此篇完全參考[1] 的說明做整理
一、free
# free -h
total used free shared buff/cache available
Mem: 5.7G 302M 245M 350M 5.1G 4.6G
Swap: 2.0G 28M 2.0G
total used free shared buff/cache available
Mem: 5.7G 302M 245M 350M 5.1G 4.6G
Swap: 2.0G 28M 2.0G
二、cat /proc/meminfo
# cat /proc/meminfo
MemTotal: 5946568 kB
MemFree: 245052 kB
MemAvailable: 4849768 kB
Buffers: 0 kB
Cached: 4793488 kB
SwapCached: 1996 kB
Active: 2667892 kB
Inactive: 2243620 kB
Active(anon): 196404 kB
Inactive(anon): 281016 kB
Active(file): 2471488 kB
Inactive(file): 1962604 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 2097148 kB
...
MemTotal: 5946568 kB
MemFree: 245052 kB
MemAvailable: 4849768 kB
Buffers: 0 kB
Cached: 4793488 kB
SwapCached: 1996 kB
Active: 2667892 kB
Inactive: 2243620 kB
Active(anon): 196404 kB
Inactive(anon): 281016 kB
Active(file): 2471488 kB
Inactive(file): 1962604 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 2097148 kB
...
三、vmstat -s
# vmstat -s
5946568 K total memory
297644 K used memory
2652552 K active memory
2243688 K inactive memory
263648 K free memory
0 K buffer memory
5385276 K swap cache
2097148 K total swap
29156 K used swap
2067992 K free swap
12862316 non-nice user cpu ticks
106196 nice user cpu ticks
3709876 system cpu ticks
997861015 idle cpu ticks
1317075 IO-wait cpu ticks
...
5946568 K total memory
297644 K used memory
2652552 K active memory
2243688 K inactive memory
263648 K free memory
0 K buffer memory
5385276 K swap cache
2097148 K total swap
29156 K used swap
2067992 K free swap
12862316 non-nice user cpu ticks
106196 nice user cpu ticks
3709876 system cpu ticks
997861015 idle cpu ticks
1317075 IO-wait cpu ticks
...
四、top
# top
top - 09:53:16 up 39 days, 14:38, 1 user, load average: 0.15, 0.11, 0.06
Tasks: 132 total, 1 running, 131 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.6 us, 0.2 sy, 0.0 ni, 97.8 id, 0.3 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 5946568 total, 256764 free, 304424 used, 5385380 buff/cache
KiB Swap: 2097148 total, 2067992 free, 29156 used. 4862232 avail Mem
top - 09:53:16 up 39 days, 14:38, 1 user, load average: 0.15, 0.11, 0.06
Tasks: 132 total, 1 running, 131 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.6 us, 0.2 sy, 0.0 ni, 97.8 id, 0.3 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 5946568 total, 256764 free, 304424 used, 5385380 buff/cache
KiB Swap: 2097148 total, 2067992 free, 29156 used. 4862232 avail Mem
五、htop 可以查看使用比率(推薦)
htop 非原生，要安裝，在epel包中。
# yum install htop
# htop
六、dmidecode -t 17 查看每一個slot的狀況
# dmidecode -t 17
# dmidecode 3.0 <== 非指令
Scanning /dev/mem for entry point.
SMBIOS 2.4 present.
Handle 0x00E3, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x00E2
Error Information Handle: No Error
Total Width: 32 bits
Data Width: 32 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: RAM slot #0 <== 記憶體slot
Bank Locator: RAM slot #0
Type: DRAM
Type Detail: EDO
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
# dmidecode 3.0 <== 非指令
Scanning /dev/mem for entry point.
SMBIOS 2.4 present.
Handle 0x00E3, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x00E2
Error Information Handle: No Error
Total Width: 32 bits
Data Width: 32 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: RAM slot #0 <== 記憶體slot
Bank Locator: RAM slot #0
Type: DRAM
Type Detail: EDO
Speed: Unknown
Manufacturer: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
參考資料
[1] https://www.binarytides.com/linux-command-check-memory-usage/