读取器/写入器有性能开销，因为它们旨在用于字符流，且会在后台将数据编码为字节。

There is a performance overhead involved with readers/writers because they are intended for character streams, and they encode data to bytes under the covers.

youdao

将一个点表示成ST _ point值会增加一些开销，但是我们谈论时仍然当作是几个字节。

Representing a point as an ST_Point value adds some overhead, but still we are only talking about a few bytes.

youdao

尽管如此，最小16字节至少是任何需要8字节对齐，存在malloc薄记开销的系统的一个特性。

However, the 16 bytes minimum at least is characteristic of any system requiring 8-byte alignment in which there is any malloc bookkeeping overhead.

youdao