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系统CentOS6,物理内存8g
free结果如下:
total used free shared buffers cached
Mem: 7812 7668 144 0 25 1477
-/+ buffers/cache: 6166 1646
Swap: 55167 22 55145
显示实际使用6g+, 剩余1.6g+.
而top显示- 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
- ....省略其他内存占用少的用户态进程和内核进程
复制代码 算了下RSS或者%MEM占用的不超过30%,也就是2.4g+, 加上用的少的用户态进程和内核进程以及页表项占用的应不会太多(对比别的机器)
而别的机器,free,top算下来两者不会差太多,也就是几百M左右;而这台机器还有3.6g左右的内存用的哪里去了?cache,buffer的话这个在free中是会计算在内的.....
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