From: Matt Corallo Date: Tue, 27 Jul 2021 20:41:24 +0000 (+0000) Subject: Parallelize rolling filter checks/updates, reduce hashes X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=5767a129c52ab94c8b23291a0ce0dda46927eb95;p=dnsseed-rust Parallelize rolling filter checks/updates, reduce hashes --- diff --git a/src/bloom.rs b/src/bloom.rs index 66a40a6..cfd9cda 100644 --- a/src/bloom.rs +++ b/src/bloom.rs @@ -2,12 +2,13 @@ use std::collections::hash_map::RandomState; use std::hash::{BuildHasher, Hash, Hasher}; use std::time::{Duration, Instant}; use std::marker::PhantomData; +use std::sync::RwLock; -// Constants for roughly 1 in 1 million fp with 18m entries +// Constants for roughly 1 in 250k fp with 20m entries /// Number of entries in the filter (each 4 bits). 256MiB in total. const FILTER_SIZE: usize = 64 * 1024 * 1024 * 8; -const HASHES: usize = 27; -const ROLL_COUNT: usize = 1_240_000; +const HASHES: usize = 18; +const ROLL_COUNT: usize = 1_370_000; #[cfg(test)] const GENERATION_BITS: usize = 2; #[cfg(not(test))] @@ -15,12 +16,16 @@ const GENERATION_BITS: usize = 4; pub const GENERATION_COUNT: usize = (1 << GENERATION_BITS) - 1; const ELEMENTS_PER_VAR: usize = 64 / GENERATION_BITS; -pub struct RollingBloomFilter { +struct FilterState { last_roll: Instant, inserted_in_last_generations: [usize; GENERATION_COUNT - 1], inserted_since_last_roll: usize, current_generation: u8, bits: Vec, +} + +pub struct RollingBloomFilter { + state: RwLock, hash_keys: [RandomState; HASHES], _entry_type: PhantomData, } @@ -30,28 +35,34 @@ impl RollingBloomFilter { let mut bits = Vec::new(); bits.resize(FILTER_SIZE * GENERATION_BITS / 64, 0); Self { - last_roll: Instant::now(), - inserted_since_last_roll: 0, - inserted_in_last_generations: [0; GENERATION_COUNT - 1], - current_generation: 1, - bits, + state: RwLock::new(FilterState { + last_roll: Instant::now(), + inserted_since_last_roll: 0, + inserted_in_last_generations: [0; GENERATION_COUNT - 1], + current_generation: 1, + bits, + }), hash_keys: [RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), - RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), - RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), RandomState::new(), - RandomState::new(), RandomState::new()], + RandomState::new(), RandomState::new(), RandomState::new()], _entry_type: PhantomData, } } pub fn contains(&self, item: &T) -> bool { - for state in self.hash_keys.iter() { + let mut hashes = [None; HASHES]; + for (idx, state) in self.hash_keys.iter().enumerate() { let mut hasher = state.build_hasher(); item.hash(&mut hasher); - let idx = hasher.finish() as usize; + hashes[idx] = Some(hasher.finish() as usize); + } - let byte = self.bits[(idx / ELEMENTS_PER_VAR) % (FILTER_SIZE / 64)]; + let state = self.state.read().unwrap(); + for idx_opt in hashes.iter() { + let idx = idx_opt.unwrap(); + + let byte = state.bits[(idx / ELEMENTS_PER_VAR) % (FILTER_SIZE / 64)]; let bits_shift = (idx % ELEMENTS_PER_VAR) * GENERATION_BITS; let bits = (byte & ((GENERATION_COUNT as u64) << bits_shift)) >> bits_shift; if bits == 0 { return false; } @@ -61,20 +72,29 @@ impl RollingBloomFilter { pub fn get_element_count(&self) -> [usize; GENERATION_COUNT] { let mut res = [0; GENERATION_COUNT]; - res[0..(GENERATION_COUNT-1)].copy_from_slice(&self.inserted_in_last_generations); - *res.last_mut().unwrap() = self.inserted_since_last_roll; + let state = self.state.read().unwrap(); + res[0..(GENERATION_COUNT-1)].copy_from_slice(&state.inserted_in_last_generations); + *res.last_mut().unwrap() = state.inserted_since_last_roll; res } - pub fn insert(&mut self, item: &T, roll_duration: Duration) { - if Instant::now() - self.last_roll > roll_duration / GENERATION_COUNT as u32 || - self.inserted_since_last_roll > ROLL_COUNT { - self.current_generation += 1; - if self.current_generation == GENERATION_COUNT as u8 + 1 { self.current_generation = 1; } - let remove_generation = self.current_generation; + pub fn insert(&self, item: &T, roll_duration: Duration) { + let mut hashes = [None; HASHES]; + for (idx, state) in self.hash_keys.iter().enumerate() { + let mut hasher = state.build_hasher(); + item.hash(&mut hasher); + hashes[idx] = Some(hasher.finish() as usize); + } + + let mut state = self.state.write().unwrap(); + if Instant::now() - state.last_roll > roll_duration / GENERATION_COUNT as u32 || + state.inserted_since_last_roll > ROLL_COUNT { + state.current_generation += 1; + if state.current_generation == GENERATION_COUNT as u8 + 1 { state.current_generation = 1; } + let remove_generation = state.current_generation; for idx in 0..(FILTER_SIZE / ELEMENTS_PER_VAR) { - let mut var = self.bits[idx]; + let mut var = state.bits[idx]; for i in 0..ELEMENTS_PER_VAR { let bits_shift = i * GENERATION_BITS; let bits = (var & ((GENERATION_COUNT as u64) << bits_shift)) >> bits_shift; @@ -83,33 +103,32 @@ impl RollingBloomFilter { var &= !((GENERATION_COUNT as u64) << bits_shift); } } - self.bits[idx] = var; + state.bits[idx] = var; } - self.last_roll = Instant::now(); + state.last_roll = Instant::now(); let mut new_generations = [0; GENERATION_COUNT - 1]; - new_generations[0..GENERATION_COUNT - 2].copy_from_slice(&self.inserted_in_last_generations[1..]); - new_generations[GENERATION_COUNT - 2] = self.inserted_since_last_roll; - self.inserted_in_last_generations = new_generations; - self.inserted_since_last_roll = 0; + new_generations[0..GENERATION_COUNT - 2].copy_from_slice(&state.inserted_in_last_generations[1..]); + new_generations[GENERATION_COUNT - 2] = state.inserted_since_last_roll; + state.inserted_in_last_generations = new_generations; + state.inserted_since_last_roll = 0; } - for state in self.hash_keys.iter() { - let mut hasher = state.build_hasher(); - item.hash(&mut hasher); - let idx = hasher.finish() as usize; + let generation = state.current_generation; + for idx_opt in hashes.iter() { + let idx = idx_opt.unwrap(); - let byte = &mut self.bits[(idx / ELEMENTS_PER_VAR) % (FILTER_SIZE / 64)]; + let byte = &mut state.bits[(idx / ELEMENTS_PER_VAR) % (FILTER_SIZE / 64)]; let bits_shift = (idx % ELEMENTS_PER_VAR) * GENERATION_BITS; *byte &= !((GENERATION_COUNT as u64) << bits_shift); - *byte |= (self.current_generation as u64) << bits_shift; + *byte |= (generation as u64) << bits_shift; } - self.inserted_since_last_roll += 1; + state.inserted_since_last_roll += 1; } } #[test] fn test_bloom() { - let mut filter = RollingBloomFilter::new(); + let filter = RollingBloomFilter::new(); for i in 0..1000 { filter.insert(&i, Duration::from_secs(60 * 60 * 24)); } @@ -120,13 +139,13 @@ fn test_bloom() { assert!(!filter.contains(&i)); } assert_eq!(filter.get_element_count(), [0, 0, 1000]); - filter.inserted_since_last_roll = ROLL_COUNT + 1; + filter.state.write().unwrap().inserted_since_last_roll = ROLL_COUNT + 1; filter.insert(&1000, Duration::from_secs(60 * 60 * 24)); assert_eq!(filter.get_element_count(), [0, ROLL_COUNT + 1, 1]); for i in 0..1001 { assert!(filter.contains(&i)); } - filter.inserted_since_last_roll = ROLL_COUNT + 1; + filter.state.write().unwrap().inserted_since_last_roll = ROLL_COUNT + 1; for i in 1001..2000 { filter.insert(&i, Duration::from_secs(60 * 60 * 24)); } @@ -134,7 +153,7 @@ fn test_bloom() { for i in 0..2000 { assert!(filter.contains(&i)); } - filter.inserted_since_last_roll = ROLL_COUNT + 1; + filter.state.write().unwrap().inserted_since_last_roll = ROLL_COUNT + 1; filter.insert(&2000, Duration::from_secs(60 * 60 * 24)); assert_eq!(filter.get_element_count(), [ROLL_COUNT + 1, ROLL_COUNT + 1, 1]); for i in 0..1000 { diff --git a/src/datastore.rs b/src/datastore.rs index b4c40fd..a078f49 100644 --- a/src/datastore.rs +++ b/src/datastore.rs @@ -204,13 +204,11 @@ impl SockAddr { struct Nodes { good_node_services: [HashSet; 64], nodes_to_state: HashMap, - timeout_nodes: RollingBloomFilter, state_next_scan: [Vec; AddressState::get_count() as usize], } struct NodesMutRef<'a> { good_node_services: &'a mut [HashSet; 64], nodes_to_state: &'a mut HashMap, - timeout_nodes: &'a mut RollingBloomFilter, state_next_scan: &'a mut [Vec; AddressState::get_count() as usize], } @@ -219,7 +217,6 @@ impl Nodes { NodesMutRef { good_node_services: &mut self.good_node_services, nodes_to_state: &mut self.nodes_to_state, - timeout_nodes: &mut self.timeout_nodes, state_next_scan: &mut self.state_next_scan, } } @@ -229,6 +226,7 @@ pub struct Store { u64_settings: RwLock>, subver_regex: RwLock>, nodes: RwLock, + timeout_nodes: RollingBloomFilter, start_time: Instant, store: String, } @@ -301,7 +299,6 @@ impl Store { Nodes { good_node_services, nodes_to_state: HashMap::new(), - timeout_nodes: RollingBloomFilter::new(), state_next_scan: state_vecs, } } } @@ -358,6 +355,7 @@ impl Store { u64_settings: RwLock::new(u64_settings), subver_regex: RwLock::new(Arc::new(regex)), nodes: RwLock::new(nodes), + timeout_nodes: RollingBloomFilter::new(), store, start_time: Instant::now(), }) @@ -376,7 +374,7 @@ impl Store { self.nodes.read().unwrap().state_next_scan[state.to_num() as usize].len() } pub fn get_bloom_node_count(&self) -> [usize; crate::bloom::GENERATION_COUNT] { - self.nodes.read().unwrap().timeout_nodes.get_element_count() + self.timeout_nodes.get_element_count() } pub fn get_regex(&self, _setting: RegexSetting) -> Arc { @@ -429,6 +427,10 @@ impl Store { pub fn set_node_state(&self, sockaddr: SocketAddr, state: AddressState, services: u64) -> AddressState { let addr: SockAddr = sockaddr.into(); + if state == AddressState::Untested && self.timeout_nodes.contains(&addr) { + return AddressState::Timeout; + } + let now = (Instant::now() - self.start_time).as_secs().try_into().unwrap(); let mut nodes_lock = self.nodes.write().unwrap(); @@ -441,16 +443,13 @@ impl Store { entry.get().last_services() == 0 && state == AddressState::Timeout => { entry.remove_entry(); - nodes.timeout_nodes.insert(&addr, Duration::from_secs(self.get_u64(U64Setting::RescanInterval(AddressState::Timeout)))); + self.timeout_nodes.insert(&addr, Duration::from_secs(self.get_u64(U64Setting::RescanInterval(AddressState::Timeout)))); return AddressState::Untested; }, hash_map::Entry::Vacant(_) if state == AddressState::Timeout => { - nodes.timeout_nodes.insert(&addr, Duration::from_secs(self.get_u64(U64Setting::RescanInterval(AddressState::Timeout)))); + self.timeout_nodes.insert(&addr, Duration::from_secs(self.get_u64(U64Setting::RescanInterval(AddressState::Timeout)))); return AddressState::Untested; }, - hash_map::Entry::Vacant(_) if nodes.timeout_nodes.contains(&addr) => { - return AddressState::Timeout; - }, _ => {}, }