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vmstat

  實時查看內存使用情況 vmstat 2(秒數) vmstat 5 40 vmstat 可用來紀錄 processes, memory, paging, block IO, traps, 與 cpu activity。 例如 $ vmstat 1 # 1 是更新速度,單位為秒 procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 549368 13316 102388 91992 12 6 9 8 2 12 72 3 25 0 2 0 549368 13316 102388 91992 0 0 0 0 156 1516 98 2 0 0 2 0 549368 13312 102388 91992 0 0 0 0 125 534 99 1 0 0 .... 第一列與第二列所代表是執行程式的資訊,接下來的是記憶體、swap、io、systm 與 cpu。 Procs r: The number of processes waiting for run time. b: The number of processes in uninterruptible sleep. Memory swpd: the amount of virtual memory used. free: the amount of idle memory. buff: the amount of memory used as buffers. cache: the amount of memory used as cache. inact: the amount of inactive memory. (-a option) active: the amount of active memory. (-a option) Swap si: Amount of memory swapped in from disk (/s). so: Amount of memory swapped to disk (/s). IO bi: Blocks received from a block device (blocks/s). bo: Blocks sent to a block device (blocks/s). System in: The number of interrupts per second, including the clock. cs: The number of context switches per second. CPU These are percentages of total CPU time. us: Time spent running non-kernel code. (user time, including nice time) sy: Time spent running kernel code. (system time) id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time. wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero.




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