使用vmstat监控系统负载
环境：
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[Oracle@simpleit ~]$ uname -a Linux simpleit.domain.cn 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:35 EDT 2010 i686 athlon i386 GNU/Linux [oracle@simpleit ~]$ cat /etc/RedHat-release CentOS release 5.5 (Final)
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[oracle@simpleit ~]$ vmstat 5 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 0 346220 28848 493544 0 0 109 55 1014 155 0 1 98 1 0 0 0 0 346220 28848 493544 0 0 0 21 698 93 0 0 100 0 0 0 0 0 346220 28856 493544 0 0 0 48 703 102 0 0 100 0 0 0 0 0 346220 28856 493544 0 0 0 21 693 94 0 0 100 0 0 0 0 0 346220 28860 493544 0 0 0 30 701 95 0 0 100 0 0 DESCRIPTION vmstat reports information about processes, memory, paging, block IO, traps, and cpu activ-ity. FIELD DESCRIPTION FOR VM MODE 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, included in idle. st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.