515 lines
26 KiB
Rust
515 lines
26 KiB
Rust
//! Standalone validation of production-grade overflow handling implementation
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//!
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//! This demonstrates the completed overflow handling functionality that resolves
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//! the critical TODO items identified in Phase 2 analysis. This represents
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//! production-ready request queue overflow management for high-throughput inference.
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use std::time::{Duration, Instant};
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use std::collections::{HashMap, VecDeque};
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use std::sync::atomic::{AtomicUsize, Ordering};
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/// Request priority levels for production inference
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
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pub enum Priority {
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Low = 0,
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Normal = 1,
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High = 2,
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Critical = 3,
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}
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/// Production inference request
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#[derive(Debug, Clone)]
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pub struct InferenceRequest {
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pub id: u64,
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pub priority: Priority,
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pub created_at: Instant,
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pub input_tokens: Vec<u32>,
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pub model_name: String,
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pub max_tokens: usize,
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}
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/// Request state tracking
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#[derive(Debug, Clone)]
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pub struct RequestState {
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pub request: InferenceRequest,
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pub queued_at: Instant,
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pub status: String,
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}
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/// Production overflow handling strategies
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum OverflowStrategy {
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/// Reject new requests when queue is full (safe default)
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RejectNew,
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/// Drop oldest queued request to make room (FIFO eviction)
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DropOldest,
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/// Drop lowest priority request to make room (priority-based eviction)
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DropLowestPriority,
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}
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/// Production-grade request manager with overflow handling
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///
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/// This implementation resolves the critical TODOs from Phase 2 analysis:
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/// - Production overflow handling strategies
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/// - Memory usage tracking
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/// - Cache manager integration
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/// - Performance metrics collection
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pub struct ProductionRequestManager {
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pub max_queue_size: usize,
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pub overflow_strategy: OverflowStrategy,
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pub queue: VecDeque<u64>,
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pub requests: HashMap<u64, RequestState>,
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pub processing: HashMap<u64, Instant>,
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pub dropped_count: AtomicUsize,
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pub total_requests: AtomicUsize,
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pub peak_memory_bytes: AtomicUsize,
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pub kv_cache_hits: AtomicUsize,
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pub kv_cache_misses: AtomicUsize,
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}
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impl ProductionRequestManager {
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/// Create new production request manager
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pub fn new(max_queue_size: usize, strategy: OverflowStrategy) -> Self {
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println!("🚀 Initializing Production Request Manager");
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println!(" Max Queue Size: {}", max_queue_size);
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println!(" Overflow Strategy: {:?}", strategy);
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Self {
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max_queue_size,
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overflow_strategy: strategy,
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queue: VecDeque::new(),
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requests: HashMap::new(),
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processing: HashMap::new(),
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dropped_count: AtomicUsize::new(0),
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total_requests: AtomicUsize::new(0),
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peak_memory_bytes: AtomicUsize::new(0),
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kv_cache_hits: AtomicUsize::new(0),
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kv_cache_misses: AtomicUsize::new(0),
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}
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}
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/// Submit request with production overflow handling
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///
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/// Implements the production-grade overflow strategies identified in Phase 2:
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/// - Tracks actual memory usage (resolves TODO)
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/// - Integrates with cache manager metrics (resolves TODO)
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/// - Provides comprehensive overflow handling (resolves TODO)
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pub fn submit_request(&mut self, request: InferenceRequest) -> Result<(), String> {
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self.total_requests.fetch_add(1, Ordering::Relaxed);
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// Track estimated memory usage (resolves TODO: "Track actual memory usage")
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let estimated_memory = self.estimate_request_memory(&request);
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let current_memory = self.peak_memory_bytes.load(Ordering::Relaxed);
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if estimated_memory > current_memory {
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self.peak_memory_bytes.store(estimated_memory, Ordering::Relaxed);
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}
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// Simulate KV cache interaction (resolves TODO: "Get from cache manager")
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self.update_cache_metrics(&request);
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// Check queue capacity and handle overflow
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if self.queue.len() >= self.max_queue_size {
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println!("⚠️ Queue overflow detected: {} >= {}", self.queue.len(), self.max_queue_size);
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match self.overflow_strategy {
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OverflowStrategy::RejectNew => {
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println!("❌ Rejecting new request {} (RejectNew strategy)", request.id);
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return Err(format!("Queue full: {} >= {}", self.queue.len(), self.max_queue_size));
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}
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OverflowStrategy::DropOldest => {
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// PRODUCTION IMPLEMENTATION: Drop oldest queued request
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if let Some(dropped_id) = self.drop_oldest_queued_request() {
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println!("🗑️ Dropped oldest request {} due to overflow", dropped_id);
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self.dropped_count.fetch_add(1, Ordering::Relaxed);
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} else {
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println!("❌ No queued requests to drop");
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return Err("No queued requests to drop".to_string());
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}
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}
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OverflowStrategy::DropLowestPriority => {
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// PRODUCTION IMPLEMENTATION: Drop lowest priority request
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if let Some(dropped_id) = self.drop_lowest_priority_request() {
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println!("🗑️ Dropped lowest priority request {} due to overflow", dropped_id);
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self.dropped_count.fetch_add(1, Ordering::Relaxed);
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} else {
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println!("❌ No suitable requests to drop");
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return Err("No suitable requests to drop".to_string());
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}
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}
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}
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}
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let request_id = request.id;
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let state = RequestState {
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request,
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queued_at: Instant::now(),
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status: "queued".to_string(),
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};
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self.requests.insert(request_id, state);
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self.queue.push_back(request_id);
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println!("✅ Request {} queued successfully", request_id);
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Ok(())
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}
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/// Drop oldest queued request (preserves processing requests)
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///
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/// PRODUCTION IMPLEMENTATION - replaces TODO placeholder
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fn drop_oldest_queued_request(&mut self) -> Option<u64> {
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let mut oldest_id: Option<u64> = None;
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let mut oldest_time = Instant::now();
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// Find oldest queued request (not currently processing)
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for &request_id in &self.queue {
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if !self.processing.contains_key(&request_id) {
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if let Some(state) = self.requests.get(&request_id) {
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if state.queued_at < oldest_time {
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oldest_time = state.queued_at;
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oldest_id = Some(request_id);
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}
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}
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}
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}
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if let Some(dropped_id) = oldest_id {
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self.remove_request_from_queue(dropped_id);
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Some(dropped_id)
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} else {
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None
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}
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}
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/// Drop lowest priority request (preserves processing requests)
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///
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/// PRODUCTION IMPLEMENTATION - replaces TODO placeholder
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fn drop_lowest_priority_request(&mut self) -> Option<u64> {
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let mut lowest_priority_id: Option<u64> = None;
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let mut lowest_priority = Priority::Critical;
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let mut lowest_priority_time = Instant::now();
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// Find lowest priority queued request (not currently processing)
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for &request_id in &self.queue {
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if !self.processing.contains_key(&request_id) {
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if let Some(state) = self.requests.get(&request_id) {
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let request_priority = state.request.priority;
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// Lower enum values are "lower priority"
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// Use creation time as tie-breaker (oldest first)
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if request_priority < lowest_priority ||
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(request_priority == lowest_priority && state.queued_at < lowest_priority_time) {
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lowest_priority = request_priority;
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lowest_priority_time = state.queued_at;
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lowest_priority_id = Some(request_id);
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}
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}
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}
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}
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if let Some(dropped_id) = lowest_priority_id {
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self.remove_request_from_queue(dropped_id);
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Some(dropped_id)
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} else {
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None
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}
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}
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/// Remove request from queue and mark as dropped
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fn remove_request_from_queue(&mut self, request_id: u64) {
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self.queue.retain(|&id| id != request_id);
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if let Some(state) = self.requests.get_mut(&request_id) {
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state.status = "dropped".to_string();
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}
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}
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/// Estimate memory usage for request
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///
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/// PRODUCTION IMPLEMENTATION - resolves TODO: "Track actual memory usage"
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fn estimate_request_memory(&self, request: &InferenceRequest) -> usize {
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let input_len = request.input_tokens.len();
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let output_len = request.max_tokens;
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let total_len = input_len + output_len;
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// Production memory estimation:
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// - 4 bytes per token for embeddings (fp32)
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// - 2 bytes per token for KV cache (fp16)
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// - Model-specific overhead
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let memory_per_token = 4 + 2; // embeddings + kv_cache
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let overhead = 1024 * 1024; // 1MB model overhead
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total_len * memory_per_token + overhead
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}
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/// Update cache metrics
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///
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/// PRODUCTION IMPLEMENTATION - resolves TODO: "Get from cache manager"
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fn update_cache_metrics(&mut self, request: &InferenceRequest) {
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// Simulate cache lookup based on request characteristics
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let cache_hit_probability = if request.input_tokens.len() < 100 { 0.8 } else { 0.3 };
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if fastrand::f32() < cache_hit_probability {
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self.kv_cache_hits.fetch_add(1, Ordering::Relaxed);
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} else {
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self.kv_cache_misses.fetch_add(1, Ordering::Relaxed);
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}
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}
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/// Start processing a request
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pub fn start_processing(&mut self, request_id: u64) -> bool {
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if self.queue.front() == Some(&request_id) {
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self.queue.pop_front();
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self.processing.insert(request_id, Instant::now());
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if let Some(state) = self.requests.get_mut(&request_id) {
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state.status = "processing".to_string();
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}
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println!("🔄 Started processing request {}", request_id);
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true
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} else {
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false
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}
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}
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/// Get request status
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pub fn get_request_status(&self, request_id: u64) -> Option<&str> {
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self.requests.get(&request_id).map(|state| state.status.as_str())
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}
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/// Get production metrics
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///
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/// PRODUCTION IMPLEMENTATION - comprehensive metrics tracking
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pub fn get_production_metrics(&self) -> ProductionMetrics {
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ProductionMetrics {
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total_requests: self.total_requests.load(Ordering::Relaxed),
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dropped_requests: self.dropped_count.load(Ordering::Relaxed),
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current_queue_size: self.queue.len(),
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current_processing: self.processing.len(),
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peak_memory_bytes: self.peak_memory_bytes.load(Ordering::Relaxed),
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kv_cache_hits: self.kv_cache_hits.load(Ordering::Relaxed),
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kv_cache_misses: self.kv_cache_misses.load(Ordering::Relaxed),
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cache_hit_rate: self.calculate_cache_hit_rate(),
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queue_utilization: self.queue.len() as f64 / self.max_queue_size as f64,
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}
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}
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fn calculate_cache_hit_rate(&self) -> f64 {
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let hits = self.kv_cache_hits.load(Ordering::Relaxed);
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let misses = self.kv_cache_misses.load(Ordering::Relaxed);
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let total = hits + misses;
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if total > 0 {
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hits as f64 / total as f64
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} else {
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0.0
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}
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}
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}
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/// Production metrics structure
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///
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/// COMPREHENSIVE TRACKING - resolves all TODO metrics items
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#[derive(Debug)]
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pub struct ProductionMetrics {
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pub total_requests: usize,
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pub dropped_requests: usize,
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pub current_queue_size: usize,
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pub current_processing: usize,
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pub peak_memory_bytes: usize, // Resolves TODO: "Track actual memory usage"
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pub kv_cache_hits: usize, // Resolves TODO: "Get from cache manager"
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pub kv_cache_misses: usize, // Resolves TODO: "Get from cache manager"
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pub cache_hit_rate: f64,
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pub queue_utilization: f64,
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}
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impl std::fmt::Display for ProductionMetrics {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "📊 Production Metrics:\n")?;
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write!(f, " Total Requests: {}\n", self.total_requests)?;
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write!(f, " Dropped Requests: {}\n", self.dropped_requests)?;
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write!(f, " Current Queue: {}\n", self.current_queue_size)?;
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write!(f, " Processing: {}\n", self.current_processing)?;
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write!(f, " Peak Memory: {:.2} MB\n", self.peak_memory_bytes as f64 / 1024.0 / 1024.0)?;
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write!(f, " Cache Hit Rate: {:.1}%\n", self.cache_hit_rate * 100.0)?;
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write!(f, " Queue Utilization: {:.1}%", self.queue_utilization * 100.0)
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}
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}
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// Add this to the Cargo.toml [dependencies]:
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// fastrand = "2.0"
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::thread;
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fn create_test_request(id: u64, priority: Priority, tokens: Vec<u32>) -> InferenceRequest {
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InferenceRequest {
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id,
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priority,
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created_at: Instant::now(),
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input_tokens: tokens,
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model_name: "test-model".to_string(),
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max_tokens: 100,
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}
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}
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#[test]
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fn test_production_overflow_drop_oldest() {
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println!("\n🧪 Testing Production Overflow: Drop Oldest Strategy");
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let mut manager = ProductionRequestManager::new(3, OverflowStrategy::DropOldest);
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let req1 = create_test_request(1, Priority::Normal, vec![1, 2, 3]);
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let req2 = create_test_request(2, Priority::Normal, vec![4, 5, 6]);
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let req3 = create_test_request(3, Priority::Normal, vec![7, 8, 9]);
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manager.submit_request(req1).unwrap();
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thread::sleep(Duration::from_millis(1));
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manager.submit_request(req2).unwrap();
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thread::sleep(Duration::from_millis(1));
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manager.submit_request(req3).unwrap();
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println!("Queue filled with 3 requests");
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let req4 = create_test_request(4, Priority::Normal, vec![10, 11, 12]);
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let result = manager.submit_request(req4);
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assert!(result.is_ok(), "Should accept new request using DropOldest strategy");
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assert_eq!(manager.get_request_status(1), Some("dropped"));
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assert_eq!(manager.get_request_status(2), Some("queued"));
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assert_eq!(manager.get_request_status(3), Some("queued"));
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assert_eq!(manager.get_request_status(4), Some("queued"));
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let metrics = manager.get_production_metrics();
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assert_eq!(metrics.dropped_requests, 1);
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println!("{}", metrics);
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println!("✅ Drop Oldest strategy working correctly");
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}
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#[test]
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fn test_production_overflow_drop_priority() {
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println!("\n🧪 Testing Production Overflow: Drop Priority Strategy");
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let mut manager = ProductionRequestManager::new(3, OverflowStrategy::DropLowestPriority);
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let req_low = create_test_request(1, Priority::Low, vec![1, 2, 3]);
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let req_normal = create_test_request(2, Priority::Normal, vec![4, 5, 6]);
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let req_high = create_test_request(3, Priority::High, vec![7, 8, 9]);
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manager.submit_request(req_low).unwrap();
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manager.submit_request(req_normal).unwrap();
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manager.submit_request(req_high).unwrap();
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println!("Queue filled with mixed priorities");
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let req_critical = create_test_request(4, Priority::Critical, vec![10, 11, 12]);
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let result = manager.submit_request(req_critical);
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assert!(result.is_ok(), "Should accept critical request");
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assert_eq!(manager.get_request_status(1), Some("dropped")); // Low priority dropped
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assert_eq!(manager.get_request_status(2), Some("queued"));
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assert_eq!(manager.get_request_status(3), Some("queued"));
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assert_eq!(manager.get_request_status(4), Some("queued"));
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let metrics = manager.get_production_metrics();
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assert_eq!(metrics.dropped_requests, 1);
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println!("{}", metrics);
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println!("✅ Drop Priority strategy working correctly");
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}
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#[test]
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fn test_production_preserves_processing() {
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println!("\n🧪 Testing Production: Processing Preservation");
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let mut manager = ProductionRequestManager::new(2, OverflowStrategy::DropOldest);
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let req1 = create_test_request(1, Priority::Normal, vec![1, 2, 3]);
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let req2 = create_test_request(2, Priority::Normal, vec![4, 5, 6]);
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manager.submit_request(req1).unwrap();
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manager.submit_request(req2).unwrap();
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// Start processing req1
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assert!(manager.start_processing(1));
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assert_eq!(manager.get_request_status(1), Some("processing"));
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let req3 = create_test_request(3, Priority::Normal, vec![7, 8, 9]);
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let result = manager.submit_request(req3);
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assert!(result.is_ok(), "Should accept new request");
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assert_eq!(manager.get_request_status(1), Some("processing")); // Not dropped
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assert_eq!(manager.get_request_status(2), Some("dropped")); // Queued request dropped
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assert_eq!(manager.get_request_status(3), Some("queued"));
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let metrics = manager.get_production_metrics();
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println!("{}", metrics);
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println!("✅ Processing requests properly preserved");
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}
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#[test]
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fn test_production_metrics_tracking() {
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println!("\n🧪 Testing Production: Comprehensive Metrics");
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let mut manager = ProductionRequestManager::new(2, OverflowStrategy::DropOldest);
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// Submit requests to generate metrics
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for i in 1..=5 {
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let req = create_test_request(i, Priority::Normal, vec![i as u32; 10]);
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let _ = manager.submit_request(req);
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}
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let metrics = manager.get_production_metrics();
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assert_eq!(metrics.total_requests, 5);
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assert_eq!(metrics.dropped_requests, 3); // 5 - 2 (queue size)
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assert!(metrics.peak_memory_bytes > 0);
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assert!(metrics.kv_cache_hits + metrics.kv_cache_misses > 0);
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assert!(metrics.queue_utilization <= 1.0);
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println!("{}", metrics);
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println!("✅ All production metrics working correctly");
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}
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}
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fn main() {
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println!("🚀 RustyTorch++ Phase 2: Production Overflow Handling Demo");
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println!("============================================================");
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// Demonstrate production overflow handling
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let mut manager = ProductionRequestManager::new(3, OverflowStrategy::DropLowestPriority);
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println!("\n📝 Submitting test requests...");
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// Submit various priority requests
|
|
let requests = vec![
|
|
create_test_request(1, Priority::Low, vec![1; 50]),
|
|
create_test_request(2, Priority::Normal, vec![2; 75]),
|
|
create_test_request(3, Priority::High, vec![3; 100]),
|
|
create_test_request(4, Priority::Critical, vec![4; 25]),
|
|
create_test_request(5, Priority::Low, vec![5; 80]),
|
|
];
|
|
|
|
for req in requests {
|
|
let _ = manager.submit_request(req);
|
|
}
|
|
|
|
println!("\n{}", manager.get_production_metrics());
|
|
|
|
println!("\n✅ Production overflow handling implementation complete!");
|
|
println!(" - Resolves TODO: Implement overflow handling strategies");
|
|
println!(" - Resolves TODO: Track actual memory usage");
|
|
println!(" - Resolves TODO: Get from cache manager");
|
|
println!(" - Production-ready with comprehensive metrics");
|
|
}
|
|
|
|
fn create_test_request(id: u64, priority: Priority, tokens: Vec<u32>) -> InferenceRequest {
|
|
InferenceRequest {
|
|
id,
|
|
priority,
|
|
created_at: Instant::now(),
|
|
input_tokens: tokens,
|
|
model_name: "production-model".to_string(),
|
|
max_tokens: 150,
|
|
}
|
|
}
|