how to monitor a processes memory usage over time - ubuntu [closed]

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I want to watch a given process in unix over time to see what time memory grows (its a long running job)开发者_StackOverflow社区

I guess I could do

ps -aux | grep PID

and run this from cron every 5 minutes, but it seems there should be a better way.

Is there a way I can use sar to do this?

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I use the following:

$ ps -o rss $(pgrep executablename)

Put that in a while loop or use watch to monitor it over time coupled with tail. You can also tee it to a file and have gnuplot plot it for you and refresh it every few seconds.