linux - how to monitor a processes memory usage over time - ubuntu -

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I want to see the process given in Unix over time, how the time memory increases (this is a long lasting Work)

I think I can 

  ps -aux | Grep PID   
 Run it from the cron every 5 minutes, but it seems that there should be a better way.  
 Can I use Sir to do this?   
 
 
 I use it:  
  $ ps -o rss $ (Pgrep executablename)   
 Put the clock in a loop at a time or use the clock to keep track of time with the tail. You can also tee it in a file and Gnuplot can plot it for you and refresh every few seconds.

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