memory-leak-detection

SKILL.md

Memory Leak Detection

Table of Contents

Overview

When to Use

Quick Start

Reference Guides

Best Practices

Overview

Identify and fix memory leaks to prevent out-of-memory crashes and optimize application performance.

When to Use

Memory usage growing over time

Out of memory (OOM) errors

Performance degradation

Container restarts

High memory consumption

Quick Start

Minimal working example:

import v8 from "v8";
import fs from "fs";

class MemoryProfiler {
  takeSnapshot(filename: string): void {
    const snapshot = v8.writeHeapSnapshot(filename);
    console.log(`Heap snapshot saved to ${snapshot}`);
  }

  getMemoryUsage(): NodeJS.MemoryUsage {
    return process.memoryUsage();
  }

  formatMemory(bytes: number): string {
    return `${(bytes / 1024 / 1024).toFixed(2)} MB`;
  }

  printMemoryUsage(): void {
    const usage = this.getMemoryUsage();

    console.log("Memory Usage:");
    console.log(`  RSS: ${this.formatMemory(usage.rss)}`);
    console.log(`  Heap Total: ${this.formatMemory(usage.heapTotal)}`);
    console.log(`  Heap Used: ${this.formatMemory(usage.heapUsed)}`);
    console.log(`  External: ${this.formatMemory(usage.external)}`);
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Guide
Contents

Node.js Heap Snapshots
Node.js Heap Snapshots

Memory Leak Detection Middleware
Memory Leak Detection Middleware

Common Memory Leak Patterns
Common Memory Leak Patterns

Python Memory Profiling
Python Memory Profiling

WeakMap/WeakRef for Cache
WeakMap/WeakRef for Cache

Memory Monitoring in Production
Memory Monitoring in Production

Best Practices

✅ DO

Remove event listeners when done

Clear timers and intervals

Use WeakMap/WeakRef for caches

Limit cache sizes

Monitor memory in production

Profile regularly

Clean up after tests

❌ DON'T

Create circular references

Hold references to large objects unnecessarily

Forget to clean up resources

Ignore memory growth

Skip WeakMap for object caches

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