在询问我的问题之前，我已经搜索了很多次。我有 6gb RAM，目前使用了 4 个，空闲了 2 个，缓冲区很低
# free -m
total used free shared buffers cached
Mem: 5982 4031 1951 0 2 16
-/+ buffers/cache: 4011 1971
Swap:
1023 3 1020
但是我的 ps 说没有进程正在占用这个内存...
# ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 19332 712 ? Ss Jul01 0:03 /sbin/init
root 2 0.0 0.0 0 0 ? S Jul01 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Jul01 0:09 [migration/0]
root 4 0.0 0.0 0 0 ? S Jul01 0:05 [ksoftirqd/0]
root 5 0.0 0.0 0 0 ? S Jul01 0:00 [migration/0]
root 6 0.0 0.0 0 0 ? S Jul01 0:28 [watchdog/0]
root 7 0.0 0.0 0 0 ? S Jul01 0:02 [migration/1]
root 8 0.0 0.0 0 0 ? S Jul01 0:00 [migration/1]
root 9 0.0 0.0 0 0 ? S Jul01 0:03 [ksoftirqd/1]
root 10 0.0 0.0 0 0 ? S Jul01 0:15 [watchdog/1]
root 11 0.0 0.0 0 0 ? S Jul01 0:57 [events/0]
root 12 0.0 0.0 0 0 ? S Jul01 1:07 [events/1]
root 13 0.0 0.0 0 0 ? S Jul01 0:00 [cgroup]
root 14 0.0 0.0 0 0 ? S Jul01 0:00 [khelper]
root 15 0.0 0.0 0 0 ? S Jul01 0:00 [netns]
root 16 0.0 0.0 0 0 ? S Jul01 0:00 [async/mgr]
root 17 0.0 0.0 0 0 ? S Jul01 0:00 [pm]
root 18 0.0 0.0 0 0 ? S Jul01 0:03 [sync_supers]
root 19 0.0 0.0 0 0 ? S Jul01 0:05 [bdi-default]
root 20 0.0 0.0 0 0 ? S Jul01 0:00 [kintegrityd/0]
root 21 0.0 0.0 0 0 ? S Jul01 0:00 [kintegrityd/1]
root 22 0.0 0.0 0 0 ? S Jul01 1:33 [kblockd/0]
root 23 0.0 0.0 0 0 ? S Jul01 1:25 [kblockd/1]
root 24 0.0 0.0 0 0 ? S Jul01 0:00 [kacpid]
root 25 0.0 0.0 0 0 ? S Jul01 0:00 [kacpi_notify]
root 26 0.0 0.0 0 0 ? S Jul01 0:00 [kacpi_hotplug]
root 27 0.0 0.0 0 0 ? S Jul01 0:00 [ata/0]
root 28 0.0 0.0 0 0 ? S Jul01 0:00 [ata/1]
root 29 0.0 0.0 0 0 ? S Jul01 0:00 [ata_aux]
root 30 0.0 0.0 0 0 ? S Jul01 0:00 [ksuspend_usbd]
root 31 0.0 0.0 0 0 ? S Jul01 0:00 [khubd]
root 32 0.0 0.0 0 0 ? S Jul01 0:00 [kseriod]
root 33 0.0 0.0 0 0 ? S Jul01 0:00 [md/0]
root 34 0.0 0.0 0 0 ? S Jul01 0:00 [md/1]
root 35 0.0 0.0 0 0 ? S Jul01 0:00 [md_misc/0]
root 36 0.0 0.0 0 0 ? S Jul01 0:00 [md_misc/1]
root 37 0.0 0.0 0 0 ? S Jul01 0:00 [khungtaskd]
root 38 0.2 0.0 0 0 ? S Jul01 6:02 [kswapd0]
root 39 0.0 0.0 0 0 ? SN Jul01 0:00 [ksmd]
root 40 0.0 0.0 0 0 ? SN Jul01 2:43 [khugepaged]
root 41 0.0 0.0 0 0 ? S Jul01 0:00 [aio/0]
root 42 0.0 0.0 0 0 ? S Jul01 0:00 [aio/1]
root 43 0.0 0.0 0 0 ? S Jul01 0:00 [crypto/0]
root 44 0.0 0.0 0 0 ? S Jul01 0:00 [crypto/1]
root 49 0.0 0.0 0 0 ? S Jul01 0:00 [kthrotld/0]
root 50 0.0 0.0 0 0 ? S Jul01 0:00 [kthrotld/1]
root 51 0.0 0.0 0 0 ? S Jul01 0:00 [pciehpd]
root 53 0.0 0.0 0 0 ? S Jul01 0:00 [kpsmoused]
root 54 0.0 0.0 0 0 ? S Jul01 0:00 [usbhid_resumer]
root 85 0.0 0.0 0 0 ? S Jul01 0:00 [kstriped]
root 234 0.0 0.0 0 0 ? S Jul01 0:00 [scsi_eh_0]
root 235 0.0 0.0 0 0 ? S Jul01 0:00 [scsi_eh_1]
root 243 0.0 0.0 0 0 ? S Jul01 0:12 [mpt_poll_0]
root 244 0.0 0.0 0 0 ? S Jul01 0:00 [mpt/0]
root 245 0.0 0.0 0 0 ? S Jul01 0:00 [scsi_eh_2]
root 309 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 310 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 330 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-0-8]
root 331 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 332 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 677 0.0 0.0 0 0 ? S Jul01 2:24 [vmmemctl]
root 794 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 797 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 798 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 801 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 806 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 813 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 819 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 828 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 837 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 843 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 849 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 854 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 858 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 860 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 868 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 915 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 917 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 919 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 926 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 933 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 936 0.0 0.0 0 0 ? S Jul01 0:00 [kdmflush]
root 1009 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/sda1-8]
root 1010 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1011 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1012 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-21-8]
root 1013 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1014 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1015 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-2-8]
root 1016 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1017 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1018 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-18-8]
root 1019 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1020 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1021 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-22-8]
root 1022 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1023 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1024 0.0 0.0 0 0 ? S Jul01 0:45 [jbd2/dm-19-8]
root 1025 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1026 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1027 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-17-8]
root 1028 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1029 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1030 0.0 0.0 0 0 ? S Jul01 0:08 [jbd2/dm-20-8]
root 1031 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1032 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1033 0.0 0.0 0 0 ? S Jul01 0:08 [jbd2/dm-3-8]
root 1034 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1035 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1036 0.0 0.0 0 0 ? S Jul01 0:03 [jbd2/dm-4-8]
root 1037 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1038 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1039 0.0 0.0 0 0 ? S Jul01 0:02 [jbd2/dm-5-8]
root 1040 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1041 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1042 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-6-8]
root 1043 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1044 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1045 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-7-8]
root 1046 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1047 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1048 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-8-8]
root 1049 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1050 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1051 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-9-8]
root 1052 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1053 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1054 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-10-8]
root 1055 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1056 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1057 0.0 0.0 0 0 ? S Jul01 0:23 [jbd2/dm-11-8]
root 1058 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1059 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1060 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-12-8]
root 1061 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1062 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1063 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-13-8]
root 1064 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1065 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1066 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-14-8]
root 1067 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1068 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1069 0.0 0.0 0 0 ? S Jul01 0:01 [jbd2/dm-15-8]
root 1070 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1071 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1072 0.0 0.0 0 0 ? S Jul01 0:00 [jbd2/dm-16-8]
root 1073 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1074 0.0 0.0 0 0 ? S Jul01 0:00 [ext4-dio-unwrit]
root 1134 0.0 0.0 0 0 ? S Jul01 0:00 [kauditd]
root 1538 0.0 0.0 248708 800 ? Sl Jul01 0:09 /sbin/rsyslogd -i /var/run/syslogd.pid -c 4
root 1559 0.0 0.0 64032 456 ? Ss Jul01 0:00 /usr/sbin/sshd
root 1607 0.0 0.0 117180 412 ? Ss Jul01 0:09 crond
root 1879 0.0 0.0 4048 204 tty2 Ss+ Jul01 0:00 /sbin/mingetty /dev/tty2
root 1881 0.0 0.0 4048 204 tty3 Ss+ Jul01 0:00 /sbin/mingetty /dev/tty3
root 1883 0.0 0.0 4048 204 tty4 Ss+ Jul01 0:00 /sbin/mingetty /dev/tty4
root 1886 0.0 0.0 4048 204 tty5 Ss+ Jul01 0:00 /sbin/mingetty /dev/tty5
root 1891 0.0 0.0 4048 204 tty6 Ss+ Jul01 0:00 /sbin/mingetty /dev/tty6
root 7598 0.0 0.0 97732 3816 ? Ss 08:55 0:00 sshd: osadmin [priv]
osadmin 7603 0.0 0.0 97872 1956 ? S 08:55 0:00 sshd: osadmin@pts/0
osadmin 7604 0.0 0.0 108324 1824 pts/0 Ss 08:55 0:00 -bash
root 8883 0.0 0.0 0 0 ? S 09:50 0:00 [flush-253:20]
root 8885 0.0 0.0 149440 1692 pts/0 S 09:51 0:00 su - root
root 8887 0.1 0.0 108448 1904 pts/0 S 09:51 0:01 -bash
root 8913 0.0 0.0 4048 540 tty1 Ss+ 09:53 0:00 /sbin/mingetty /dev/tty1
root 8971 0.0 0.0 110228 1116 pts/0 R+ 10:03 0:00 ps aux
我不知道哪个进程消耗了这块内存。重启服务器可以解决每天几个小时的问题。
我已经测试过：
- 清洁缓冲液：
sync; echo 3 > /proc/sys/vm/drop_caches - 尽可能停止进程
答案1
您正在 VMware 虚拟机中运行，并且 VM 已启用内存膨胀。因此，虚拟机管理程序可以动态地从您的 VM 中“拿走”内存并允许其他 VM 使用它（因为您的 VM 未使用它）。对于 VMware，这会显示为无法解释的“已使用”内存。