定制malloc用于许多小型固定大小的块？

I need to allocate, and free lots of fixed size, small (16 byte) blocks of memory, in no fixed order. I could just call malloc and free for each, but that will probably be very inefficient. A better solution probably would be to call malloc and free for larger blocks, and handle the allocation within those blocks itself.I need to allocate, and free lots of fixed size