linux vmstat监控系统负载

linux vmstat监控系统负载

使用vmstat监控系统负载
环境：
 
[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)   
 
 
[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.   

摘自 Laughing