D5417: rust: translated random test of missingancestors
gracinet (Georges Racinet)
phabricator at mercurial-scm.org
Wed Feb 13 07:51:25 EST 2019
This revision was automatically updated to reflect the committed changes.
Closed by commit rHG9370f4843084: rust: translated random test of missingancestors (authored by gracinet, committed by ).
REPOSITORY
rHG Mercurial
CHANGES SINCE LAST UPDATE
https://phab.mercurial-scm.org/D5417?vs=14044&id=14067
REVISION DETAIL
https://phab.mercurial-scm.org/D5417
AFFECTED FILES
rust/Cargo.lock
rust/hg-core/Cargo.toml
rust/hg-core/src/lib.rs
rust/hg-core/tests/test_missing_ancestors.rs
CHANGE DETAILS
diff --git a/rust/hg-core/tests/test_missing_ancestors.rs b/rust/hg-core/tests/test_missing_ancestors.rs
new file mode 100644
--- /dev/null
+++ b/rust/hg-core/tests/test_missing_ancestors.rs
@@ -0,0 +1,340 @@
+extern crate hg;
+extern crate rand;
+extern crate rand_pcg;
+
+use hg::testing::VecGraph;
+use hg::Revision;
+use hg::*;
+use rand::distributions::{Distribution, LogNormal, Uniform};
+use rand::{thread_rng, Rng, RngCore, SeedableRng};
+use std::cmp::min;
+use std::collections::HashSet;
+use std::env;
+use std::fmt::Debug;
+
+fn build_random_graph(
+ nodes_opt: Option<usize>,
+ rootprob_opt: Option<f64>,
+ mergeprob_opt: Option<f64>,
+ prevprob_opt: Option<f64>,
+) -> VecGraph {
+ let nodes = nodes_opt.unwrap_or(100);
+ let rootprob = rootprob_opt.unwrap_or(0.05);
+ let mergeprob = mergeprob_opt.unwrap_or(0.2);
+ let prevprob = prevprob_opt.unwrap_or(0.7);
+
+ let mut rng = thread_rng();
+ let mut vg: VecGraph = Vec::with_capacity(nodes);
+ for i in 0..nodes {
+ if i == 0 || rng.gen_bool(rootprob) {
+ vg.push([NULL_REVISION, NULL_REVISION])
+ } else if i == 1 {
+ vg.push([0, NULL_REVISION])
+ } else if rng.gen_bool(mergeprob) {
+ let p1 = {
+ if i == 2 || rng.gen_bool(prevprob) {
+ (i - 1) as Revision
+ } else {
+ rng.gen_range(0, i - 1) as Revision
+ }
+ };
+ // p2 is a random revision lower than i and different from p1
+ let mut p2 = rng.gen_range(0, i - 1) as Revision;
+ if p2 >= p1 {
+ p2 = p2 + 1;
+ }
+ vg.push([p1, p2]);
+ } else if rng.gen_bool(prevprob) {
+ vg.push([(i - 1) as Revision, NULL_REVISION])
+ } else {
+ vg.push([rng.gen_range(0, i - 1) as Revision, NULL_REVISION])
+ }
+ }
+ vg
+}
+
+/// Compute the ancestors set of all revisions of a VecGraph
+fn ancestors_sets(vg: &VecGraph) -> Vec<HashSet<Revision>> {
+ let mut ancs: Vec<HashSet<Revision>> = Vec::new();
+ for i in 0..vg.len() {
+ let mut ancs_i = HashSet::new();
+ ancs_i.insert(i as Revision);
+ for p in vg[i].iter().cloned() {
+ if p != NULL_REVISION {
+ ancs_i.extend(&ancs[p as usize]);
+ }
+ }
+ ancs.push(ancs_i);
+ }
+ ancs
+}
+
+#[derive(Clone, Debug)]
+enum MissingAncestorsAction {
+ InitialBases(HashSet<Revision>),
+ AddBases(HashSet<Revision>),
+ RemoveAncestorsFrom(HashSet<Revision>),
+ MissingAncestors(HashSet<Revision>),
+}
+
+/// An instrumented naive yet obviously correct implementation
+///
+/// It also records all its actions for easy reproduction for replay
+/// of problematic cases
+struct NaiveMissingAncestors<'a> {
+ ancestors_sets: &'a Vec<HashSet<Revision>>,
+ graph: &'a VecGraph, // used for error reporting only
+ bases: HashSet<Revision>,
+ history: Vec<MissingAncestorsAction>,
+ // for error reporting, assuming we are in a random test
+ random_seed: String,
+}
+
+impl<'a> NaiveMissingAncestors<'a> {
+ fn new(
+ graph: &'a VecGraph,
+ ancestors_sets: &'a Vec<HashSet<Revision>>,
+ bases: &HashSet<Revision>,
+ random_seed: &str,
+ ) -> Self {
+ Self {
+ ancestors_sets: ancestors_sets,
+ bases: bases.clone(),
+ graph: graph,
+ history: vec![MissingAncestorsAction::InitialBases(bases.clone())],
+ random_seed: random_seed.into(),
+ }
+ }
+
+ fn add_bases(&mut self, new_bases: HashSet<Revision>) {
+ self.bases.extend(&new_bases);
+ self.history
+ .push(MissingAncestorsAction::AddBases(new_bases))
+ }
+
+ fn remove_ancestors_from(&mut self, revs: &mut HashSet<Revision>) {
+ revs.remove(&NULL_REVISION);
+ self.history
+ .push(MissingAncestorsAction::RemoveAncestorsFrom(revs.clone()));
+ for base in self.bases.iter().cloned() {
+ if base != NULL_REVISION {
+ for rev in &self.ancestors_sets[base as usize] {
+ revs.remove(&rev);
+ }
+ }
+ }
+ }
+
+ fn missing_ancestors(
+ &mut self,
+ revs: impl IntoIterator<Item = Revision>,
+ ) -> Vec<Revision> {
+ let revs_as_set: HashSet<Revision> = revs.into_iter().collect();
+
+ let mut missing: HashSet<Revision> = HashSet::new();
+ for rev in revs_as_set.iter().cloned() {
+ if rev != NULL_REVISION {
+ missing.extend(&self.ancestors_sets[rev as usize])
+ }
+ }
+ self.history
+ .push(MissingAncestorsAction::MissingAncestors(revs_as_set));
+
+ for base in self.bases.iter().cloned() {
+ if base != NULL_REVISION {
+ for rev in &self.ancestors_sets[base as usize] {
+ missing.remove(&rev);
+ }
+ }
+ }
+ let mut res: Vec<Revision> = missing.iter().cloned().collect();
+ res.sort();
+ res
+ }
+
+ fn assert_eq<T>(&self, left: T, right: T)
+ where
+ T: PartialEq + Debug,
+ {
+ if left == right {
+ return;
+ }
+ panic!(format!(
+ "Equality assertion failed (left != right)
+ left={:?}
+ right={:?}
+ graph={:?}
+ current bases={:?}
+ history={:?}
+ random seed={}
+ ",
+ left,
+ right,
+ self.graph,
+ self.bases,
+ self.history,
+ self.random_seed,
+ ));
+ }
+}
+
+/// Choose a set of random revisions
+///
+/// The size of the set is taken from a LogNormal distribution
+/// with default mu=1.1 and default sigma=0.8. Quoting the Python
+/// test this is taken from:
+/// the default mu and sigma give us a nice distribution of mostly
+/// single-digit counts (including 0) with some higher ones
+/// The sample may include NULL_REVISION
+fn sample_revs<R: RngCore>(
+ rng: &mut R,
+ maxrev: Revision,
+ mu_opt: Option<f64>,
+ sigma_opt: Option<f64>,
+) -> HashSet<Revision> {
+ let mu = mu_opt.unwrap_or(1.1);
+ let sigma = sigma_opt.unwrap_or(0.8);
+
+ let log_normal = LogNormal::new(mu, sigma);
+ let nb = min(maxrev as usize, log_normal.sample(rng).floor() as usize);
+
+ let dist = Uniform::from(NULL_REVISION..maxrev);
+ return rng.sample_iter(&dist).take(nb).collect();
+}
+
+/// Produces the hexadecimal representation of a slice of bytes
+fn hex_bytes(bytes: &[u8]) -> String {
+ let mut s = String::with_capacity(bytes.len() * 2);
+ for b in bytes {
+ s.push_str(&format!("{:x}", b));
+ }
+ s
+}
+
+/// Fill a random seed from its hexadecimal representation.
+///
+/// This signature is meant to be consistent with `RngCore::fill_bytes`
+fn seed_parse_in(hex: &str, seed: &mut [u8]) {
+ if hex.len() != 32 {
+ panic!("Seed {} is too short for 128 bits hex", hex);
+ }
+ for i in 0..8 {
+ seed[i] = u8::from_str_radix(&hex[2 * i..2 * (i + 1)], 16)
+ .unwrap_or_else(|_e| panic!("Seed {} is not 128 bits hex", hex));
+ }
+}
+
+/// Parse the parameters for `test_missing_ancestors()`
+///
+/// Returns (graphs, instances, calls per instance)
+fn parse_test_missing_ancestors_params(var: &str) -> (usize, usize, usize) {
+ let err_msg = "TEST_MISSING_ANCESTORS format: GRAPHS,INSTANCES,CALLS";
+ let params: Vec<usize> = var
+ .split(',')
+ .map(|n| n.trim().parse().expect(err_msg))
+ .collect();
+ if params.len() != 3 {
+ panic!(err_msg);
+ }
+ (params[0], params[1], params[2])
+}
+
+#[test]
+/// This test creates lots of random VecGraphs,
+/// and compare a bunch of MissingAncestors for them with
+/// NaiveMissingAncestors that rely on precomputed transitive closures of
+/// these VecGraphs (ancestors_sets).
+///
+/// For each generater graph, several instances of `MissingAncestors` are
+/// created, whose methods are called and checked a given number of times.
+///
+/// This test can be parametrized by two environment variables:
+///
+/// - TEST_RANDOM_SEED: must be 128 bits in hexadecimal
+/// - TEST_MISSING_ANCESTORS: "GRAPHS,INSTANCES,CALLS". The default is
+/// "100,10,10"
+///
+/// This is slow: it runs on my workstation in about 5 seconds with the
+/// default parameters with a plain `cargo --test`.
+///
+/// If you want to run it faster, especially if you're changing the
+/// parameters, use `cargo test --release`.
+/// For me, that gets it down to 0.15 seconds with the default parameters
+fn test_missing_ancestors_compare_naive() {
+ let (graphcount, testcount, inccount) =
+ match env::var("TEST_MISSING_ANCESTORS") {
+ Err(env::VarError::NotPresent) => (100, 10, 10),
+ Ok(val) => parse_test_missing_ancestors_params(&val),
+ Err(env::VarError::NotUnicode(_)) => {
+ panic!("TEST_MISSING_ANCESTORS is invalid");
+ }
+ };
+ let mut seed: [u8; 16] = [0; 16];
+ match env::var("TEST_RANDOM_SEED") {
+ Ok(val) => {
+ seed_parse_in(&val, &mut seed);
+ }
+ Err(env::VarError::NotPresent) => {
+ thread_rng().fill_bytes(&mut seed);
+ }
+ Err(env::VarError::NotUnicode(_)) => {
+ panic!("TEST_RANDOM_SEED must be 128 bits in hex");
+ }
+ }
+ let hex_seed = hex_bytes(&seed);
+ eprintln!("Random seed: {}", hex_seed);
+
+ let mut rng = rand_pcg::Pcg32::from_seed(seed);
+
+ eprint!("Checking MissingAncestors against brute force implementation ");
+ eprint!("for {} random graphs, ", graphcount);
+ eprintln!(
+ "with {} instances for each and {} calls per instance",
+ testcount, inccount,
+ );
+ for g in 0..graphcount {
+ if g != 0 && g % 100 == 0 {
+ eprintln!("Tested with {} graphs", g);
+ }
+ let graph = build_random_graph(None, None, None, None);
+ let graph_len = graph.len() as Revision;
+ let ancestors_sets = ancestors_sets(&graph);
+ for _testno in 0..testcount {
+ let bases: HashSet<Revision> =
+ sample_revs(&mut rng, graph_len, None, None);
+ let mut inc = MissingAncestors::<VecGraph>::new(
+ graph.clone(),
+ bases.clone(),
+ );
+ let mut naive = NaiveMissingAncestors::new(
+ &graph,
+ &ancestors_sets,
+ &bases,
+ &hex_seed,
+ );
+ for _m in 0..inccount {
+ if rng.gen_bool(0.2) {
+ let new_bases =
+ sample_revs(&mut rng, graph_len, None, None);
+ inc.add_bases(new_bases.iter().cloned());
+ naive.add_bases(new_bases);
+ }
+ if rng.gen_bool(0.4) {
+ // larger set so that there are more revs to remove from
+ let mut hrevs =
+ sample_revs(&mut rng, graph_len, Some(1.5), None);
+ let mut rrevs = hrevs.clone();
+ inc.remove_ancestors_from(&mut hrevs).unwrap();
+ naive.remove_ancestors_from(&mut rrevs);
+ naive.assert_eq(hrevs, rrevs);
+ } else {
+ let revs = sample_revs(&mut rng, graph_len, None, None);
+ let hm =
+ inc.missing_ancestors(revs.iter().cloned()).unwrap();
+ let rm = naive.missing_ancestors(revs.iter().cloned());
+ naive.assert_eq(hm, rm);
+ }
+ }
+ }
+ }
+}
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
@@ -5,8 +5,7 @@
mod ancestors;
pub mod dagops;
pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors};
-#[cfg(test)]
-pub mod testing;
+pub mod testing; // unconditionally built, for use from integration tests
/// Mercurial revision numbers
///
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
@@ -6,3 +6,7 @@
[lib]
name = "hg"
+
+[dev-dependencies]
+rand = "*"
+rand_pcg = "*"
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -7,11 +7,29 @@
]
[[package]]
+name = "autocfg"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "bitflags"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
name = "cfg-if"
version = "0.1.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
+name = "cloudabi"
+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)",
+]
+
+[[package]]
name = "cpython"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -23,8 +41,17 @@
]
[[package]]
+name = "fuchsia-cprng"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
name = "hg-core"
version = "0.1.0"
+dependencies = [
+ "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)",
+]
[[package]]
name = "hg-cpython"
@@ -89,6 +116,110 @@
]
[[package]]
+name = "rand"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+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)",
+ "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_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_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)",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.2 (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_core"
+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)",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.4.0"
+source = "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"
+dependencies = [
+ "rand_core 0.3.1 (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"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_jitter"
+version = "0.1.2"
+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)",
+]
+
+[[package]]
+name = "rand_os"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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)",
+ "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)",
+]
+
+[[package]]
+name = "rand_pcg"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_xorshift"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rdrand"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
name = "regex"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -109,6 +240,27 @@
]
[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
name = "thread_local"
version = "0.3.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -131,19 +283,59 @@
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
+[[package]]
+name = "winapi"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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