b——采样期间在虚拟内存中等待队列的平均内核线程数。
B — the average number of kernel threads that are in the virtual memory waiting queue over your sampling interval.
为了保持控制系统的正常工作，传感器的采样与控制必须按照一定的周期间隔。
For the control system to work, sensor sampling and control must be performed at periodic intervals.
r——在所选择的任意采样间隔期间的平均可运行内核线程数。
R — The average number of runnable kernel threads over whatever sampling interval you have chosen.
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