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I’ve read that the ideal size of a structure for performance, that’s going to be used in a large collection, is 32 bytes. Is this true and why? Does this effect 64bit processors or is it not applicable?
This is in context of modern (2008+) home Intel-based systems.
The ideal size of a structure is likely to be one cache line (or a sub-multiple thereof). Level one cache lines are typically 32 or 64 bytes. Splitting an element of a data structure across a cache line boundary will require two main memory accesses to read or write it instead of one.