Linux free command explanation, linuxfree Interpretation

Linux free command explanation, linuxfree Interpretation

$ free -m              total       used       free     shared    buffers     cachedMem:         1002        769        232          0         62        421-/+ buffers/cache:        286        715Swap:         1153          0       1153

Part 1 Mem row:

• Total memory: 1002 MB
• Used memory used: 769 MB
• Free idle memory: 232 MB
• Shared is no longer used. It is always 0.
• Buffers Buffer cache memory: 62 MB
• Cached Page cache memory: 421 MB

Link: total (1002 M) = used (769 M) + free (232 M)

Part 2 (-/+ buffers/cache ):

• (-Buffers/cache) used memory size: 286 MB (refers to used-buffers-cached in the first part of the Mem row)
• (+ Buffers/cache) free memory: 715 MB (refers to the first part of the Mem row free + buffers + cached)

It can be seen that-buffers/cache reflects the memory actually eaten by the program, while + buffers/cache reflects the total number of memories that can be used.

I think you are still dizzy after reading the above. The first part (Mem) and the second part (-/+ buffers/cache) are so strange about used and free.

In fact, we can explain it in two ways.

• For the operating system, it is the Mem parameter. buffers/cached are all used, so it is considered that free is only 232.
• For applications (-/+ buffers/cach ). buffers/cached is equivalent to available, because buffer/cached is used to improve the performance of program execution. When the program uses memory, buffer/cached will be quickly used.