After it had consumed around 100mb, there was a drastic jump in the values of PI and Po fields from vmstat output, which indicates increased paging activity.
当消耗的内存达到100 MB左右之后，vmstat输出中的pi和po字段值急剧增加，这说明分页活动增加了。
The page section in the output indicates current paging status of your system; pi column indicates number of pages read into the memory and po column indicates number of pages paged out of the memory.
输出的 page 部分指示系统的当前分页状态；pi 列指示读入内存的页数目，而 po 列则指示移出内存的页数目。
Pi-this column represents the pages paged in from the paging space.
pi—这一列表示从分页空间调入的页面数。
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