RedhatLinuxAS4 memory usage

First, the principle of memory usage in Linux is to "maximize the use of physical memory". During the running process, the frequently used data is stored in the memory as much as possible to be used for the next time. How is the application's available memory calculated: # free-mtotalusedfreesharedbufferscachedMem: 10009001000350350-/+ buffers/cache: 200800 in this example, the application

First, the principle of memory usage in Linux is to "maximize the use of physical memory". During the running process, the frequently used data is stored in the memory as much as possible to be used for the next time.

How is the application's available memory calculated:

# Free-m

Total used free shared buffers cached

Mem: 1000 900 100 0 350 350

-/+ Buffers/cache: 200 800

In this example, the application only uses MB of memory and MB of idle memory.

Some simple calculation methods:

Physical memory used = actual memory used-buffer-Cache

Physical idle memory = total physical memory-actually used memory + buffer + Cache

Available idle memory for applications = total physical memory-actually used memory

Application memory used = actual memory used-buffer-Cache