linux怎么查看内存型号

因为网站开发的需求，需要对单位的服务器内存进行升级。那么在linux中怎么查看内存型号呢?下面跟着我一起来了解一下吧。

linux怎么查看内存型号

机器主板是nVidia Corporation MCP61，系统内存支持双通道内存技术。

配置了4个DDRII DIMM插槽，支持DDRII 800/667/533内存，最大支持8G容量。

为了尝试下双通道内存技术，准备加一条与原来完全一样的内存条。

电脑配置上只写了kingston DDRII512M。

接下来就要用工具dmidecode(DMI table decoder)确定下内存频率了。

dmidecode命令可以全面的显示你系统的信息，包括bios、 cpu 、内存等信息。

例如：

[root@localhost testcase]$ sudo dmidecode --help

Usage: dmidecode [OPTIONS]

Options are:

-d, --dev-mem FILE Read memory from device FILE (default: /dev/mem)

-h, --help Display this help text and exit

-q, --quiet Less verbose output

-s, --string KEYWORD Only display the value of the given DMI string

-t, --type TYPE Only display the entries of given type

-u, --dump Do not decode the entries

-V, --version Display the version and exit

[root@localhost testcase]$ sudo dmidecode -t memory

# dmidecode 2.7

SM BIOS 2.4 present.

Handle 0x0007, DMI type 5, 24 bytes.

Memory Controller Information

Error Detecting Method: 64-bit ECC

Error Correcting Capabilities:

None

Supported Interleave: One-way Interleave

Current Interleave: One-way Interleave

Maximum Memory Module Size: 2048 MB

Maximum Total Memory Size: 8192 MB

Supported Speeds:

70 ns

60 ns

Supported Memory Types:

DIMM

SDRAM

Memory Module Voltage: 3.3 V

Associated Memory Slots: 4

0x0008

0x0009

0x000A

0x000B

Enabled Error Correcting Capabilities:

None

Handle 0x0008, DMI type 6, 12 bytes.

Memory Module Information

Socket Designation: DIMM0

Bank Connections: 0 1

Current Speed: Unknown

Type: ECC DIMM

Installed Size: 512 MB (Single-bank Connection)

Enabled Size: 512 MB (Single-bank Connection)

Error Status: OK

Handle 0x0009, DMI type 6, 12 bytes.

Memory Module Information

Socket Designation: DIMM1

Bank Connections: None

Current Speed: Unknown

Type: Unknown

Installed Size: Not Installed

Enabled Size: Not Installed

Error Status: OK

Handle 0x000A, DMI type 6, 12 bytes.

Memory Module Information

Socket Designation: DIMM2

Bank Connections: None

Current Speed: Unknown

Type: Unknown

Installed Size: Not Installed

Enabled Size: Not Installed

Error Status: OK

Handle 0x000B, DMI type 6, 12 bytes.

Memory Module Information

Socket Designation: DIMM3

Bank Connections: None

Current Speed: Unknown

Type: Unknown

Installed Size: Not Installed

Enabled Size: Not Installed

Error Status: OK

Handle 0x0010, DMI type 16, 15 bytes.

Physical Memory Arroot

Location: System Board Or Motherboard

Use: System Memory

Error Correction Type: None

Maximum Capacity: 8 GB

Error Information Handle: Not Provided

Number Of Devices: 4

Handle 0x0012, DMI type 17, 27 bytes.

Memory Device

Arroot Handle: 0x0010

Error Information Handle: Not Provided

Total Width: 64 bits

Data Width: 72 bits

Size: 512 MB

Form Factor: DIMM

Set: None

Locator: DIMM0

Bank Locator: BANK0

Type: DDR2

Type Detail: Synchronous

Speed: 533 MHz (1.9 ns)

Manufacturer: Manufacturer0

Serial Number: SerNum0

Asset Tag: AssetTagNum0

Part Number: PartNum0

Handle 0x0014, DMI type 17, 27 bytes.

Memory Device

Arroot Handle: 0x0010

Error Information Handle: Not Provided

Total Width: Unknown

Data Width: 64 bits

Size: No Module Installed

Form Factor: DIMM

Set: None

Locator: DIMM1

Bank Locator: BANK1

Type: Unknown

Type Detail: Unknown

Speed: Unknown

Manufacturer: Manufacturer1

Serial Number: SerNum1

Asset Tag: AssetTagNum1

Part Number: PartNum1

Handle 0x0016, DMI type 17, 27 bytes.

Memory Device

Arroot Handle: 0x0010

Error Information Handle: Not Provided

Total Width: Unknown

Data Width: 64 bits

Size: No Module Installed

Form Factor: DIMM

Set: None

Locator: DIMM2

Bank Locator: BANK2

Type: Unknown

Type Detail: Unknown

Speed: Unknown

Manufacturer: Manufacturer2

Serial Number: SerNum2

Asset Tag: AssetTagNum2

Part Number: PartNum2

Handle 0x0018, DMI type 17, 27 bytes.

Memory Device

Arroot Handle: 0x0010

Error Information Handle: Not Provided

Total Width: Unknown

Data Width: 64 bits

Size: No Module Installed

Form Factor: DIMM

Set: None

Locator: DIMM3

Bank Locator: BANK3

Type: Unknown

Type Detail: Unknown

Speed: Unknown

Manufacturer: Manufacturer3

Serial Number: SerNum3

Asset Tag: AssetTagNum3

Part Number: PartNum3

总结 ：

在Memory Controller Information中，可以看到最大的内存大小是8G，支持内存种类为DIMM和SDRAM。有四个Memory Slots。对应接下来的4个Memory Module Information。

DMI type 16 (man dmidecode里面有DMI TYPES specification)的意思是 Physical Memory Arroot。

1. 查看cpu型号cat /proc/cpuinfo | grep "model name" | uniq 2. 查看cpu物理个数cat /proc/cpuinfo | grep "physical id" | uniq | wc -l3.使用PyCPUID模块import pycpuidprint "has SSE2:", pycpuid.HAS_SSE2print "all availabe features:", pycpuid.features()print pycpuid.vendor(1)print "brand string:", pycpuid.brand_string()4. 查看内存信息（显示插槽个数和每个插槽里内存条的大小）dmidecode -t memory | grep Size5. 查看内存条厂家dmidecode -t memory | grep Manufacturer

共享内存查看

使用ipcs命令，不加如何参数时，会把共享内存、信号量、消息队列的信息都打印出来，如果只想显示共享内存信息，使用如下命令：

[root@localhost ~]# ipcs -m

------ Shared Memory Segments --------

keyshmid owner perms bytes nattch status

0x00000000 1867776root 600393216 2 dest

0x00000000 1900545root 600393216 2 dest

0x00030021 1703938zc666131104 1

0x0003802e 1736707zc666131104 1

0x00030004 1769476zc666131104 1

0x00038002 1802245zc666131104 1

0x00000000 1933318root 600393216 2 dest

0x00000000 1966087root 600393216 2 dest

0x00000000 1998856root 600393216 2 dest

0x00000000 2031625root 600393216 2 dest

0x00000000 2064394root 600393216 2 dest

0x0014350c 2261003cs66633554432 2

0x00000000 2129932root 600393216 2 dest

0x00000000 2162701root 600393216 2 dest

0x00143511 395837454 root 66610485761

其中：

第一列就是共享内存的key；

第二列是共享内存的编号shmid；

第三列就是创建的用户owner；

第四列就是权限perms；

第五列为创建的大小bytes；

第六列为连接到共享内存的进程数nattach；

第七列是共享内存的状态status。其中显示“dest”表示共享内存段已经被删除，但是还有用户在使用它，当该段内存的mode字段设置为SHM_DEST时就会显示“dest”。当用户调用shmctl的IPC_RMID时，内存先查看多少个进程与这个内存关联着，如果关联数为0，就会销毁这段共享内存，否者设置这段内存的mod的mode位为SHM_DEST，如果所有进程都不用则删除这段共享内存。

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