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How to see the memory usage of a process?
The ps command includes a column that displays memory usage for each process. To get the most useful display for viewing the top memory users, however, you can pass the ps output from this command to the sort command. Here’s an example that provides a very useful display:
Which is the best command to check memory usage?
Note: As with most commands, entering man free displays an overview of all variations and descriptions of the results. The vmstat command is a useful tool that reports virtual memory statistics. vmstat provides general information about processes, memory, paging, block IO, traps, and CPU activity.
How to rank processes by memory usage in Linux?
Just add a username with the -U option as shown below and press the shift+m keys to order by memory usage: You can also use a ps command to rank an individual user’s processes by memory usage. In this example, we do this by selecting a single user’s processes with a grep command:
How to report on memory usage on Linux?
There are a lot of ways to report on memory usage on Linux. Focusing on which processes and users are consuming the most memory can benefit from a few carefully crafted tools and commands. Join the Network World communities on Facebook and LinkedIn to comment on topics that are top of mind.
Why is only 2% of memory used for caching?
In short, the data presented is not ‘in sync’ with the ‘pain’ moments – although it might explain why only 2.2% of your memory is now used for caching (it may even be ‘computational aka the loaded programs’).
Where does permanent memory go when paged out?
Permanent memory is file cache. If that needs to be paged out, it goes back out to the filesystem where it came from (for dirty pages, clean pages just get recycled). This is subdivided into non-client (or persistent) pages for JFS filesystems, and client pages for JFS2, NFS, and possibly others.
What kind of memory is in the kernel?
Working memory is process (stack, heap, shared memory) and kernel memory. If that sort of memory needs to be pages out, it goes to swap. Permanent memory is file cache.