How to explain the vmstat display result in linux

In linux, The vmstat display result explains vmstat www.2cto.com vmstat 1 5 procs ----------- memory ---------- --- swap -- ----- io ---- system -- ----- cpu ------ r B swpd free buff cache si so bi bo in cs us sy id wa st 0 0 3295108 158596 342284 19338704 0 0 15 1 1 0 0 99 0 0 # procsr: number of processes waiting for running B: Number of processes in sleep w: Number of processes that can be switched # memoryswap: virtual memory usage free: idle memory buff: memory Used as cache: memory used as cache www.2cto.com # swapsi: Number of swap seconds from swap interval to memory O: Number of switches from memory swap to swap interval # iobi: number of blocks sent to fast devices bo: number of blocks received by Block devices # systemin: Number of disconnections per second cs: number of Environment switches per second # cpu // The percentage of total cpu usage is displayed as us: Process execution time in use sy: system process execution time id: idle time wa: i/O wait time is generally r <5, B = 0 # if r is often greater than 3 or 4, and the id is often less than 50, it indicates that the cpu load is too large # For example, si and so are not equal to 0 for a long time, indicating that the memory is insufficient # disk is often not equal to 0, and the queue in B is greater than 2 or 3, indicates that io performance is poor. vmstat-a: displays active and inactive memory-f: displays the number of forks since the system was started. -M: Display slabinfo-n: The name of each field is displayed only once at the beginning. -S: displays memory-related statistics and the number of various system activities. Delay: refresh interval. If this parameter is not specified, only one result is displayed. Count: Number of refreshes. If you do not specify the number of refreshes, but specify the interval, the number of refreshes is infinite. -D: Displays disk statistics. -P: displays statistics of specified disk partitions.-S: displays statistics in a specified unit. Parameters include k, K, m, and M, representing 1000, 1024, 1000000,
1048576 bytes (byte ). The default unit is K (1024 bytes)-V: displays vmstat version information.