{
  "id": 15121668,
  "title": "Belady's Anomaly: FIFO vs LRU vs Optimal, Checked in Python",
  "url": "https://urgent.news/2026/10/17/beladys-anomaly-fifo-vs-lru-vs-optimal-checked-in-python",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-10-17T04:55:09.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/realdev9868/beladys-anomaly-fifo-vs-lru-vs-optimal-checked-in-python-5f3m"
  },
  "original_language": "en",
  "account": "This article examines the Belady's anomaly phenomenon in page replacement algorithms, specifically FIFO, LRU, and Optimal policies. It provides a Python implementation for each of these methods to check and compare their performance on a given reference string with 3 and 4 frames. The reference string used for the example is 1 2 3 4 1 2 5 1 2.",
  "summary": "Page replacement questions in GATE CS are mostly counting. You get a reference string, a number of frames and a policy, and you write a row of letters. The idea is easy; the marks go when you lose track of the oldest page late in the paper. So the useful skill is a method you can run without thinking, plus a way to check yourself on practice problems. I wrote a small Python checker for the second…",
  "key_points": [],
  "editors_take": "Comparing these specific page replacement policies through Python implementations clarifies how certain memory management strategies can paradoxically perform worse as available resources increase.",
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}