Memory Layout — Alignment, Padding, and False Sharing
Understand struct alignment and padding, how field ordering changes size and cache density, and how false sharing turns independent atomics into a contended hotspot.
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What this chapter teaches
Struct size is the sum of its fields, and field order is cosmetic.
alignment rules insert padding, so field order changes unsafe.Sizeof with zero behavioral change; and two unrelated fields sharing a cache line can silently destroy parallel scaling (false sharing).
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