这个基准测试框架首先将所有文档读入内存缓冲区，然后对针对文档的输入和输出操作的多次传递进行计时。

This benchmark framework first reads all documents into internal memory buffers, then times multiple passes of input and output operations on the documents.

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也就是说，框架将合适的字段数据成员用作缓冲区，在该缓冲区中存储记录列的内容。

That is, the framework USES the appropriate field data member as a buffer in which to store the contents of a record column.

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当辅助线程完成一个框架后，UI 线程添加更改的矩形并取消锁定缓冲区。

When the worker thread has finished a frame, the UI thread adds changed rectangles and unlocks the buffer.

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