Memory Layout Optimization
Topic:
architecture.memory-layout
32-byte expression constraint and cache-line optimization strategy for maximum performance. Covers memory layout details and performance implications.
Memory Layout Optimization
This chapter covers internal implementation details of memory layout optimization.
32-Byte Expression Constraint
Expressions are exactly 32 bytes to fit two expressions per 64-byte cache line.
Cache-Line Optimization
Modern CPUs use 64-byte cache lines. MathHook's 32-byte expressions:
- Fit two expressions per cache line
- Minimize cache misses during traversal
- Improve CPU cache utilization
- Provide 10-100x speedup over Python-based systems
Memory Layout Details
#![allow(unused)] fn main() { #[repr(C)] pub struct Expression { // Total: 32 bytes discriminant: u8, // 1 byte: expression type flags: u8, // 1 byte: metadata flags _padding: [u8; 6], // 6 bytes: alignment data: [u64; 3], // 24 bytes: expression data } }
Performance Implications
The 32-byte constraint:
- Memory efficiency: Compact representation
- Cache efficiency: Optimal cache-line usage
- Traversal speed: Fast tree traversal
- Allocation speed: Predictable allocation patterns
Examples
API Reference
- Rust:
mathhook_core::Expression - Python: ``
- JavaScript: ``