L1 Cache

Definitions

1. The smallest and fastest cache memory embedded directly on each CPU core, typically split into separate instruction (L1i) and data (L1d) caches of 32–64 KB each, with access latencies around 1–4 clock cycles.

   In plain English: A tiny, ultra-fast memory built into each processor core that stores the data and instructions the CPU is using right now.

   Example: "That tight loop fits entirely in L1 cache, which is why it benchmarks at twice the speed of the version with pointer chasing."

Related Terms

• Swap
• connection pool
• WebAssembly
• Clock Speed
• Branch Prediction
• L2 Cache
• L3 Cache
• Machine Instruction
• Memory Alignment
• Program Counter
• Spectre