, @durin42 wrote:
  
  > OOC, have you compared this with the hashbrown crate for perf?
  
  std::collections::HashMap now uses hashbrown https://blog.rust-lang.org/2019/07/04/Rust-1.36.0.html

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
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REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

To: Alphare, #hg-reviewers
Cc: durin42, kevincox, mercurial-devel
phabricator - Oct. 16, 2019, 11:03 p.m.
kevincox added a comment.
kevincox accepted this revision.


  I've seen very good results with https://github.com/servo/rust-fnv in the past so it is probably worth including that in the comparison and possibly using it. It is especially good for small keys which seems like a common case in hg.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
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REVISION DETAIL
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To: Alphare, #hg-reviewers, kevincox
Cc: durin42, kevincox, mercurial-devel
phabricator - Oct. 17, 2019, 11:30 p.m.
Alphare added a comment.


  In D7116#104685 <https://phab.mercurial-scm.org/D7116#104685>, @kevincox wrote:
  
  > I've seen very good results with https://github.com/servo/rust-fnv in the past so it is probably worth including that in the comparison and possibly using it. It is especially good for small keys which seems like a common case in hg.
  
  The following comparison shows that for input > 20 bytes, fnv has worse overall performance than xx: https://cglab.ca/~abeinges/blah/hash-rs/.
  I think that keys bigger than 20 bytes are pretty common: `mercurial/dirstate.py` is nested once and is already over 20 bytes. Maybe we could use fnv for cases other than the dirstate where we have mostly small keys, but that seems pretty cumbersome to me.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
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REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

To: Alphare, #hg-reviewers, kevincox
Cc: durin42, kevincox, mercurial-devel
phabricator - Oct. 19, 2019, 12:14 p.m.
kevincox added a comment.


  In D7116#104769 <https://phab.mercurial-scm.org/D7116#104769>, @Alphare wrote:
  
  > The following comparison shows that for input > 20 bytes, fnv has worse overall performance than xx
  
  Sounds good. We can always do benchmarks in the future and swap it.

REPOSITORY
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CHANGES SINCE LAST ACTION
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REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

To: Alphare, #hg-reviewers, kevincox
Cc: durin42, kevincox, mercurial-devel
phabricator - Nov. 8, 2019, 8:49 a.m.
Alphare added a comment.


  I'll rebase this series once my other patches land, to make it easier to get all instances of `HashMap` in the codebase.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
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REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

To: Alphare, #hg-reviewers, kevincox
Cc: durin42, kevincox, mercurial-devel
phabricator - Nov. 11, 2019, 9:18 p.m.
This revision now requires changes to proceed.
durin42 added a comment.
durin42 requested changes to this revision.


  It sounds like I expect this to be rebased now that other patches landed. Let me know if that's wrong?

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
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REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

To: Alphare, #hg-reviewers, kevincox, durin42
Cc: durin42, kevincox, mercurial-devel
phabricator - Dec. 4, 2019, 2:19 p.m.
marmoute added a comment.


  Any update on this ? I'll need it for my work on copy tracing. Reading the review thread, there is no remaining blocker to land this.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7116/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7116

To: Alphare, #hg-reviewers, kevincox, durin42
Cc: marmoute, durin42, kevincox, mercurial-devel

Patch

diff --git a/rust/hg-cpython/src/parsers.rs b/rust/hg-cpython/src/parsers.rs
--- a/rust/hg-cpython/src/parsers.rs
+++ b/rust/hg-cpython/src/parsers.rs
@@ -16,9 +16,9 @@ 
 };
 use hg::{
     pack_dirstate, parse_dirstate, utils::hg_path::HgPathBuf,
-    DirstatePackError, DirstateParents, DirstateParseError, PARENT_SIZE,
+    DirstatePackError, DirstateParents, DirstateParseError, FastHashMap,
+    PARENT_SIZE,
 };
-use std::collections::HashMap;
 use std::convert::TryInto;
 
 use crate::dirstate::{extract_dirstate, make_dirstate_tuple};
@@ -30,8 +30,8 @@ 
     copymap: PyDict,
     st: PyBytes,
 ) -> PyResult<PyTuple> {
-    let mut dirstate_map = HashMap::new();
-    let mut copies = HashMap::new();
+    let mut dirstate_map = FastHashMap::default();
+    let mut copies = FastHashMap::default();
 
     match parse_dirstate(&mut dirstate_map, &mut copies, st.data(py)) {
         Ok(parents) => {
@@ -86,7 +86,7 @@ 
 
     let mut dirstate_map = extract_dirstate(py, &dmap)?;
 
-    let copies: Result<HashMap<HgPathBuf, HgPathBuf>, PyErr> = copymap
+    let copies: Result<FastHashMap<HgPathBuf, HgPathBuf>, PyErr> = copymap
         .items(py)
         .iter()
         .map(|(key, value)| {
diff --git a/rust/hg-core/src/lib.rs b/rust/hg-core/src/lib.rs
--- a/rust/hg-core/src/lib.rs
+++ b/rust/hg-core/src/lib.rs
@@ -22,6 +22,8 @@ 
 pub use filepatterns::{
     build_single_regex, read_pattern_file, PatternSyntax, PatternTuple,
 };
+use std::collections::HashMap;
+use twox_hash::RandomXxHashBuilder64;
 
 /// Mercurial revision numbers
 ///
@@ -51,6 +53,11 @@ 
 
 pub type LineNumber = usize;
 
+/// Rust's default hasher is too slow because it tries to prevent collision
+/// attacks. We are not concerned about those: if an ill-minded person has
+/// write access to your repository, you have other issues.
+pub type FastHashMap<K, V> = HashMap<K, V, RandomXxHashBuilder64>;
+
 #[derive(Clone, Debug, PartialEq)]
 pub enum GraphError {
     ParentOutOfRange(Revision),
diff --git a/rust/hg-core/src/filepatterns.rs b/rust/hg-core/src/filepatterns.rs
--- a/rust/hg-core/src/filepatterns.rs
+++ b/rust/hg-core/src/filepatterns.rs
@@ -7,10 +7,11 @@ 
 
 //! Handling of Mercurial-specific patterns.
 
-use crate::{utils::SliceExt, LineNumber, PatternError, PatternFileError};
+use crate::{
+    utils::SliceExt, FastHashMap, LineNumber, PatternError, PatternFileError,
+};
 use lazy_static::lazy_static;
 use regex::bytes::{NoExpand, Regex};
-use std::collections::HashMap;
 use std::fs::File;
 use std::io::Read;
 use std::path::{Path, PathBuf};
@@ -214,8 +215,8 @@ 
 }
 
 lazy_static! {
-    static ref SYNTAXES: HashMap<&'static [u8], &'static [u8]> = {
-        let mut m = HashMap::new();
+    static ref SYNTAXES: FastHashMap<&'static [u8], &'static [u8]> = {
+        let mut m = FastHashMap::default();
 
         m.insert(b"re".as_ref(), b"relre:".as_ref());
         m.insert(b"regexp".as_ref(), b"relre:".as_ref());
diff --git a/rust/hg-core/src/dirstate/parsers.rs b/rust/hg-core/src/dirstate/parsers.rs
--- a/rust/hg-core/src/dirstate/parsers.rs
+++ b/rust/hg-core/src/dirstate/parsers.rs
@@ -157,13 +157,12 @@ 
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::utils::hg_path::HgPathBuf;
-    use std::collections::HashMap;
+    use crate::{utils::hg_path::HgPathBuf, FastHashMap};
 
     #[test]
     fn test_pack_dirstate_empty() {
-        let mut state_map: StateMap = HashMap::new();
-        let copymap = HashMap::new();
+        let mut state_map: StateMap = FastHashMap::default();
+        let copymap = FastHashMap::default();
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
@@ -194,7 +193,7 @@ 
         .collect();
         let mut state_map = expected_state_map.clone();
 
-        let copymap = HashMap::new();
+        let copymap = FastHashMap::default();
         let parents = DirstateParents {
             p1: *b"12345678910111213141",
             p2: *b"00000000000000000000",
@@ -230,7 +229,7 @@ 
         .cloned()
         .collect();
         let mut state_map = expected_state_map.clone();
-        let mut copymap = HashMap::new();
+        let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
@@ -270,7 +269,7 @@ 
         .iter()
         .cloned()
         .collect();
-        let mut copymap = HashMap::new();
+        let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
@@ -284,8 +283,8 @@ 
             pack_dirstate(&mut state_map, &copymap, parents.clone(), now)
                 .unwrap();
 
-        let mut new_state_map: StateMap = HashMap::new();
-        let mut new_copy_map: CopyMap = HashMap::new();
+        let mut new_state_map: StateMap = FastHashMap::default();
+        let mut new_copy_map: CopyMap = FastHashMap::default();
         let new_parents = parse_dirstate(
             &mut new_state_map,
             &mut new_copy_map,
@@ -341,7 +340,7 @@ 
         .iter()
         .cloned()
         .collect();
-        let mut copymap = HashMap::new();
+        let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
@@ -359,8 +358,8 @@ 
             pack_dirstate(&mut state_map, &copymap, parents.clone(), now)
                 .unwrap();
 
-        let mut new_state_map: StateMap = HashMap::new();
-        let mut new_copy_map: CopyMap = HashMap::new();
+        let mut new_state_map: StateMap = FastHashMap::default();
+        let mut new_copy_map: CopyMap = FastHashMap::default();
         let new_parents = parse_dirstate(
             &mut new_state_map,
             &mut new_copy_map,
@@ -388,7 +387,7 @@ 
         .iter()
         .cloned()
         .collect();
-        let mut copymap = HashMap::new();
+        let mut copymap = FastHashMap::default();
         copymap.insert(
             HgPathBuf::from_bytes(b"f1"),
             HgPathBuf::from_bytes(b"copyname"),
@@ -402,8 +401,8 @@ 
             pack_dirstate(&mut state_map, &copymap, parents.clone(), now)
                 .unwrap();
 
-        let mut new_state_map: StateMap = HashMap::new();
-        let mut new_copy_map: CopyMap = HashMap::new();
+        let mut new_state_map: StateMap = FastHashMap::default();
+        let mut new_copy_map: CopyMap = FastHashMap::default();
         let new_parents = parse_dirstate(
             &mut new_state_map,
             &mut new_copy_map,
diff --git a/rust/hg-core/src/dirstate/dirstate_map.rs b/rust/hg-core/src/dirstate/dirstate_map.rs
--- a/rust/hg-core/src/dirstate/dirstate_map.rs
+++ b/rust/hg-core/src/dirstate/dirstate_map.rs
@@ -11,16 +11,16 @@ 
     pack_dirstate, parse_dirstate,
     utils::files::normalize_case,
     CopyMap, DirsMultiset, DirstateEntry, DirstateError, DirstateMapError,
-    DirstateParents, DirstateParseError, StateMap,
+    DirstateParents, DirstateParseError, FastHashMap, StateMap,
 };
 use core::borrow::Borrow;
-use std::collections::{HashMap, HashSet};
+use std::collections::HashSet;
 use std::convert::TryInto;
 use std::iter::FromIterator;
 use std::ops::Deref;
 use std::time::Duration;
 
-pub type FileFoldMap = HashMap<HgPathBuf, HgPathBuf>;
+pub type FileFoldMap = FastHashMap<HgPathBuf, HgPathBuf>;
 
 const NULL_ID: [u8; 20] = [0; 20];
 const MTIME_UNSET: i32 = -1;
@@ -324,7 +324,7 @@ 
         if let Some(ref file_fold_map) = self.file_fold_map {
             return file_fold_map;
         }
-        let mut new_file_fold_map = FileFoldMap::new();
+        let mut new_file_fold_map = FileFoldMap::default();
         for (filename, DirstateEntry { state, .. }) in self.state_map.borrow()
         {
             if *state == EntryState::Removed {
diff --git a/rust/hg-core/src/dirstate/dirs_multiset.rs b/rust/hg-core/src/dirstate/dirs_multiset.rs
--- a/rust/hg-core/src/dirstate/dirs_multiset.rs
+++ b/rust/hg-core/src/dirstate/dirs_multiset.rs
@@ -11,16 +11,16 @@ 
 use crate::utils::hg_path::{HgPath, HgPathBuf};
 use crate::{
     dirstate::EntryState, utils::files, DirstateEntry, DirstateMapError,
+    FastHashMap,
 };
 use std::collections::hash_map::{self, Entry};
-use std::collections::HashMap;
 
 // could be encapsulated if we care API stability more seriously
 pub type DirsMultisetIter<'a> = hash_map::Keys<'a, HgPathBuf, u32>;
 
 #[derive(PartialEq, Debug)]
 pub struct DirsMultiset {
-    inner: HashMap<HgPathBuf, u32>,
+    inner: FastHashMap<HgPathBuf, u32>,
 }
 
 impl DirsMultiset {
@@ -28,11 +28,11 @@ 
     ///
     /// If `skip_state` is provided, skips dirstate entries with equal state.
     pub fn from_dirstate(
-        vec: &HashMap<HgPathBuf, DirstateEntry>,
+        vec: &FastHashMap<HgPathBuf, DirstateEntry>,
         skip_state: Option<EntryState>,
     ) -> Self {
         let mut multiset = DirsMultiset {
-            inner: HashMap::new(),
+            inner: FastHashMap::default(),
         };
 
         for (filename, DirstateEntry { state, .. }) in vec {
@@ -52,7 +52,7 @@ 
     /// Initializes the multiset from a manifest.
     pub fn from_manifest(vec: &Vec<HgPathBuf>) -> Self {
         let mut multiset = DirsMultiset {
-            inner: HashMap::new(),
+            inner: FastHashMap::default(),
         };
 
         for filename in vec {
@@ -121,7 +121,6 @@ 
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::collections::HashMap;
 
     #[test]
     fn test_delete_path_path_not_found() {
@@ -237,13 +236,13 @@ 
     fn test_dirsmultiset_new_empty() {
         let new = DirsMultiset::from_manifest(&vec![]);
         let expected = DirsMultiset {
-            inner: HashMap::new(),
+            inner: FastHashMap::default(),
         };
         assert_eq!(expected, new);
 
-        let new = DirsMultiset::from_dirstate(&HashMap::new(), None);
+        let new = DirsMultiset::from_dirstate(&FastHashMap::default(), None);
         let expected = DirsMultiset {
-            inner: HashMap::new(),
+            inner: FastHashMap::default(),
         };
         assert_eq!(expected, new);
     }
diff --git a/rust/hg-core/src/dirstate.rs b/rust/hg-core/src/dirstate.rs
--- a/rust/hg-core/src/dirstate.rs
+++ b/rust/hg-core/src/dirstate.rs
@@ -5,9 +5,8 @@ 
 // This software may be used and distributed according to the terms of the
 // GNU General Public License version 2 or any later version.
 
-use crate::{utils::hg_path::HgPathBuf, DirstateParseError};
+use crate::{utils::hg_path::HgPathBuf, DirstateParseError, FastHashMap};
 use std::collections::hash_map;
-use std::collections::HashMap;
 use std::convert::TryFrom;
 
 pub mod dirs_multiset;
@@ -31,9 +30,9 @@ 
     pub size: i32,
 }
 
-pub type StateMap = HashMap<HgPathBuf, DirstateEntry>;
+pub type StateMap = FastHashMap<HgPathBuf, DirstateEntry>;
 pub type StateMapIter<'a> = hash_map::Iter<'a, HgPathBuf, DirstateEntry>;
-pub type CopyMap = HashMap<HgPathBuf, HgPathBuf>;
+pub type CopyMap = FastHashMap<HgPathBuf, HgPathBuf>;
 pub type CopyMapIter<'a> = hash_map::Iter<'a, HgPathBuf, HgPathBuf>;
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
diff --git a/rust/hg-core/Cargo.toml b/rust/hg-core/Cargo.toml
--- a/rust/hg-core/Cargo.toml
+++ b/rust/hg-core/Cargo.toml
@@ -14,4 +14,6 @@ 
 memchr = "2.2.0"
 rand = "0.6.5"
 rand_pcg = "0.1.1"
+rayon = "1.2.0"
 regex = "1.1.0"
+twox-hash = "1.5.0"
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -2,25 +2,47 @@ 
 # It is not intended for manual editing.
 [[package]]
 name = "aho-corasick"
-version = "0.6.9"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "arrayvec"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "autocfg"
-version = "0.1.2"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitflags"
-version = "1.0.4"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "byteorder"
-version = "1.3.1"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "c2-chacha"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ppv-lite86 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -28,7 +50,7 @@ 
 version = "0.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -36,27 +58,83 @@ 
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "python27-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "python3-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "crossbeam-deque"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-queue"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "either"
+version = "1.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "fuchsia-cprng"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "getrandom"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "hg-core"
 version = "0.1.0"
 dependencies = [
- "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "twox-hash 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -65,7 +143,7 @@ 
 dependencies = [
  "cpython 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hg-core 0.1.0",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -73,27 +151,56 @@ 
 version = "0.1.0"
 dependencies = [
  "hg-core 0.1.0",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "lazy_static"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.45"
+version = "0.2.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "memchr"
-version = "2.2.0"
+version = "2.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "memoffset"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "nodrop"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "num-traits"
-version = "0.2.6"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num_cpus"
+version = "1.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -101,8 +208,8 @@ 
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -110,8 +217,8 @@ 
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- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -119,17 +226,29 @@ 
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 dependencies = [
- "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_jitter 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_os 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_jitter 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -137,24 +256,41 @@ 
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
+name = "rand_chacha"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "c2-chacha 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand_core"
-version = "0.4.0"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "rand_core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "rand_hc"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -163,6 +299,14 @@ 
 ]
 
 [[package]]
+name = "rand_hc"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "rand_isaac"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -172,34 +316,34 @@ 
 
 [[package]]
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-version = "0.1.2"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
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-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.64 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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-version = "0.1.1"
+version = "0.1.2"
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 dependencies = [
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- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -211,6 +355,28 @@ 
 ]
 
 [[package]]
+name = "rayon"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-deque 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon-core 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
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+
+[[package]]
+name = "rayon-core"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "crossbeam-queue 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -220,23 +386,19 @@ 
 
 [[package]]
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-version = "1.1.0"
+version = "1.3.1"
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- "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
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- "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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-version = "0.6.4"
+version = "0.6.12"
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-dependencies = [
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-]
 
 [[package]]
 name = "rustc_version"
@@ -247,6 +409,11 @@ 
 ]
 
 [[package]]
+name = "scopeguard"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
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@@ -264,22 +431,25 @@ 
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "ucd-util"
-version = "0.1.3"
+name = "twox-hash"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
-name = "utf8-ranges"
-version = "1.0.2"
+name = "wasi"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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-version = "0.3.6"
+version = "0.3.8"
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 dependencies = [
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@@ -297,38 +467,58 @@ 
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