因为最小块大小是16字节，那么只分配链表节点的用户程序就会遭受额外的100%的开销。
Since the minimum chunk size is 16 bytes, user programs allocating only list nodes suffer 100% overhead.
这意味着堆的实际大小可能比用户程序的最大堆驻留空间要大几倍。
This means that the actual size of the heap may be several times bigger than the maximum heap residency of the user program.
这样用户需要下载的程序大小就会显著减少。
This will dramatically reduce the size of the application which the user would now need to download.
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