可以在底部找到缓存中的空闲字节数。
The number of free bytes in the cache can be found at bottom.
endPoint记录最后一个内存块中第一个空闲字节的偏移位置。
The endPoint records the first free byte's offset location into the last memory block.
统计信息中包括总的内存利用百分比；全部、已使用的和空闲的内存字节数；以及一些不太重要的监控数据，包括请求、XG4和占用内存。
Statistics include a percentage of total memory utilized; bytes of total, used, and free memory; and of lesser interest in typical monitoring, request, XG4, and held memory.
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