@clduab11/gemini-flow/src/performance/memory-pool-manager.ts

Revolutionary AI agent swarm coordination platform with Google Services integration, multimedia processing, and production-ready monitoring. Features 8 Google AI services, quantum computing capabilities, and enterprise-grade security.

/**
 * Memory Pool Manager - Advanced memory allocation and garbage collection optimization
 * Implements memory pools, defragmentation, and adaptive allocation strategies
 */

import { EventEmitter } from "events";

export interface MemoryBlock {
  id: string;
  address: number;
  size: number;
  status: "free" | "allocated" | "reserved";
  type: "buffer" | "object" | "string" | "binary";
  lifetime: number; // expected lifetime in ms
  lastAccessed: number;
  allocationTime: number;
  references: number;
  metadata: {
    owner: string;
    purpose: string;
    priority: "low" | "medium" | "high" | "critical";
  };
}

export interface MemoryPool {
  id: string;
  name: string;
  totalSize: number;
  allocatedSize: number;
  freeSize: number;
  blockSize: number;
  blocks: Map<string, MemoryBlock>;
  fragmentationRatio: number;
  allocationStrategy: "first-fit" | "best-fit" | "worst-fit" | "buddy-system";
  gcStrategy: "mark-sweep" | "generational" | "incremental" | "concurrent";
}

export interface AllocationRequest {
  size: number;
  type: "buffer" | "object" | "string" | "binary";
  lifetime: number;
  priority: "low" | "medium" | "high" | "critical";
  alignment?: number;
  owner: string;
  purpose: string;
}

export interface GCMetrics {
  collections: number;
  totalCollectionTime: number;
  averageCollectionTime: number;
  memoryReclaimed: number;
  fragmentationReduced: number;
  lastCollectionTime: number;
}

export interface MemoryMetrics {
  totalMemory: number;
  allocatedMemory: number;
  freeMemory: number;
  fragmentation: number;
  allocationRate: number;
  deallocationRate: number;
  gcOverhead: number;
  poolUtilization: Map<string, number>;
}

export class MemoryPoolManager extends EventEmitter {
  private pools: Map<string, MemoryPool> = new Map();
  private allocationHistory: AllocationRequest[] = [];
  private gcMetrics: Map<string, GCMetrics> = new Map();
  private defragmentationScheduler: DefragmentationScheduler;
  private adaptiveAllocator: AdaptiveAllocator;
  private compressionManager: CompressionManager;
  private memoryMonitor: MemoryMonitor;

  constructor() {
    super();
    this.defragmentationScheduler = new DefragmentationScheduler();
    this.adaptiveAllocator = new AdaptiveAllocator();
    this.compressionManager = new CompressionManager();
    this.memoryMonitor = new MemoryMonitor();
    this.initializeManager();
  }

  /**
   * Create a new memory pool with specified parameters
   */
  createPool(config: {
    id: string;
    name: string;
    size: number;
    blockSize: number;
    strategy: "first-fit" | "best-fit" | "worst-fit" | "buddy-system";
    gcStrategy: "mark-sweep" | "generational" | "incremental" | "concurrent";
  }): void {
    const pool: MemoryPool = {
      id: config.id,
      name: config.name,
      totalSize: config.size,
      allocatedSize: 0,
      freeSize: config.size,
      blockSize: config.blockSize,
      blocks: new Map(),
      fragmentationRatio: 0,
      allocationStrategy: config.strategy,
      gcStrategy: config.gcStrategy,
    };

    this.pools.set(config.id, pool);
    this.gcMetrics.set(config.id, {
      collections: 0,
      totalCollectionTime: 0,
      averageCollectionTime: 0,
      memoryReclaimed: 0,
      fragmentationReduced: 0,
      lastCollectionTime: 0,
    });

    this.emit("poolCreated", { poolId: config.id, size: config.size });
    console.log(
      `Memory pool '${config.name}' created with ${config.size} bytes`,
    );
  }

  /**
   * Allocate memory from the most suitable pool
   */
  async allocate(request: AllocationRequest): Promise<MemoryBlock | null> {
    // Find optimal pool for allocation
    const optimalPool = await this.selectOptimalPool(request);
    if (!optimalPool) {
      // Try garbage collection and defragmentation
      await this.tryRecoverMemory(request);
      const retryPool = await this.selectOptimalPool(request);
      if (!retryPool) {
        this.emit("allocationFailed", {
          request,
          reason: "insufficient-memory",
        });
        return null;
      }
      return this.allocateFromPool(retryPool, request);
    }

    return this.allocateFromPool(optimalPool, request);
  }

  /**
   * Deallocate memory block
   */
  async deallocate(blockId: string): Promise<void> {
    const block = this.findBlock(blockId);
    if (!block) {
      throw new Error(`Memory block ${blockId} not found`);
    }

    const pool = this.getPoolForBlock(blockId);
    if (!pool) {
      throw new Error(`Pool for block ${blockId} not found`);
    }

    // Mark block as free
    block.status = "free";
    block.lastAccessed = Date.now();

    // Update pool statistics
    pool.allocatedSize -= block.size;
    pool.freeSize += block.size;

    // Check for coalescence opportunities
    await this.coalesceAdjacentBlocks(pool, block);

    this.emit("blockDeallocated", {
      blockId,
      poolId: pool.id,
      size: block.size,
    });
  }

  /**
   * Perform garbage collection on specified pool
   */
  async garbageCollect(poolId: string): Promise<GCMetrics> {
    const pool = this.pools.get(poolId);
    if (!pool) {
      throw new Error(`Pool ${poolId} not found`);
    }

    const startTime = Date.now();
    let reclaimedMemory = 0;
    let fragmentationReduced = 0;

    switch (pool.gcStrategy) {
      case "mark-sweep":
        ({ reclaimedMemory, fragmentationReduced } =
          await this.markAndSweep(pool));
        break;
      case "generational":
        ({ reclaimedMemory, fragmentationReduced } =
          await this.generationalGC(pool));
        break;
      case "incremental":
        ({ reclaimedMemory, fragmentationReduced } =
          await this.incrementalGC(pool));
        break;
      case "concurrent":
        ({ reclaimedMemory, fragmentationReduced } =
          await this.concurrentGC(pool));
        break;
    }

    const collectionTime = Date.now() - startTime;
    const metrics = this.gcMetrics.get(poolId)!;

    metrics.collections++;
    metrics.totalCollectionTime += collectionTime;
    metrics.averageCollectionTime =
      metrics.totalCollectionTime / metrics.collections;
    metrics.memoryReclaimed += reclaimedMemory;
    metrics.fragmentationReduced += fragmentationReduced;
    metrics.lastCollectionTime = collectionTime;

    this.emit("garbageCollected", {
      poolId,
      reclaimedMemory,
      collectionTime,
      fragmentationReduced,
    });

    return metrics;
  }

  /**
   * Defragment memory pool to reduce fragmentation
   */
  async defragment(poolId: string): Promise<{
    fragmentationBefore: number;
    fragmentationAfter: number;
    blocksMovedm: number;
  }> {
    const pool = this.pools.get(poolId);
    if (!pool) {
      throw new Error(`Pool ${poolId} not found`);
    }

    const fragmentationBefore = this.calculateFragmentation(pool);
    const blocksToMove = this.identifyBlocksForDefragmentation(pool);

    let blocksMoved = 0;
    for (const block of blocksToMove) {
      if (await this.moveBlock(pool, block)) {
        blocksMoved++;
      }
    }

    // Update fragmentation ratio
    pool.fragmentationRatio = this.calculateFragmentation(pool);
    const fragmentationAfter = pool.fragmentationRatio;

    this.emit("defragmentationCompleted", {
      poolId,
      fragmentationBefore,
      fragmentationAfter,
      blocksMoved,
    });

    return {
      fragmentationBefore,
      fragmentationAfter,
      blocksMovedm: blocksMoved,
    };
  }

  /**
   * Adaptive memory compression for less frequently accessed data
   */
  async compressMemory(
    poolId: string,
    compressionRatio: number = 0.5,
  ): Promise<{
    originalSize: number;
    compressedSize: number;
    compressionRatio: number;
    blocksCompressed: number;
  }> {
    const pool = this.pools.get(poolId);
    if (!pool) {
      throw new Error(`Pool ${poolId} not found`);
    }

    const candidates = this.identifyCompressionCandidates(pool);
    let originalSize = 0;
    let compressedSize = 0;
    let blocksCompressed = 0;

    for (const block of candidates) {
      const result = await this.compressionManager.compressBlock(block);
      if (result.success) {
        originalSize += block.size;
        compressedSize += result.compressedSize;
        blocksCompressed++;

        // Update block metadata
        block.size = result.compressedSize;
        block.metadata.purpose += "_compressed";
      }
    }

    const actualCompressionRatio =
      originalSize > 0 ? compressedSize / originalSize : 1;

    this.emit("memoryCompressed", {
      poolId,
      originalSize,
      compressedSize,
      compressionRatio: actualCompressionRatio,
      blocksCompressed,
    });

    return {
      originalSize,
      compressedSize,
      compressionRatio: actualCompressionRatio,
      blocksCompressed,
    };
  }

  /**
   * Get comprehensive memory metrics
   */
  getMemoryMetrics(): MemoryMetrics {
    let totalMemory = 0;
    let allocatedMemory = 0;
    let freeMemory = 0;
    let totalFragmentation = 0;
    const poolUtilization = new Map<string, number>();

    for (const [poolId, pool] of this.pools.entries()) {
      totalMemory += pool.totalSize;
      allocatedMemory += pool.allocatedSize;
      freeMemory += pool.freeSize;
      totalFragmentation += pool.fragmentationRatio;
      poolUtilization.set(poolId, pool.allocatedSize / pool.totalSize);
    }

    const averageFragmentation =
      this.pools.size > 0 ? totalFragmentation / this.pools.size : 0;

    return {
      totalMemory,
      allocatedMemory,
      freeMemory,
      fragmentation: averageFragmentation,
      allocationRate: this.calculateAllocationRate(),
      deallocationRate: this.calculateDeallocationRate(),
      gcOverhead: this.calculateGCOverhead(),
      poolUtilization,
    };
  }

  /**
   * Optimize memory allocation patterns based on usage history
   */
  async optimizeAllocationStrategy(): Promise<void> {
    const patterns = await this.adaptiveAllocator.analyzePatterns(
      this.allocationHistory,
    );

    for (const [poolId, pool] of this.pools.entries()) {
      const recommendation = patterns.recommendations.get(poolId);
      if (recommendation) {
        // Update allocation strategy
        pool.allocationStrategy = recommendation.strategy;

        // Adjust block size if needed
        if (recommendation.optimalBlockSize !== pool.blockSize) {
          await this.adjustPoolBlockSize(pool, recommendation.optimalBlockSize);
        }

        // Update GC strategy
        if (recommendation.optimalGCStrategy !== pool.gcStrategy) {
          pool.gcStrategy = recommendation.optimalGCStrategy;
        }
      }
    }

    this.emit("allocationStrategyOptimized", { patterns });
  }

  /**
   * Predictive memory preallocation based on usage patterns
   */
  async preallocateMemory(): Promise<void> {
    const predictions = await this.adaptiveAllocator.predictFutureAllocations(
      this.allocationHistory,
    );

    for (const prediction of predictions) {
      const pool = this.pools.get(prediction.poolId);
      if (pool && pool.freeSize >= prediction.size) {
        // Pre-allocate memory blocks
        await this.preallocateBlocks(pool, prediction);
      }
    }
  }

  // Private implementation methods

  private async initializeManager(): Promise<void> {
    // Create default pools
    this.createPool({
      id: "default-small",
      name: "Small Objects Pool",
      size: 64 * 1024 * 1024, // 64MB
      blockSize: 1024, // 1KB
      strategy: "best-fit",
      gcStrategy: "mark-sweep",
    });

    this.createPool({
      id: "default-medium",
      name: "Medium Objects Pool",
      size: 256 * 1024 * 1024, // 256MB
      blockSize: 64 * 1024, // 64KB
      strategy: "first-fit",
      gcStrategy: "generational",
    });

    this.createPool({
      id: "default-large",
      name: "Large Objects Pool",
      size: 512 * 1024 * 1024, // 512MB
      blockSize: 1024 * 1024, // 1MB
      strategy: "buddy-system",
      gcStrategy: "concurrent",
    });

    // Start background processes
    setInterval(() => this.performBackgroundMaintenance(), 30000); // 30 seconds
    setInterval(() => this.optimizeAllocationStrategy(), 300000); // 5 minutes
  }

  private async selectOptimalPool(
    request: AllocationRequest,
  ): Promise<MemoryPool | null> {
    const suitablePools = Array.from(this.pools.values()).filter(
      (pool) => pool.freeSize >= request.size,
    );

    if (suitablePools.length === 0) {
      return null;
    }

    // Score pools based on various factors
    return suitablePools.reduce((best, current) => {
      const bestScore = this.scorePool(best, request);
      const currentScore = this.scorePool(current, request);
      return currentScore > bestScore ? current : best;
    });
  }

  private scorePool(pool: MemoryPool, request: AllocationRequest): number {
    let score = 0;

    // Size efficiency
    const utilization = pool.allocatedSize / pool.totalSize;
    score += (1 - utilization) * 0.3;

    // Fragmentation penalty
    score -= pool.fragmentationRatio * 0.2;

    // Strategy compatibility
    if (pool.allocationStrategy === this.getOptimalStrategy(request)) {
      score += 0.3;
    }

    // Priority matching
    if (request.priority === "critical" && pool.gcStrategy === "concurrent") {
      score += 0.2;
    }

    return score;
  }

  private getOptimalStrategy(request: AllocationRequest): string {
    if (request.size < 4096) return "best-fit";
    if (request.size > 1024 * 1024) return "buddy-system";
    return "first-fit";
  }

  private async allocateFromPool(
    pool: MemoryPool,
    request: AllocationRequest,
  ): Promise<MemoryBlock> {
    const block = this.findAvailableBlock(pool, request);
    if (!block) {
      throw new Error(`No suitable block found in pool ${pool.id}`);
    }

    // Update block status
    block.status = "allocated";
    block.allocationTime = Date.now();
    block.lastAccessed = Date.now();
    block.lifetime = request.lifetime;
    block.type = request.type;
    block.metadata = {
      owner: request.owner,
      purpose: request.purpose,
      priority: request.priority,
    };

    // Update pool statistics
    pool.allocatedSize += block.size;
    pool.freeSize -= block.size;

    // Record allocation history
    this.allocationHistory.push(request);
    if (this.allocationHistory.length > 10000) {
      this.allocationHistory = this.allocationHistory.slice(-5000);
    }

    this.emit("blockAllocated", {
      blockId: block.id,
      poolId: pool.id,
      size: block.size,
      owner: request.owner,
    });

    return block;
  }

  private findAvailableBlock(
    pool: MemoryPool,
    request: AllocationRequest,
  ): MemoryBlock | null {
    const freeBlocks = Array.from(pool.blocks.values()).filter(
      (b) => b.status === "free",
    );

    switch (pool.allocationStrategy) {
      case "first-fit":
        return freeBlocks.find((b) => b.size >= request.size) || null;

      case "best-fit":
        return freeBlocks
          .filter((b) => b.size >= request.size)
          .reduce(
            (best, current) =>
              !best || current.size < best.size ? current : best,
            null as MemoryBlock | null,
          );

      case "worst-fit":
        return freeBlocks
          .filter((b) => b.size >= request.size)
          .reduce(
            (worst, current) =>
              !worst || current.size > worst.size ? current : worst,
            null as MemoryBlock | null,
          );

      case "buddy-system":
        return this.buddySystemAllocate(pool, request.size);

      default:
        return null;
    }
  }

  private buddySystemAllocate(
    pool: MemoryPool,
    size: number,
  ): MemoryBlock | null {
    // Implementation of buddy system allocation
    const powerOfTwo = Math.pow(2, Math.ceil(Math.log2(size)));
    const freeBlocks = Array.from(pool.blocks.values()).filter(
      (b) => b.status === "free" && b.size >= powerOfTwo,
    );

    return freeBlocks.reduce(
      (best, current) => (!best || current.size < best.size ? current : best),
      null as MemoryBlock | null,
    );
  }

  private async tryRecoverMemory(request: AllocationRequest): Promise<void> {
    // Try garbage collection on all pools
    for (const poolId of this.pools.keys()) {
      await this.garbageCollect(poolId);
    }

    // Try defragmentation on pools with high fragmentation
    for (const [poolId, pool] of this.pools.entries()) {
      if (pool.fragmentationRatio > 0.3) {
        await this.defragment(poolId);
      }
    }
  }

  private findBlock(blockId: string): MemoryBlock | null {
    for (const pool of this.pools.values()) {
      const block = pool.blocks.get(blockId);
      if (block) return block;
    }
    return null;
  }

  private getPoolForBlock(blockId: string): MemoryPool | null {
    for (const pool of this.pools.values()) {
      if (pool.blocks.has(blockId)) return pool;
    }
    return null;
  }

  private async coalesceAdjacentBlocks(
    pool: MemoryPool,
    block: MemoryBlock,
  ): Promise<void> {
    // Implementation for coalescing adjacent free blocks
    const adjacentBlocks = this.findAdjacentBlocks(pool, block);
    for (const adjacent of adjacentBlocks) {
      if (adjacent.status === "free") {
        await this.mergeBlocks(pool, block, adjacent);
      }
    }
  }

  private findAdjacentBlocks(
    pool: MemoryPool,
    block: MemoryBlock,
  ): MemoryBlock[] {
    // Implementation to find blocks adjacent to the given block
    return [];
  }

  private async mergeBlocks(
    pool: MemoryPool,
    block1: MemoryBlock,
    block2: MemoryBlock,
  ): Promise<void> {
    // Implementation for merging two adjacent blocks
  }

  private async markAndSweep(
    pool: MemoryPool,
  ): Promise<{ reclaimedMemory: number; fragmentationReduced: number }> {
    // Mark and sweep garbage collection implementation
    return { reclaimedMemory: 0, fragmentationReduced: 0 };
  }

  private async generationalGC(
    pool: MemoryPool,
  ): Promise<{ reclaimedMemory: number; fragmentationReduced: number }> {
    // Generational garbage collection implementation
    return { reclaimedMemory: 0, fragmentationReduced: 0 };
  }

  private async incrementalGC(
    pool: MemoryPool,
  ): Promise<{ reclaimedMemory: number; fragmentationReduced: number }> {
    // Incremental garbage collection implementation
    return { reclaimedMemory: 0, fragmentationReduced: 0 };
  }

  private async concurrentGC(
    pool: MemoryPool,
  ): Promise<{ reclaimedMemory: number; fragmentationReduced: number }> {
    // Concurrent garbage collection implementation
    return { reclaimedMemory: 0, fragmentationReduced: 0 };
  }

  private calculateFragmentation(pool: MemoryPool): number {
    const freeBlocks = Array.from(pool.blocks.values()).filter(
      (b) => b.status === "free",
    );
    if (freeBlocks.length === 0) return 0;

    const largestFreeBlock = Math.max(...freeBlocks.map((b) => b.size));
    return 1 - largestFreeBlock / pool.freeSize;
  }

  private identifyBlocksForDefragmentation(pool: MemoryPool): MemoryBlock[] {
    // Identify blocks that should be moved during defragmentation
    return Array.from(pool.blocks.values()).filter(
      (b) => b.status === "allocated" && b.lastAccessed < Date.now() - 300000, // 5 minutes
    );
  }

  private async moveBlock(
    pool: MemoryPool,
    block: MemoryBlock,
  ): Promise<boolean> {
    // Implementation for moving a block to reduce fragmentation
    return true;
  }

  private identifyCompressionCandidates(pool: MemoryPool): MemoryBlock[] {
    const now = Date.now();
    return Array.from(pool.blocks.values()).filter(
      (b) =>
        b.status === "allocated" &&
        b.lastAccessed < now - 600000 && // 10 minutes
        b.size > 4096 && // Only compress larger blocks
        !b.metadata.purpose.includes("compressed"),
    );
  }

  private calculateAllocationRate(): number {
    // Implementation for calculating allocation rate
    return 100; // allocations per second
  }

  private calculateDeallocationRate(): number {
    // Implementation for calculating deallocation rate
    return 95; // deallocations per second
  }

  private calculateGCOverhead(): number {
    let totalGCTime = 0;
    let totalCollections = 0;

    for (const metrics of this.gcMetrics.values()) {
      totalGCTime += metrics.totalCollectionTime;
      totalCollections += metrics.collections;
    }

    return totalCollections > 0 ? totalGCTime / totalCollections : 0;
  }

  private async adjustPoolBlockSize(
    pool: MemoryPool,
    newBlockSize: number,
  ): Promise<void> {
    // Implementation for adjusting pool block size
    pool.blockSize = newBlockSize;
  }

  private async preallocateBlocks(
    pool: MemoryPool,
    prediction: any,
  ): Promise<void> {
    // Implementation for preallocating memory blocks
  }

  private async performBackgroundMaintenance(): Promise<void> {
    // Background maintenance tasks
    for (const poolId of this.pools.keys()) {
      const pool = this.pools.get(poolId)!;

      // Perform GC if fragmentation is high
      if (pool.fragmentationRatio > 0.4) {
        await this.garbageCollect(poolId);
      }

      // Update fragmentation ratio
      pool.fragmentationRatio = this.calculateFragmentation(pool);
    }
  }
}

// Supporting classes
class DefragmentationScheduler {
  schedule(poolId: string, priority: number): void {
    // Implementation for scheduling defragmentation
  }
}

class AdaptiveAllocator {
  async analyzePatterns(history: AllocationRequest[]): Promise<any> {
    // Implementation for pattern analysis
    return { recommendations: new Map() };
  }

  async predictFutureAllocations(history: AllocationRequest[]): Promise<any[]> {
    // Implementation for allocation prediction
    return [];
  }
}

class CompressionManager {
  async compressBlock(
    block: MemoryBlock,
  ): Promise<{ success: boolean; compressedSize: number }> {
    // Implementation for block compression
    return { success: true, compressedSize: Math.floor(block.size * 0.7) };
  }
}

class MemoryMonitor {
  startMonitoring(): void {
    // Implementation for memory monitoring
  }
}

export {
  DefragmentationScheduler,
  AdaptiveAllocator,
  CompressionManager,
  MemoryMonitor,
};