What does OOM killer kill?

While you might think this should not be a problem, the OOM Killer kills processes that the server has deemed non-essential, not the user. For example, the two applications the OOM Killer usually kills first are Apache® and MySQL® because they use a large amount of memory.

How does OOM killer work in Linux?

The Out Of Memory Killer or OOM Killer is a process that the linux kernel employs when the system is critically low on memory. This situation occurs because the linux kernel has over allocated memory to its processes. When a process starts it requests a block of memory from the kernel.

How does OOM killer decide which process to kill?

How does OOM Killer choose which process to kill? The Linux kernel gives a score to each running process called oom_score which shows how likely it is to be terminated in case of low available memory. The score is proportional to the amount of memory used by the process.

What is an OOM?

Oom is the style of calling a male person as an uncle.

Which process is using the most memory Linux?

Checking Memory Usage Using ps Command:

1. You can use the ps command to check memory usage of all the processes on Linux.
2. You can check memory of a process or a set of processes in human readable format (in KB or kilobytes) with pmap command.
3. Let’s say, you want to check how much memory the process with PID 917 is using.

What caused OOM killer?

About the OOM Killer In certain situations, the root cause of the issue can be traced to the system running low on memory and killing an important process in order to remain operational. The Linux kernel allocates memory upon the demand of the applications running on the system.

How do you trigger OOM killer?

the required command key to invoke OOM killer is “f” which is mentioned in documentation as, ‘f’ – Will call the oom killer to kill a memory hog process, but do not panic if nothing can be killed.

What is oom agile?

OOM is a system development approach encouraging and facilitating re-use of software components. With this methodology, a computer system can be developed on a component basis which enables the effective re-use of existing components and facilitates the sharing of its components by other systems.