[Verse 1] When bytes collide in structures tight Your variables need breathing space A char beside an integer creates A gap that padding fills with grace The compiler adds those silent bytes To keep addresses clean and straight Your memory map starts fragmenting When alignment rules you underestimate [Chorus] Pack it tight, align it right Choose your types with crystal sight Eight byte boundaries for your doubles Four for ints to dodge the troubles Size matters when the cache is calling Padding wastes what speed needs most Memory footprint keeps on sprawling Till you optimize what matters most [Verse 2] A boolean eats a full byte slot Though one bit holds its truth complete Arrays of structures multiply The waste when layouts aren't discrete Reorder fields from large to small Let natural alignment guide your way A pointer then a char then short Leaves holes that make performance pay [Chorus] Pack it tight, align it right Choose your types with crystal sight Eight byte boundaries for your doubles Four for ints to dodge the troubles Size matters when the cache is calling Padding wastes what speed needs most Memory footprint keeps on sprawling Till you optimize what matters most [Bridge] Union overlays save precious space Bitfields compress when flags abound Pragma pack directive forces density But breaks the speed that alignment found [Verse 3] Cache lines load sixty-four at once Your scattered data kills the flow False sharing splits atomic ops Across the cores that need to grow Profile first then reorganize Hot fields clustered in one zone Cold data pushed to distant shores Where access patterns rarely roam [Chorus] Pack it tight, align it right Choose your types with crystal sight Eight byte boundaries for your doubles Four for ints to dodge the troubles Size matters when the cache is calling Padding wastes what speed needs most Memory footprint keeps on sprawling Till you optimize what matters most [Outro] Every byte counts in the race Between your code and silicon's pace
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