Every byte matters

▤ Summary

This article explains how memory layout affects performance in Java and other software systems. It shows why cache lines, working set size, and data access patterns can dramatically change runtime behavior. It compares array-of-structs and struct-of-arrays layouts to demonstrate how packing data differently can reduce cache misses. It also shows that random access patterns and larger structs push data into slower cache tiers, creating measurable slowdowns. The main takeaway is that careful control of structure size and memory layout can unlock large performance gains.

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