Check the resource (cpu, memory) usage of users – Linux

In some high load situations, we need to find out the resource consumption of each users on the server to figure out the exact issue.

There are a lot of options/commands available in Linux to find the same. Normally, we use the “ps” and “top” commands.

Separating or sorting Unix user with their own resource usage is quit hard for a beginner.  The command PS has a lot of switches for sorting processes in different manner.

We can simply sort the current executing processes with its CPU and Memory conception ratio. Also, here is a simple link for monitoring your server load “Load monitoring in Linux servers

ps command” and “top command” have a lot of options, here I am explaining some useful command combinations to find the resource(cpu, memory…) usages of users in the server.

Static View

It’s simply a static output of current resource usage in the server. You can use the grep command to separate users. 🙂

To list top 10 CPU usage processes with user

# ps -e -o pcpu,pid,user,args|sort -k1 -nr|head -10

Find out top 10 CPU consuming process

# ps -auxf|sort -nr -k3|head -10

To list top 10 Memory consuming processes with user

# ps -e -o pmem,pid,user,args|sort -k1 -nr|head -10

Find out the top 10 memory consuming process

# ps -auxf|sort -nr -k4|head -10

Find out every process running under a user

# ps -U user-name -u user-name u

Or

# ps -e -o pid,user,args|grep $username

Dynamic View

To get a dynamic result you must use the ‘top‘ command instead of ‘ps’ or use the ‘watch‘ command along with the ‘ps’.

To show the process usage of a user with ‘top’

# top -u $username

You can refer this “How to show process usage for single user with TOP command” for more details.

To list top 10 CPU usage processes with user

# watch "ps -e -o pcpu,pid,user,args|sort -k1 -nr|head -10"

To list top 10 Memory consuming processes with user

# watch "ps -e -o pmem,pid,user,args|sort -k1 -nr|head -10"

You can use the grep command to separate users. 🙂

Must try this and comment your suggestions.

Related links:

PS command usage with example (Unix/Linux)
Top command usages and examples in Unix/Linux
How to show process usage for single user with TOP command

 

Load monitoring in Linux servers – top, w and uptime commands’ usage for checking the load on server

This is a necessary thing to check the load-average on your server for its better and stable performance.

In a Linux server/system we can check the load by different ways.

High load on the server cause performance degrade. That means if you have a shared server with overload, the website on that server will load slowly normally.

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Arunlal Ashok

Linux Systems Architect at Endurance International Group. I know her (Linux) since many years. Linux lover. Like to play on Linux console. I started this blog to share and discuss Linux thoughts.

Always happy for an open discussion! Write to arun (@) crybit (dot) com. Check about me for more details. About this blog and our strong members, check The team CryBit.com

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