linux recommends a way to view the number of memory sticks and the size of each memory

On an linux system, you can view the number of memory sticks and the size of each memory, using the dmidecode command.

As follows:

#dmidecode | grep -A16 "Memory Device$"

Output results:

Memory Device # The storage device 
Array Handle: 0x1000 # Array processing 
Error Information Handle: Not Provided # Error message handling: not provided  
Total Width: 72 bits # The total width:  72 position 
Data Width: 64 bits # Data width:  64 position  
Size: 1024 MB # The size of the 
Form Factor: 
Set: 1
Locator: DIMM1 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous # Enter details: synchronization  
Speed: 667 MHz (1.5 ns) # Speed:  667 Megahertz (  1.5 Ns) 
Manufacturer: 80AD7FB380AD # manufacturers 
Serial Number: 42600700 # The serial number 
Asset Tag: 010910
Part Number: HYMP112F72CP8D3-Y5
--
//by www.ofstack.com
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: 
Set: 1
Locator: DIMM2 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: 80AD7FB380AD
Serial Number: 42600213
Asset Tag: 010910
Part Number: HYMP112F72CP8D3-Y5
--
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: 
Set: 2
Locator: DIMM3 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: 855185518551
Serial Number: 0503BE1A
Asset Tag: 4C0838
Part Number: 72T128401EFA3SC2 
--
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: 
Set: 2
Locator: DIMM4 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: 855185518551
Serial Number: 0503BF1F
Asset Tag: 4C0838
Part Number: 72T128401EFA3SC2 
--
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: 
Set: 3
Locator: DIMM5 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous
Speed: Unknown
Manufacturer: 
Serial Number: 
Asset Tag: 
Part Number: 
--
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: 
Set: 3
Locator: DIMM6 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous
Speed: Unknown
Manufacturer: 
Serial Number: 
Asset Tag: 
Part Number: 
--
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: 
Set: 4
Locator: DIMM7 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous
Speed: Unknown
Manufacturer: 
Serial Number: 
Asset Tag: 
Part Number: 
--//by www.ofstack.com
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: 
Set: 4
Locator: DIMM8 
Bank Locator: Not Specified
Type: 
Type Detail: Synchronous
Speed: Unknown
Manufacturer: 
Serial Number: 
Asset Tag: 
Part Number:

Then, use the free command to see the current memory usage:

# free -m 
total used free shared buffers cached
Mem: 4054 2963 1090 0 144 1272
-/+ buffers/cache: 1547 2506
Swap: 4094 0 4094