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Asked: 2026-06-15T22:32:07+00:00

I have a task which consumes arbit CPU and memory over time. It gives

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I have a task which consumes arbit CPU and memory over time. It gives me an output executing the following linux command:

mpstat -u 1 -P ALL

The output looks like:

02:22:14 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle
02:22:15 PM  all    4.51    0.00    0.11    0.00    0.00    0.00    0.00    0.00   95.37
02:22:15 PM    0    0.00    0.00    1.00    0.00    0.00    0.00    0.00    0.00   99.00
02:22:15 PM    1   **78.22**    0.00    0.99    0.00    0.00    0.00    0.00    0.00   20.79

02:22:15 PM    2    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
02:22:15 PM    3    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
02:22:15 PM    4    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM    5    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM    6    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
02:22:15 PM    7    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM    8    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM    9    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   10    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   11    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   12    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   13    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   14    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   15    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
02:22:15 PM   16    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   17    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   18    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   19    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
02:22:15 PM   20    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   21    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   22    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00
02:22:15 PM   23    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00

I want to grab the value located in 4th column and 3rd row a[3][4] i.e 78.22 every 20 seconds in bash/python/perl.
So the script I want, will execute the mpstat command and print out the value in the specified column and based on the values it creates a graph. I was thinking of appending the required value in a .dat file and run a gnuplot or and app which creates the graph.

Any suggestion on how to go?

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1 Answer

  1. Editorial Team

    You can get the 3rd row and 4th cell using awk. The following code grabs this cell from mpstat‘s output and appends it along with the current UNIX timestamp to a statistics file.

    mpstat -u 1 -P ALL | awk 'NR==4 {print systime(), $4}' >> stats.txt

    To run this command every 20 seconds:

    watch -n 20 "mpstat -u 1 -P ALL | awk 'NR==4 {print systime(), \$4}' >> stats.txt"

    Then plot with gnuplot:

    cat stats.txt | gnuplot -p -e 'set datafile separator " "; plot "-" using 1:2 with lines'
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