Is there any way to monitor one process' CPU usage and RAM usage over time on linux? I am trying to change to a cheaper VPS and need to work out what level of CPU and RAM I need!
3 Answers
read man 5 proc
, especially the /proc/[pid]/stat
entry and the utime
, stime
fields. /proc/[pid]/status
or /proc/[pid]/statm
might be of interest for you as well.
then use cron
or whatever means needed to collect 'snapshots' of /proc/[pid]/stat
for your process over a period of time. then visualize what you have grabbed.
a simple 'collector' works like this (for a process with the pid '29777'):
% while true; do cat /proc/29777/stat; sleep 1; done
to make life easier, you could also use the systat package which includes several means to collect data over time:
http://sebastien.godard.pagesperso-orange.fr/documentation.html
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Sounds an interesting idea, i'll give it a go and update you with the result. Nov 16, 2010 at 18:57
pidstat is a very good tool for the cpu part of your question.
http://xmodulo.com/2012/08/how-to-measure-average-cpu-utilization.html
top
command should give you all the info you need.
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2Top only provides instantaneous snapshots of CPU and memory usage. The OP asks how to collect aggregate statistics over time. Nov 15, 2010 at 0:49