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.
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.
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.
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