How to view memory information in Linux

When we run the free command to view the idle memory of the machine, we will find that the free value is very small. This is mainly because there is such an idea in linux, the memory does not need to be white, so it tries its best to cache and buffer some data. The following is a command to view the memory for your reference.
 

1. in Linux, check the number of memory slots, the number of slots used, the size of each memory, and the size of memory used
 

 
 

  
  
dmidecode|grep-P-A5"Memory\s+Device"|grepSize|grep-vRange  
  
  
Size:2048MB  
  
  
Size:2048MB  
  
  
Size:NoModuleInstalled  
  
  
Size:NoModuleInstalled  
  
  
Size:NoModuleInstalled  
  
  
Size:NoModuleInstalled  
  
  
Size:NoModuleInstalled  
  
  
Size:NoModuleInstalled  
 
 

2. Check the maximum memory capacity supported by the memory in Linux.
 

 
 

  
  
dmidecode|grep-P'Maximum\s+Capacity'  
  
  
MaximumCapacity:64GB  
 
 

3. Linux memory viewing frequency
 

 
 

  
  
dmidecode|grep-A16"MemoryDevice"  
  
  
dmidecode|grep-A16"MemoryDevice"|grep'Speed'  
  
  
Speed:667MHz(1.5ns)  
  
  
Speed:667MHz(1.5ns)  
  
  
Speed:667MHz(1.5ns)  
  
  
Speed:667MHz(1.5ns)  
  
  
Speed:667MHz(1.5ns)  
  
  
Speed:667MHz(1.5ns)  
  
  
Speed:667MHz(1.5ns)  
  
  
Speed:667MHz(1.5ns)