C malloc implementations typically don't allocate the precise amount of memory requested but instead consume fixed-size runs of memory, e.g. with power-of-two sizes, so that an allocation of 1025 bytes actually takes a 2048-byte segment with 1023 bytes lost as slop. implementations typically don't alloca
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Java数组在HotSpot中使用内存的准确程度（即多少slop）？
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