What does RSS mean in PS?
Resident Set Size
There are two columns in the output of the ps command that don’t get talked about a lot. These are the VSZ (Virtual Memory Size) and RSS (Resident Set Size) columns. Both columns give us information about how much memory a process is using.
What does VSZ stand for Linux?
Virtual Memory Size
VSZ is short for Virtual Memory Size. It’s the total amount of memory a process may hypothetically access. It accounts for the size of the binary itself, any linked libraries, and any stack or heap allocations. When a process is started, VSZ memory becomes RSS memory, over which we’ll go now.
What’s the difference between VSZ and RSS columns?
VSZ and RSS columns in the ps command output VSZ is Virtual Memory Size. This is the size of memory that Linux has given to a process, but it doesn’t necessarily mean that the process is using all of that memory. For example, many applications have functions to carry out certain tasks, but may not load them into memory until they are needed.
Why does BusyBox top calculate% MEM as VSZ instead of RSS?
It looks like busybox top calculates %MEM as VSZ / MemTotal instead of RSS / MemTotal. It is likely that rstpd has a lot of dynamic libraries linked to it, but they have not been loaded into memory yet. See Why the value of VSIZE in top is different from the value of VSZ (Virtual set size) in ps?
What do top’s% Mem and VSZ mean?
%MEM — Memory usage (RES) A task’s currently used share of available physical memory. How can this process consume more than 100% memory? And if it’s such a memory hog, why are there still 88564K RAM free on the system? The man page you refer to comes from the procps version of top.
What does VSZ mean for memory in Linux?
VSZ is Virtual Memory Size. This is the size of memory that Linux has given to a process, but it doesn’t necessarily mean that the process is using all of that memory. For example, many applications have functions to carry out certain tasks, but may not load them into memory until they are needed.