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[系統(tǒng)管理] top和free內(nèi)存顯示不一致問題 [復(fù)制鏈接]

linewer

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發(fā)表于 2013-12-03 10:46 |只看該作者 |倒序瀏覽

系統(tǒng)CentOS6,物理內(nèi)存8g
free結(jié)果如下:
                  total    used    free    shared buffers    cached
Mem:       7812    7668       144       0       25    1477
-/+ buffers/cache: 6166    1646
Swap:       55167       22    55145
顯示實際使用6g+,  剩余1.6g+.

而top顯示

top - 14:55:18 up 70 days, 36 min, 1 user, load average: 0.02, 0.15, 0.45
Tasks: 182 total, 1 running, 181 sleeping, 0 stopped, 0 zombie
Cpu(s): 2.2%us, 1.6%sy, 0.2%ni, 91.0%id, 4.7%wa, 0.0%hi, 0.3%si, 0.0%st
Mem: 8000236k total, 7858992k used, 141244k free, 25644k buffers
Swap: 56492024k total, 23372k used, 56468652k free, 1509000k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2402 root 20 0 3923g 1.2g 1.1g S 2.0 15.9 5442:18 mong
8591 root 20 0 3630m 390m 13m S 0.0 5.0 0:15.64 java
12619 root 20 0 183m 12m 840 S 0.0 0.2 115:53.87 zmsg
12624 root 20 0 183m 12m 840 S 0.0 0.2 115:57.89 zmsg
12616 root 20 0 181m 12m 832 S 0.0 0.2 116:18.82 zmsg
12622 root 20 0 180m 11m 840 S 0.0 0.2 116:14.87 zmsg
12613 root 20 0 180m 11m 836 S 0.0 0.2 115:53.15 zmsg
2850 apache 20 0 233m 8028 2756 S 0.0 0.1 0:03.36 httpd
2822 apache 20 0 233m 7700 2704 S 0.0 0.1 0:03.26 httpd
2899 apache 20 0 233m 7636 2704 S 0.0 0.1 0:03.24 httpd
1856 root 20 0 231m 7632 3396 S 0.0 0.1 2:00.80 httpd
31505 apache 20 0 233m 7628 2704 S 0.0 0.1 0:04.84 httpd
2818 apache 20 0 232m 7536 2732 S 0.0 0.1 0:03.32 httpd
2838 apache 20 0 232m 7520 2728 S 0.0 0.1 0:03.07 httpd
2842 apache 20 0 232m 7516 2720 S 0.0 0.1 0:03.11 httpd
2903 apache 20 0 232m 7512 2720 S 0.0 0.1 0:03.43 httpd
2825 apache 20 0 232m 7508 2720 S 0.0 0.1 0:03.33 httpd
2477 apache 20 0 232m 7504 2712 S 0.0 0.1 0:03.32 httpd
2851 apache 20 0 232m 7504 2704 S 0.0 0.1 0:03.21 httpd
2813 apache 20 0 232m 7496 2704 S 0.0 0.1 0:03.37 httpd
2884 apache 20 0 232m 7492 2700 S 0.0 0.1 0:03.31 httpd
2908 apache 20 0 232m 7492 2720 S 0.0 0.1 0:03.23 httpd
2815 apache 20 0 232m 7488 2732 S 0.0 0.1 0:03.29 httpd
2840 apache 20 0 232m 7488 2732 S 0.0 0.1 0:03.55 httpd
2900 apache 20 0 232m 7488 2704 S 0.0 0.1 0:03.34 httpd
2820 apache 20 0 232m 7484 2704 S 0.0 0.1 0:03.38 httpd
2845 apache 20 0 232m 7484 2712 S 0.0 0.1 0:03.32 httpd
2911 apache 20 0 232m 7484 2716 S 0.0 0.1 0:03.38 httpd
31502 apache 20 0 232m 7480 2716 S 0.0 0.1 0:04.95 httpd
2844 apache 20 0 232m 7472 2712 S 0.0 0.1 0:03.23 httpd
2902 apache 20 0 232m 7468 2704 S 0.0 0.1 0:03.50 httpd
2478 apache 20 0 232m 7460 2704 S 0.0 0.1 0:03.44 httpd
2788 apache 20 0 232m 7456 2704 S 0.0 0.1 0:03.34 httpd
2475 apache 20 0 232m 7452 2704 S 0.0 0.1 0:03.41 httpd
2910 apache 20 0 232m 7444 2704 S 0.0 0.1 0:03.43 httpd
2848 apache 20 0 232m 7436 2712 S 0.0 0.1 0:03.25 httpd
2817 apache 20 0 232m 7324 2720 S 0.0 0.1 0:03.21 httpd
2904 apache 20 0 232m 7320 2716 S 0.0 0.1 0:03.50 httpd
2897 apache 20 0 232m 7308 2704 S 0.0 0.1 0:03.33 httpd
2909 apache 20 0 232m 7308 2704 S 0.0 0.1 0:03.26 httpd
2880 apache 20 0 232m 7304 2700 S 0.0 0.1 0:03.22 httpd
....省略其他內(nèi)存占用少的用戶態(tài)進(jìn)程和內(nèi)核進(jìn)程

復(fù)制代碼

算了下RSS或者%MEM占用的不超過30%,也就是2.4g+, 加上用的少的用戶態(tài)進(jìn)程和內(nèi)核進(jìn)程以及頁表項占用的應(yīng)不會太多(對比別的機(jī)器)
而別的機(jī)器,free,top算下來兩者不會差太多，也就是幾百M左右;而這臺機(jī)器還有3.6g左右的內(nèi)存用的哪里去了？cache,buffer的話這個在free中是會計算在內(nèi)的.....