Linux使用dmidecode来查看机器有几根内存插槽，哪个槽上有内存

直接输入dmidecode即可，输出有很多，好像是根据SM总线来查询的，包括能查询到BIOS的地址空间和其中的信息等等，内存信息只是其中的一部分。摘录如下：

Handle 0x001C
        DMI type 16, 15 bytes.
        Physical Memory Array
                Location: System Board Or Motherboard
                Use: System Memory
                Error Correction Type: None
                Maximum Capacity: 4 GB
                Error Information Handle: Not Provided
                Number Of Devices: 4
Handle 0x001D
        DMI type 17, 21 bytes.
        Memory Device
                Array Handle: 0x001C
                Error Information Handle: Not Provided
                Total Width: Unknown
                Data Width: Unknown
                Size: No Module Installed
                Form Factor: DIMM
                Set: None
                Locator: A0
                Bank Locator: Bank0/1
                Type: Unknown
                Type Detail: Unknown
Handle 0x001E
        DMI type 17, 21 bytes.
        Memory Device
                Array Handle: 0x001C
                Error Information Handle: Not Provided
                Total Width: Unknown
                Data Width: Unknown
                Size: No Module Installed
                Form Factor: DIMM
                Set: None
                Locator: A1
                Bank Locator: Bank2/3
                Type: Unknown
                Type Detail: Unknown
Handle 0x001F
        DMI type 17, 21 bytes.
        Memory Device
                Array Handle: 0x001C
                Error Information Handle: Not Provided
                Total Width: 64 bits
                Data Width: 64 bits
                Size: 512 MB
                Form Factor: DIMM
                Set: None
                Locator: A2
                Bank Locator: Bank4/5
                Type: SDRAM
                Type Detail: Synchronous
Handle 0x0020
        DMI type 17, 21 bytes.
        Memory Device
                Array Handle: 0x001C
                Error Information Handle: Not Provided
                Total Width: Unknown
                Data Width: Unknown
                Size: No Module Installed
                Form Factor: DIMM
                Set: None
                Locator: A3
                Bank Locator: Bank6/7
                Type: Unknown
                Type Detail: Unknown

 从这段输出可以看出，第一个Physical Memory Array是总体的内存信息，从这里可以看到有四个内存插槽、机器最大支持的内存总量等。然后下面开始就是每个内存插槽的情况，在这里可以看到，第三个内存插槽上插了一根512M的内存。 

更多的信息请参考dmidecode的手册。