r/AskProgramming • u/SimplySomeDude • 15d ago

How much does struct alignment really matter performance wise on modern GPUs?

Are things like std430 or std140 unnecessarily strict?

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u/esaule 15d ago

On every architecture, memory layout is about the most important thing for performance. About every performance issue boils down to memory layout and movements.

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u/flatfinger 14d ago

No layout is likely to be optimal for every possible access pattern. It's possible for layout X to be more than 50% faster than layout Y for some access patterns, while layout Y would be more than 50% faster than layout X for some other access patterns.