想象一下餐厅后厨。平台线程就像厨师，每个厨师都有自己的灶台、案板、锅铲（对应线程的栈空间、上下文）。招聘一个厨师成本很高，要给工资、买设备、安排工位，所以后厨一般就养十几个厨师，再多就养不起了（内存开销大）。
If a program successfully calls the ALLOC function twice, it will often own two adjacent memory blocks. If it then calls DEALLOC on each block, there will be two adjacent free memory blocks. When allocating memory again, these free blocks somehow need to be coalesced so that the free memory wouldn’t become endlessly fragmented.
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Even after building the trillion-dollar tech giant, Apple’s Steve Jobs never pretended to have all the answers. He stayed, as his former design chief put it, genuinely open to learning from other people right up to the end.
Publication date: 28 February 2026
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