#Cache

I only used Redis as a cache until I discovered it handles sessions, leaderboards, pub/sub, and rate limiting. It's a Swiss Army knife.

Look-aside pattern vs Write-Through. LRU Eviction explained. Persistence trade-offs (RDB vs AOF). Single-threaded nature of Redis.

Arrays are apartments, Linked Lists are scavenger hunts. Deep dive into Node structure, O(1) insertion, Memory Fragmentation, LRU Cache, and Circular Linked Lists.

Arrays use contiguous memory seats. Deep dive into O(1) Access formula, CPU Cache Locality, Buffer Overflow security risks, and Dynamic Array resizing logic.

Why is CPU switching expensive? Cache Pollution, TLB Flush, Kernel Mode, vmstat tuning, and deep dive into Linux Kernel's switch_to macro.

90% of CPU performance is determined by cache. From data locality and MESI protocol to cache mapping, TLB, branch prediction, and NUMA.