Linux查看主板内存槽与内存信息

# dmidecode命令
dmidecode以一种可读的方式dump出机器的DMI(Desktop ManagementInterface)信息。这些信息包括了硬件以及BIOS，既可以得到当前的配置，也可以得到系统支持的最大配置。

DMI也叫SMBIOS(System ManagementBIOS)，这两个标准都由DMTF(Desktop Management Task Force)开发。

# 常用命令

1. 查看内存槽数、插内存的槽位及对应槽内存大小

```bash
dmidecode|grep -P -A5 "Memory\s+Device"|grep Size|grep -vRange
```

2. 查看最大支持内存数

```bash
dmidecode|grep -P 'Maximum\s+Capacity'
```

3. 查看槽位上内存的速率，unknown表示无内存条或该内存条无法识别

```bash
dmidecode|grep -A16 "Memory Device"|grep 'Speed'
```

4. 查看内存槽及内存条

```bash
dmidecode -t memory
```
 
5. 查看内存插槽数、已插槽数及单槽内存大小

```bash
dmidecode -t memory | grep Size
```

6. 查看服务器型号、序列号

```bash
dmidecode | grep "System Information" -A9 | egrep "Manufacturer|Product|Serial"
```

7. 只显示必要的信息（精简显示）

```BASH
dmidecode -q
```

8. 显示指定类型的信息(支持的数字对应参数，详见附录1)

```BASH
dmidecode -t0,4  //(显示bios和processor)
```

# 附录1：
 dmidecode支持的数字参数：
```
 Type  Information
   ----------------------------------------
        0   BIOS
        1   System
        2   BaseBoard
        3   Chassis
        4   Processor
        5   MemoryController
        6   MemoryModule
        7   Cache
        8   PortConnector
        9   SystemSlots
       10   On BoardDevices
       11   OEMStrings
       12   SystemConfiguration Options
       13   BIOSLanguage
       14   GroupAssociations
       15   System EventLog
       16   PhysicalMemory Array
       17   MemoryDevice
       18   32-bit MemoryError
       19   Memory ArrayMapped Address
       20   Memory DeviceMapped Address
       21   Built-inPointing Device
       22   PortableBattery
       23   SystemReset
       24   HardwareSecurity
       25   System PowerControls
       26   VoltageProbe
       27   CoolingDevice
       28   TemperatureProbe
       29   ElectricalCurrent Probe
       30   Out-of-bandRemote Access
       31   Boot IntegrityServices
       32   SystemBoot
       33   64-bit MemoryError
       34   ManagementDevice
       35   ManagementDevice Component
       36   ManagementDevice Threshold Data
       37   MemoryChannel
       38   IPMIDevice
       39   PowerSupply
```