Extracting CPU use for specific process periodically

Question

I have a running demo on a Linux server which consumes quite a bit of CPU and Memory usage. These parameters keep changing based on the load of the running demo. I want to extract the CPU usage and Memory usage periodically , i.e. every 3-4 sec and create a plot of the extracted result.

Considering the process as " Running Demo", on the terminal I typed:

ps aux |grep Running Demo | awk '{print $3 $4}'

This gives me the CPU and Memory usage of Running Demo. But I want the next two things i.e. 1) get this result outputted every 3-4 sec. 2) Make a plot of the generated result.

Any help or suggestion will be highly appreciated. I am a starter in this community.

Thanks

Answer 1

What you are trying to do is well known as an existing project :

See Munin

EXAMPLE

NOTE

• it's supported by the Open Source community, so...
• it will be stronger
• don't run odd commands like ps aux |grep Running Demo | awk '{print $3 $4}' but ps auxw | awk '/Running Demo/{print $3 $4}'
• many plugins exists and works for basics : CPU, RAM, FW, Apache and many more
• if you really need gnuplot, see a top 3 on a goggle search http://blah.token.ro/post/249956031/using-gnuplot-to-graph-process-cpu-usage