Q. How do I find out what process are eating up all my memory. Is it possible to find out how long that memory has been allocated to particular process? How do I kill that process to free up memory?
A. You need to use the top command which provides a dynamic real-time view of a running system. It can display system summary information as well as a list of tasks currently being managed by the Linux kernel.
Simply type top command:
# top
top command will tell you the percentage of physical memory a particular process is using at any given time. As far as I know, there is no easy way that can tell how long that memory has been allocated.
You can also use ps command to get more information about process.
# ps aux | less
To kill process use kill command under Linux. Read man page of top and ls for more information.
7 comment
i want to find the process execution time in LINUX???
time(command) | grep user|cut -f 2
My time command writes to stderr instead of stdout, so I had to use (time command) 2>&1 | grep user
I recommend using `htop’ instead of top to monitor processes. It’s much friendlier and easy to use, and allows you to do more. (It’s colorized too!)
It’s in the ubuntu repositories, I imagine you can install it easily for debian as well.
I prefer using atop.. which gives all the option network activity, disk activity and many more you can check in the man page of it
I dont know abt redhat and fedora but its there in ubuntu and debian repo
atop and htop will never work on fedora
what about this command:
ps axu | awk '{print $2, $3, $4, $11}' | head -1 && ps axu | awk '{print $2, $3, $4, $11}' | sort -k3 -nr |head -5The result is here
I see the 5 processes which consume most of the memory.
If I want to see the CPU, then I sort after second column => sort -k2
ps axu | awk '{print $2, $3, $4, $11}' | head -1 && ps axu | awk '{print $2, $3, $4, $11}' | sort -k2 -nr |head -5outputs: