Linux查看物理内存信息

1. 查看内存大小

dmidecode|grep Size

输出

Runtime Size: 64 kB
ROM Size: 4608 kB
Installed Size: 1024 kB
Maximum Size: 1024 kB
Installed Size: 256 kB
Maximum Size: 256 kB
Installed Size: 8192 kB
Maximum Size: 8192 kB
        PSE (Page size extension)
        PSE-36 (36-bit page size extension)
Descriptor 7: POST memory resize
Size: No Module Installed
Size: 8192 MB
Range Size: 8 GB
Size: No Module Installed
Size: 8192 MB
Range Size: 8 GB
Range Size: 16 GB

看里面有两个Size的，有两条，一共16G

2. 查看内存速率

dmidecode|grep Speed

输出

Nominal Speed: Unknown Or Non-rotating
Nominal Speed: Unknown Or Non-rotating
Nominal Speed: Unknown Or Non-rotating
Speed: Unknown
Speed: Unknown
Speed: Unknown
Max Speed: 3800 MHz
Current Speed: 3200 MHz
Speed: Unknown
Speed: 1600 MHz
Speed: Unknown
Speed: 1600 MHz

可以看到速率是1600MHz

3. 查看内存类型

dmidecode|grep DDR

输出

Type: DDR3
Type: DDR3

然而，在某些机器上可能没输出，则按照速率来判断。
内存速率和型号对应关系

DDR 266/333/400	
DDR2 533/667/800	
DDR3 1066/1333/1600

4. 查看ECC内存

ECC (error-correcting code) RAM is essential in servers and many workstations as it dramatically improves the reliability of the system's memory by detecting common kinds of data corruption and fixing the errors automatically. Without the error correction of ECC memory, memory errors can cause data corruption or even blue screens.
命令

dmidecode -t memory

输出

Handle 0x003D, DMI type 17, 27 bytes
Memory Device
        Array Handle: 0x003B
        Error Information Handle: Not Provided
        Total Width: 72 bits
        Data Width: 64 bits
        Size: 2048 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM_A1
        Bank Locator: NODE 0 CHANNEL 0 DIMM 0
        Type: Other
        Type Detail: Synchronous
        Speed: 1067 MHz
        Manufacturer: 0x80CE
        Serial Number: 0x875802AD
        Asset Tag: Unknown
        Part Number: M393B5673FH0-CH9

注意，如果信息包含Error Information Handle: Not Provided，Total Width: 72 bits， Data Width: 64 bits则表明ecc是启动的。