Caching Strategies Simulator — Interactive System Design Lab

Add cache entries and trigger reads to watch LRU (Least Recently Used) eviction happen in real time. The cache always promotes the most recently accessed item to the top and evicts the bottom entry when full — a pattern used by Redis, Memcached, and every major caching layer.

See LRU eviction in action — watch which cache entry gets bumped on every access.

This free interactive simulation runs directly in your browser — no account needed. Adjust the parameters and watch how the system responds in real time.

Concepts covered

• caching
• LRU
• cache eviction
• cache hit rate
• Redis
• Memcached
• least recently used

Read the guide

• Caching — The single most effective way to scale a system. Learn the patterns (Write-Through vs Write-Back), the Eviction policies, and the dangers of the Thundering Herd.