Memory management

One of the features of OpenVZ is that it allows you to manage the memory allocation to the containers on a very fine-tuned level and allows you to fully control memory resources on the node.

vzmemcheck

You can use vzmemcheck to check the amount of memory that is currently being used by the server and also by each individual container. Using vzmemcheck on its own will give you the memory usage that is currently being used by the entire server. This is shown in the following screenshot:

In the previous example, we used the vzmemcheck command with no options or flags to display the current memory that is being used by the server.

LowMem

LowMem is the part of memory that is directly available by the OS kernel.

MemSwap

MemSwap is a joining of both the physical memory and swap on the server. This determines the total amount of memory that is available for applications.

Allocated

Allocated memory shows the total amount of memory that is currently allocated for use for future processes...