linux内存管理命令

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linux

vmstat -s

与free -m 是比较好的观测内存的命令

刚进入运行的系统

-bash-3.2$ vmstat -s
     30897940 total memory
       184408 used memory
        78848 active memory
        67432 inactive memory
     30713532 free memory
         6356 buffer memory
       105176 swap cache
      4192956 total swap
            0 used swap
      4192956 free swap
          369 non-nice user cpu ticks
            0 nice user cpu ticks
          537 system cpu ticks
       120270 idle cpu ticks
         1523 IO-wait cpu ticks
            4 IRQ cpu ticks
           50 softirq cpu ticks
            0 stolen cpu ticks
       112896 pages paged in
         9724 pages paged out
            0 pages swapped in
            0 pages swapped out
       160886 interrupts
        71964 CPU context switches
   1350373112 boot time
         2821 forks

[root@localhost ~]# free -m
             total       used       free     shared    buffers     cached
Mem:         30173        179      29994          0          6        102
-/+ buffers/cache:         70      30103
Swap:         4094          0       4094

＝＝＝＝＝＝＝＝＝＝

运行很长时间，内存cach了很多

[root@localhost ssh]# vmstat -a 2
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b   swpd   free inact active   si   so    bi    bo   in   cs us sy id wa st
0 0      0 23590020 5347780 1614948    0    0     0     1    1    0 0 0 100 0 0
0 0      0 23590020 5347772 1615016    0    0     0     4 1006 306 0 0 100 0 0
0 0      0 23590020 5347772 1615012    0    0     0     0 1002 301 0 0 100 0 0
0 0      0 23589880 5347772 1615012    0    0     0    24 1017 384 0 0 100 0 0

root@localhost ssh]# vmstat -s
     30897940 total memory
      7302736 used memory
      1610636 active memory
      5346844 inactive memory
     23595204 free memory
       274844 buffer memory
      6102092 swap cache
      4192956 total swap
            0 used swap
      4192956 free swap
       558515 non-nice user cpu ticks
         1193 nice user cpu ticks
       585088 system cpu ticks
   2967723549 idle cpu ticks
       210472 IO-wait cpu ticks
         4406 IRQ cpu ticks
       301885 softirq cpu ticks
            0 stolen cpu ticks
       543204 pages paged in
     41063536 pages paged out
            0 pages swapped in
            0 pages swapped out
   3722943494 interrupts
    393601166 CPU context switches
   1346660283 boot time
      8934193 forks

[root@localhost ssh]# vmstat
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 23595204 274848 6102060    0    0     0     1    1    0 0 0 100 0 0

[root@localhost ssh]# free -m
             total       used       free     shared    buffers     cached
Mem:         30173       7131      23042          0        268       5958
-/+ buffers/cache:        904      29269
Swap:         4094          0       4094