在我们的 RHEVM 服务器上，当我运行 free -m 命令时，它告诉我们 23117MB“已用 -（缓冲区+缓存）”RAM 正在使用中，而空闲“空闲+（缓冲区+缓存）”为 9120MB
总可用 RAM 为 30759MB 实际已用 23117MB 实际可用 9120MB
当我试图找到一个消耗 RAM 的进程时，它是 POSTMASTER 进程，但它仍然只使用 1288MB
这是顶级进程的列表
1288MB postmaster
859MB java
449MB udisks-daemon
355MB gnome-settings-
232MB firefox
133MB httpd
132MB gpk-update-icon
58MB gdu-notificatio
55MB gvfs-gdu-volume
42MB python
38MB nautilus
29MB Xorg
24MB Xvnc
24MB clock-applet
19MB sshd
13MB gnome-panel
13MB metacity
12MB mdmon
12MB gnome-session
12MB wnck-applet
11MB gnome-volume-co
11MB ovirt-engine.py
11MB gdm-user-switch
10MB notification-da
并从 TOP 命令输出
Tasks: 371 total, 1 running, 370 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.7%us, 0.3%sy, 0.0%ni, 98.7%id, 0.2%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32853828k total, 31500888k used, 1352940k free, 208496k buffers
Swap: 16777208k total, 561144k used, 16216064k free, 7620628k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2780 ovirt 20 0 5924m 858m 21m S 2.7 2.7 4:58.50 java
130 root 39 19 0 0 0 S 1.0 0.0 10704:56 kipmi0
472 root 20 0 0 0 0 S 0.3 0.0 3533:58 md126_raid1
1778 root 20 0 0 0 0 S 0.3 0.0 288:47.88 kondemand/1
2992 postgres 20 0 270m 62m 11m S 0.3 0.2 0:19.17 postmaster
2993 postgres 20 0 269m 62m 11m S 0.3 0.2 0:19.27 postmaster
2994 postgres 20 0 271m 65m 11m S 0.3 0.2 0:19.38 postmaster
2996 postgres 20 0 270m 63m 11m S 0.3 0.2 0:19.16 postmaster
3042 postgres 20 0 272m 63m 11m S 0.3 0.2 0:19.27 postmaster
3043 postgres 20 0 270m 66m 11m S 0.3 0.2 0:18.88 postmaster
3056 postgres 20 0 269m 60m 11m S 0.3 0.2 0:18.96 postmaster
3057 postgres 20 0 269m 62m 11m S 0.3 0.2 0:18.85 postmaster
3058 postgres 20 0 270m 64m 11m S 0.3 0.2 0:19.00 postmaster
3062 postgres 20 0 272m 63m 11m S 0.3 0.2 0:18.96 postmaster
4744 root 20 0 15280 1472 948 R 0.3 0.0 0:00.02 top
1 root 20 0 19364 1224 1016 S 0.0 0.0 0:13.54 init
2 root 20 0 0 0 0 S 0.0 0.0 0:07.08 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:57.27 migration/0
4 root 20 0 0 0 0 S 0.0 0.0 4:43.07 ksoftirqd/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
6 root RT 0 0 0 0 S 0.0 0.0 0:49.55 watchdog/0
7 root RT 0 0 0 0 S 0.0 0.0 0:55.62 migration/1
8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
9 root 20 0 0 0 0 S 0.0 0.0 14:32.43 ksoftirqd/1
10 root RT 0 0 0 0 S 0.0 0.0 0:41.13 watchdog/1
11 root RT 0 0 0 0 S 0.0 0.0 0:41.82 migration/2
12 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/2
13 root 20 0 0 0 0 S 0.0 0.0 4:40.52 ksoftirqd/2
自由命令输出
total used free shared buffers cached
Mem: 32083 30999 1084 0 204 7665
-/+ buffers/cache: 23129 8954
Swap: 16383 547 15836
23117MB RAM 有何用途
答案1
一些 RAM 可能被 tmpfs 或其他与内核相关的东西（例如 ZFS）使用。
df -h并cat /proc/meminfo可能有助于解决这个问题。