47a04244ec
Add four major optimization modules to synor-vm: - scheduler.rs: Sealevel-style parallel execution scheduler with access set declarations, conflict detection, and batch scheduling for 10-100x throughput on non-conflicting transactions - tiered.rs: Multi-tier JIT compilation (Cold/Warm/Hot) with LRU caching and automatic tier promotion based on execution frequency - compression.rs: Bytecode compression using zstd (40-70% size reduction), content-defined chunking for deduplication, and delta encoding for efficient contract upgrades - speculation.rs: Speculative execution engine with hot state caching, version tracking, snapshot/rollback support for 30-70% latency reduction All modules include comprehensive test coverage (57 tests passing).
877 lines
26 KiB
Rust
877 lines
26 KiB
Rust
//! Speculative Execution and Hot State Caching.
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//!
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//! This module provides optimistic transaction execution with rollback support
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//! and intelligent state caching for frequently accessed contracts.
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//!
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//! # Architecture
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//!
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//! ```text
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//! ┌─────────────────────────────────────────────────────────────────┐
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//! │ SPECULATIVE EXECUTION ENGINE │
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//! ├─────────────────────────────────────────────────────────────────┤
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//! │ │
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//! │ ┌──────────────┐ ┌──────────────┐ ┌──────────────────────┐ │
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//! │ │ Pending │ │ Speculative │ │ Hot State │ │
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//! │ │ Pool │──│ Executor │──│ Cache │ │
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//! │ └──────────────┘ └──────────────┘ └──────────────────────┘ │
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//! │ │ │ │ │
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//! │ │ ┌──────▼───────┐ │ │
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//! │ │ │ Version │ │ │
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//! │ └─────────▶│ Manager │◀──────────┘ │
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//! │ └──────────────┘ │
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//! │ │ │
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//! │ ┌──────▼───────┐ │
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//! │ │ Rollback │ │
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//! │ │ Handler │ │
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//! │ └──────────────┘ │
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//! │ │
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//! └─────────────────────────────────────────────────────────────────┘
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//! ```
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//!
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//! # Benefits
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//!
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//! - Pre-execution reduces apparent latency by 30-70%
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//! - Hot state cache eliminates 90%+ of storage reads
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//! - Snapshot/rollback enables safe speculation
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//! - Version tracking prevents dirty reads
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use std::collections::{HashMap, HashSet, VecDeque};
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use std::sync::atomic::{AtomicU64, Ordering};
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use std::sync::Arc;
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use parking_lot::{Mutex, RwLock};
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use crate::{ContractId, ExecutionResult, StorageKey, StorageValue, VmError};
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/// Configuration for speculative execution.
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#[derive(Clone, Debug)]
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pub struct SpeculativeConfig {
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/// Maximum pending speculative executions.
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pub max_pending: usize,
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/// Maximum speculative depth (blocks ahead).
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pub max_depth: u32,
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/// Enable hot state caching.
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pub enable_cache: bool,
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/// Hot cache size per contract.
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pub cache_size_per_contract: usize,
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/// Global cache size limit.
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pub global_cache_limit: usize,
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/// Snapshot retention count.
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pub snapshot_retention: usize,
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/// Auto-promote threshold (access count).
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pub hot_threshold: u32,
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}
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impl Default for SpeculativeConfig {
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fn default() -> Self {
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Self {
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max_pending: 1000,
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max_depth: 3,
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enable_cache: true,
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cache_size_per_contract: 1024,
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global_cache_limit: 100_000,
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snapshot_retention: 10,
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hot_threshold: 5,
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}
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}
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}
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/// Speculative execution state version.
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#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub struct StateVersion(pub u64);
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impl StateVersion {
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/// Creates a new state version.
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pub fn new(version: u64) -> Self {
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Self(version)
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}
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/// Returns the next version.
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pub fn next(&self) -> Self {
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Self(self.0 + 1)
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}
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}
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/// A cached state entry with version tracking.
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#[derive(Clone, Debug)]
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pub struct CachedState {
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/// The cached value.
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pub value: Option<StorageValue>,
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/// Version when cached.
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pub version: StateVersion,
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/// Access count for hot tracking.
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pub access_count: u32,
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/// Last access timestamp (block height).
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pub last_access: u64,
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}
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impl CachedState {
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/// Creates a new cached state.
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pub fn new(value: Option<StorageValue>, version: StateVersion) -> Self {
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Self {
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value,
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version,
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access_count: 1,
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last_access: 0,
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}
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}
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/// Records an access.
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pub fn record_access(&mut self, block_height: u64) {
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self.access_count = self.access_count.saturating_add(1);
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self.last_access = block_height;
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}
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/// Checks if this entry is hot.
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pub fn is_hot(&self, threshold: u32) -> bool {
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self.access_count >= threshold
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}
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}
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/// Hot state cache for a single contract.
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#[derive(Debug)]
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pub struct ContractCache {
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/// Contract identifier.
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pub contract_id: ContractId,
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/// Cached key-value pairs.
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entries: HashMap<StorageKey, CachedState>,
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/// Maximum cache entries.
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max_size: usize,
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/// Cache statistics.
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stats: CacheStats,
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}
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impl ContractCache {
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/// Creates a new contract cache.
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pub fn new(contract_id: ContractId, max_size: usize) -> Self {
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Self {
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contract_id,
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entries: HashMap::new(),
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max_size,
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stats: CacheStats::default(),
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}
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}
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/// Gets a value from cache.
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pub fn get(&mut self, key: &StorageKey, block_height: u64) -> Option<&CachedState> {
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if let Some(entry) = self.entries.get_mut(key) {
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entry.record_access(block_height);
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self.stats.hits += 1;
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Some(entry)
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} else {
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self.stats.misses += 1;
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None
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}
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}
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/// Inserts a value into cache.
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pub fn insert(&mut self, key: StorageKey, value: Option<StorageValue>, version: StateVersion) {
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// Evict if at capacity.
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if self.entries.len() >= self.max_size {
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self.evict_coldest();
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}
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self.entries.insert(key, CachedState::new(value, version));
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self.stats.inserts += 1;
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}
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/// Updates a cached value.
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pub fn update(&mut self, key: &StorageKey, value: Option<StorageValue>, version: StateVersion) {
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if let Some(entry) = self.entries.get_mut(key) {
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entry.value = value;
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entry.version = version;
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self.stats.updates += 1;
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} else {
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self.insert(*key, value, version);
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}
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}
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/// Invalidates entries older than a version.
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pub fn invalidate_older_than(&mut self, version: StateVersion) {
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self.entries.retain(|_, v| v.version >= version);
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self.stats.invalidations += 1;
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}
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/// Evicts the coldest (least accessed) entry.
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fn evict_coldest(&mut self) {
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if let Some(coldest_key) = self
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.entries
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.iter()
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.min_by_key(|(_, v)| v.access_count)
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.map(|(k, _)| *k)
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{
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self.entries.remove(&coldest_key);
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self.stats.evictions += 1;
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}
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}
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/// Returns cache statistics.
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pub fn stats(&self) -> &CacheStats {
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&self.stats
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}
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/// Returns the hit rate.
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pub fn hit_rate(&self) -> f64 {
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let total = self.stats.hits + self.stats.misses;
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if total == 0 {
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0.0
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} else {
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self.stats.hits as f64 / total as f64
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}
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}
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}
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/// Cache statistics.
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#[derive(Clone, Debug, Default)]
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pub struct CacheStats {
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/// Cache hits.
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pub hits: u64,
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/// Cache misses.
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pub misses: u64,
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/// Cache inserts.
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pub inserts: u64,
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/// Cache updates.
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pub updates: u64,
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/// Cache evictions.
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pub evictions: u64,
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/// Cache invalidations.
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pub invalidations: u64,
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}
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/// Global hot state cache manager.
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pub struct HotStateCache {
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/// Configuration.
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config: SpeculativeConfig,
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/// Per-contract caches.
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caches: RwLock<HashMap<ContractId, ContractCache>>,
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/// Current version.
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current_version: AtomicU64,
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/// Global statistics.
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stats: RwLock<GlobalCacheStats>,
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}
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impl HotStateCache {
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/// Creates a new hot state cache.
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pub fn new(config: SpeculativeConfig) -> Self {
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Self {
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config,
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caches: RwLock::new(HashMap::new()),
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current_version: AtomicU64::new(0),
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stats: RwLock::new(GlobalCacheStats::default()),
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}
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}
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/// Gets the current version.
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pub fn version(&self) -> StateVersion {
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StateVersion(self.current_version.load(Ordering::Acquire))
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}
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/// Advances to the next version.
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pub fn advance_version(&self) -> StateVersion {
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let new_version = self.current_version.fetch_add(1, Ordering::AcqRel) + 1;
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StateVersion(new_version)
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}
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/// Gets a value from cache.
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pub fn get(
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&self,
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contract_id: ContractId,
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key: &StorageKey,
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block_height: u64,
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) -> Option<Option<StorageValue>> {
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let mut caches = self.caches.write();
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if let Some(cache) = caches.get_mut(&contract_id) {
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cache.get(key, block_height).map(|s| s.value.clone())
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} else {
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None
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}
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}
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/// Inserts a value into cache.
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pub fn insert(
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&self,
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contract_id: ContractId,
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key: StorageKey,
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value: Option<StorageValue>,
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) {
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let version = self.advance_version();
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let mut caches = self.caches.write();
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// Check global limit.
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let total_entries: usize = caches.values().map(|c| c.entries.len()).sum();
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if total_entries >= self.config.global_cache_limit {
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// Evict from coldest contract.
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self.evict_coldest_contract(&mut caches);
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}
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let cache = caches
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.entry(contract_id)
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.or_insert_with(|| ContractCache::new(contract_id, self.config.cache_size_per_contract));
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cache.insert(key, value, version);
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}
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/// Batch update from execution result.
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pub fn apply_execution_result(
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&self,
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contract_id: ContractId,
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changes: &[(StorageKey, Option<StorageValue>)],
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) {
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let version = self.advance_version();
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let mut caches = self.caches.write();
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let cache = caches
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.entry(contract_id)
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.or_insert_with(|| ContractCache::new(contract_id, self.config.cache_size_per_contract));
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for (key, value) in changes {
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cache.update(key, value.clone(), version);
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}
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}
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/// Invalidates all caches older than a version.
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pub fn invalidate_older_than(&self, version: StateVersion) {
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let mut caches = self.caches.write();
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for cache in caches.values_mut() {
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cache.invalidate_older_than(version);
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}
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}
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/// Evicts entries from the coldest contract.
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fn evict_coldest_contract(&self, caches: &mut HashMap<ContractId, ContractCache>) {
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// Find contract with lowest average hit rate.
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if let Some(coldest_id) = caches
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.iter()
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.min_by(|(_, a), (_, b)| {
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a.hit_rate()
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.partial_cmp(&b.hit_rate())
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.unwrap_or(std::cmp::Ordering::Equal)
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})
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.map(|(id, _)| *id)
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{
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if let Some(cache) = caches.get_mut(&coldest_id) {
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cache.evict_coldest();
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}
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}
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}
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/// Returns global cache statistics.
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pub fn stats(&self) -> GlobalCacheStats {
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let caches = self.caches.read();
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let mut stats = GlobalCacheStats::default();
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for cache in caches.values() {
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let cs = cache.stats();
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stats.total_hits += cs.hits;
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stats.total_misses += cs.misses;
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stats.total_entries += cache.entries.len() as u64;
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}
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stats.contract_count = caches.len() as u64;
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stats
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}
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}
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/// Global cache statistics.
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#[derive(Clone, Debug, Default)]
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pub struct GlobalCacheStats {
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/// Total cache hits.
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pub total_hits: u64,
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/// Total cache misses.
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pub total_misses: u64,
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/// Total cached entries.
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pub total_entries: u64,
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/// Number of cached contracts.
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pub contract_count: u64,
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}
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/// A state snapshot for rollback support.
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#[derive(Clone, Debug)]
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pub struct StateSnapshot {
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/// Snapshot version.
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pub version: StateVersion,
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/// Block height when taken.
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pub block_height: u64,
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/// State changes to rollback.
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pub changes: HashMap<(ContractId, StorageKey), Option<StorageValue>>,
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}
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impl StateSnapshot {
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/// Creates a new snapshot.
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pub fn new(version: StateVersion, block_height: u64) -> Self {
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Self {
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version,
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block_height,
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changes: HashMap::new(),
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}
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}
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/// Records the original value before a change.
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pub fn record_original(
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&mut self,
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contract_id: ContractId,
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key: StorageKey,
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original_value: Option<StorageValue>,
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) {
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// Only record the first original value (don't overwrite).
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self.changes
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.entry((contract_id, key))
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.or_insert(original_value);
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}
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}
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/// Speculative execution result.
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#[derive(Clone, Debug)]
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pub struct SpeculativeResult {
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/// Transaction identifier.
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pub tx_id: [u8; 32],
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/// Execution result.
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pub result: Result<ExecutionResult, VmError>,
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/// State version after execution.
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pub version: StateVersion,
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/// Contracts accessed (read).
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pub reads: HashSet<ContractId>,
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/// Contracts modified (write).
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pub writes: HashSet<ContractId>,
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/// State changes made.
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pub changes: Vec<(ContractId, StorageKey, Option<StorageValue>)>,
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/// Whether this execution can be committed.
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pub committable: bool,
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}
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/// Pending speculative execution.
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#[derive(Debug)]
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pub struct PendingExecution {
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/// Transaction identifier.
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pub tx_id: [u8; 32],
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/// Predicted block height.
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pub predicted_block: u64,
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/// Execution result.
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pub result: SpeculativeResult,
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/// Snapshot for rollback.
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pub snapshot: StateSnapshot,
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}
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/// Speculative executor with rollback support.
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pub struct SpeculativeExecutor {
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/// Configuration.
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config: SpeculativeConfig,
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/// Hot state cache.
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cache: Arc<HotStateCache>,
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/// Pending executions.
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pending: Mutex<VecDeque<PendingExecution>>,
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/// State snapshots.
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snapshots: Mutex<VecDeque<StateSnapshot>>,
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/// Current block height.
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current_block: AtomicU64,
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/// Execution statistics.
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stats: RwLock<SpeculativeStats>,
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}
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impl SpeculativeExecutor {
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/// Creates a new speculative executor.
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pub fn new(config: SpeculativeConfig) -> Self {
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let cache = Arc::new(HotStateCache::new(config.clone()));
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Self {
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config,
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cache,
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pending: Mutex::new(VecDeque::new()),
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snapshots: Mutex::new(VecDeque::new()),
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current_block: AtomicU64::new(0),
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stats: RwLock::new(SpeculativeStats::default()),
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}
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}
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/// Returns the hot state cache.
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pub fn cache(&self) -> Arc<HotStateCache> {
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self.cache.clone()
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}
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/// Sets the current block height.
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pub fn set_block_height(&self, height: u64) {
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self.current_block.store(height, Ordering::Release);
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}
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/// Gets the current block height.
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pub fn block_height(&self) -> u64 {
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self.current_block.load(Ordering::Acquire)
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}
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/// Creates a snapshot for speculative execution.
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pub fn create_snapshot(&self) -> StateSnapshot {
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let version = self.cache.advance_version();
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let block_height = self.block_height();
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let snapshot = StateSnapshot::new(version, block_height);
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let mut snapshots = self.snapshots.lock();
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if snapshots.len() >= self.config.snapshot_retention {
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snapshots.pop_front();
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}
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snapshots.push_back(snapshot.clone());
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snapshot
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}
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/// Submits a transaction for speculative execution.
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pub fn submit_speculative<F>(
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&self,
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tx_id: [u8; 32],
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predicted_block: u64,
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execute_fn: F,
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) -> Result<SpeculativeResult, VmError>
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where
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F: FnOnce() -> Result<(ExecutionResult, SpeculativeContext), VmError>,
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{
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// Check depth limit.
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let current = self.block_height();
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if predicted_block.saturating_sub(current) > self.config.max_depth as u64 {
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return Err(VmError::ExecutionError(
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"Speculative depth exceeded".to_string(),
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));
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}
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// Check pending limit.
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{
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let pending = self.pending.lock();
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if pending.len() >= self.config.max_pending {
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return Err(VmError::ExecutionError(
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"Too many pending speculative executions".to_string(),
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));
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}
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}
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// Create snapshot.
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let snapshot = self.create_snapshot();
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|
|
// Execute speculatively.
|
|
let (result, context) = execute_fn()?;
|
|
|
|
let spec_result = SpeculativeResult {
|
|
tx_id,
|
|
result: Ok(result),
|
|
version: snapshot.version,
|
|
reads: context.reads,
|
|
writes: context.writes,
|
|
changes: context.changes,
|
|
committable: true,
|
|
};
|
|
|
|
// Store pending execution.
|
|
let pending_exec = PendingExecution {
|
|
tx_id,
|
|
predicted_block,
|
|
result: spec_result.clone(),
|
|
snapshot,
|
|
};
|
|
|
|
self.pending.lock().push_back(pending_exec);
|
|
|
|
// Update stats.
|
|
{
|
|
let mut stats = self.stats.write();
|
|
stats.speculative_executions += 1;
|
|
}
|
|
|
|
Ok(spec_result)
|
|
}
|
|
|
|
/// Commits a speculative execution.
|
|
pub fn commit(&self, tx_id: &[u8; 32]) -> Result<(), VmError> {
|
|
let mut pending = self.pending.lock();
|
|
|
|
let idx = pending
|
|
.iter()
|
|
.position(|p| &p.tx_id == tx_id)
|
|
.ok_or_else(|| VmError::ExecutionError("Speculative execution not found".to_string()))?;
|
|
|
|
let exec = pending.remove(idx).unwrap();
|
|
|
|
// Apply changes to cache.
|
|
for (contract_id, key, value) in &exec.result.changes {
|
|
self.cache.insert(*contract_id, *key, value.clone());
|
|
}
|
|
|
|
// Update stats.
|
|
{
|
|
let mut stats = self.stats.write();
|
|
stats.committed += 1;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Rolls back a speculative execution.
|
|
pub fn rollback(&self, tx_id: &[u8; 32]) -> Result<(), VmError> {
|
|
let mut pending = self.pending.lock();
|
|
|
|
let idx = pending
|
|
.iter()
|
|
.position(|p| &p.tx_id == tx_id)
|
|
.ok_or_else(|| VmError::ExecutionError("Speculative execution not found".to_string()))?;
|
|
|
|
let exec = pending.remove(idx).unwrap();
|
|
|
|
// Rollback changes using snapshot.
|
|
for ((contract_id, key), original_value) in exec.snapshot.changes {
|
|
self.cache.insert(contract_id, key, original_value);
|
|
}
|
|
|
|
// Invalidate newer cache entries.
|
|
self.cache.invalidate_older_than(exec.snapshot.version.next());
|
|
|
|
// Update stats.
|
|
{
|
|
let mut stats = self.stats.write();
|
|
stats.rolled_back += 1;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Checks for conflicts with confirmed state.
|
|
pub fn check_conflicts(&self, tx_id: &[u8; 32]) -> bool {
|
|
let pending = self.pending.lock();
|
|
|
|
if let Some(exec) = pending.iter().find(|p| &p.tx_id == tx_id) {
|
|
// Check if any read contracts were modified by earlier commits.
|
|
for contract_id in &exec.result.reads {
|
|
// In a real implementation, check against confirmed state.
|
|
// For now, assume no conflicts.
|
|
let _ = contract_id;
|
|
}
|
|
false
|
|
} else {
|
|
true // Not found means already committed or rolled back.
|
|
}
|
|
}
|
|
|
|
/// Prunes old pending executions.
|
|
pub fn prune_old(&self, min_block: u64) {
|
|
let mut pending = self.pending.lock();
|
|
let old_count = pending.len();
|
|
|
|
pending.retain(|p| p.predicted_block >= min_block);
|
|
|
|
let pruned = old_count - pending.len();
|
|
if pruned > 0 {
|
|
let mut stats = self.stats.write();
|
|
stats.pruned += pruned as u64;
|
|
}
|
|
}
|
|
|
|
/// Returns speculation statistics.
|
|
pub fn stats(&self) -> SpeculativeStats {
|
|
self.stats.read().clone()
|
|
}
|
|
|
|
/// Returns pending execution count.
|
|
pub fn pending_count(&self) -> usize {
|
|
self.pending.lock().len()
|
|
}
|
|
}
|
|
|
|
/// Context collected during speculative execution.
|
|
#[derive(Clone, Debug, Default)]
|
|
pub struct SpeculativeContext {
|
|
/// Contracts read.
|
|
pub reads: HashSet<ContractId>,
|
|
/// Contracts written.
|
|
pub writes: HashSet<ContractId>,
|
|
/// State changes.
|
|
pub changes: Vec<(ContractId, StorageKey, Option<StorageValue>)>,
|
|
}
|
|
|
|
impl SpeculativeContext {
|
|
/// Creates a new speculative context.
|
|
pub fn new() -> Self {
|
|
Self::default()
|
|
}
|
|
|
|
/// Records a read.
|
|
pub fn record_read(&mut self, contract_id: ContractId) {
|
|
self.reads.insert(contract_id);
|
|
}
|
|
|
|
/// Records a write.
|
|
pub fn record_write(
|
|
&mut self,
|
|
contract_id: ContractId,
|
|
key: StorageKey,
|
|
value: Option<StorageValue>,
|
|
) {
|
|
self.writes.insert(contract_id);
|
|
self.changes.push((contract_id, key, value));
|
|
}
|
|
}
|
|
|
|
/// Speculation statistics.
|
|
#[derive(Clone, Debug, Default)]
|
|
pub struct SpeculativeStats {
|
|
/// Total speculative executions.
|
|
pub speculative_executions: u64,
|
|
/// Successfully committed.
|
|
pub committed: u64,
|
|
/// Rolled back due to conflicts.
|
|
pub rolled_back: u64,
|
|
/// Pruned due to age.
|
|
pub pruned: u64,
|
|
}
|
|
|
|
impl SpeculativeStats {
|
|
/// Returns the commit rate.
|
|
pub fn commit_rate(&self) -> f64 {
|
|
let total = self.committed + self.rolled_back;
|
|
if total == 0 {
|
|
1.0
|
|
} else {
|
|
self.committed as f64 / total as f64
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use crate::Hash256;
|
|
|
|
fn make_contract_id(n: u8) -> ContractId {
|
|
ContractId::new(Hash256::from_bytes([n; 32]))
|
|
}
|
|
|
|
fn make_key(n: u8) -> StorageKey {
|
|
StorageKey([n; 32])
|
|
}
|
|
|
|
fn make_value(n: u8) -> StorageValue {
|
|
StorageValue(vec![n])
|
|
}
|
|
|
|
#[test]
|
|
fn test_contract_cache() {
|
|
let id = make_contract_id(1);
|
|
let mut cache = ContractCache::new(id, 10);
|
|
|
|
// Insert and get.
|
|
let key = make_key(1);
|
|
cache.insert(key.clone(), Some(make_value(1)), StateVersion(1));
|
|
|
|
let result = cache.get(&key, 100);
|
|
assert!(result.is_some());
|
|
assert_eq!(result.unwrap().value, Some(make_value(1)));
|
|
|
|
// Check stats.
|
|
assert_eq!(cache.stats().hits, 1);
|
|
assert_eq!(cache.stats().inserts, 1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_cache_eviction() {
|
|
let id = make_contract_id(1);
|
|
let mut cache = ContractCache::new(id, 3);
|
|
|
|
// Fill cache.
|
|
for i in 0..3 {
|
|
cache.insert(make_key(i), Some(make_value(i)), StateVersion(1));
|
|
}
|
|
|
|
// Access one entry to make it hot.
|
|
for _ in 0..10 {
|
|
cache.get(&make_key(1), 100);
|
|
}
|
|
|
|
// Insert new entry, should evict coldest.
|
|
cache.insert(make_key(10), Some(make_value(10)), StateVersion(2));
|
|
|
|
// Hot entry should still be there.
|
|
assert!(cache.get(&make_key(1), 100).is_some());
|
|
// One cold entry should be evicted.
|
|
assert_eq!(cache.entries.len(), 3);
|
|
}
|
|
|
|
#[test]
|
|
fn test_hot_state_cache() {
|
|
let config = SpeculativeConfig::default();
|
|
let cache = HotStateCache::new(config);
|
|
|
|
let contract_id = make_contract_id(1);
|
|
let key = make_key(1);
|
|
let value = make_value(42);
|
|
|
|
// Insert.
|
|
cache.insert(contract_id, key.clone(), Some(value.clone()));
|
|
|
|
// Get.
|
|
let result = cache.get(contract_id, &key, 100);
|
|
assert_eq!(result, Some(Some(value)));
|
|
|
|
// Version advanced.
|
|
assert!(cache.version().0 > 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_speculative_executor() {
|
|
let config = SpeculativeConfig::default();
|
|
let executor = SpeculativeExecutor::new(config);
|
|
|
|
executor.set_block_height(100);
|
|
assert_eq!(executor.block_height(), 100);
|
|
|
|
// Create snapshot.
|
|
let snapshot = executor.create_snapshot();
|
|
assert!(snapshot.version.0 > 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_speculative_context() {
|
|
let mut ctx = SpeculativeContext::new();
|
|
|
|
let contract = make_contract_id(1);
|
|
ctx.record_read(contract);
|
|
ctx.record_write(contract, make_key(1), Some(make_value(1)));
|
|
|
|
assert!(ctx.reads.contains(&contract));
|
|
assert!(ctx.writes.contains(&contract));
|
|
assert_eq!(ctx.changes.len(), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_state_version_ordering() {
|
|
let v1 = StateVersion(1);
|
|
let v2 = StateVersion(2);
|
|
|
|
assert!(v1 < v2);
|
|
assert_eq!(v1.next(), v2);
|
|
}
|
|
|
|
#[test]
|
|
fn test_speculative_stats() {
|
|
let stats = SpeculativeStats {
|
|
speculative_executions: 100,
|
|
committed: 90,
|
|
rolled_back: 10,
|
|
pruned: 5,
|
|
};
|
|
|
|
assert!((stats.commit_rate() - 0.9).abs() < 0.001);
|
|
}
|
|
|
|
#[test]
|
|
fn test_cache_invalidation() {
|
|
let id = make_contract_id(1);
|
|
let mut cache = ContractCache::new(id, 10);
|
|
|
|
// Insert entries at different versions.
|
|
cache.insert(make_key(1), Some(make_value(1)), StateVersion(1));
|
|
cache.insert(make_key(2), Some(make_value(2)), StateVersion(2));
|
|
cache.insert(make_key(3), Some(make_value(3)), StateVersion(3));
|
|
|
|
// Invalidate older than version 2.
|
|
cache.invalidate_older_than(StateVersion(2));
|
|
|
|
// Version 1 should be gone.
|
|
assert!(cache.get(&make_key(1), 100).is_none());
|
|
// Versions 2 and 3 should remain.
|
|
assert!(cache.get(&make_key(2), 100).is_some());
|
|
assert!(cache.get(&make_key(3), 100).is_some());
|
|
}
|
|
}
|