gnuplotcsv

#!/usr/bin/gnuplot

set datafile separator "," 
set title "CPU usage"
set xlabel "tick" 
set ylabel "percent"
set term png size 1024,1024
set key outside
set key right top

min(a,b) = a >= b ? b : a
samples(n) = min(int($0), n)
avg_data = ""

sum_n(data, n) = ( n <= 0 ? 0 : word(data, words(data) - n) + sum_n(data, n - 1))

avg(x, n) = ( avg_data = sprintf("%s %f", (int($0)==0)?"":avg_data, x), sum_n(avg_data, samples(n))/samples(n)) 


set output "dstat-mvavg.png"
plot "dstat.csv" using 0:(avg(column(2), 10)) every 10::4 title "system" with lines, \
"dstat.csv" using 0:(avg(column(1), 10)) every 10::4 title "user" with lines

set output "dstat.png"
plot "dstat.csv" using 0:2 every 10::4 title "system" with lines, \
"dstat.csv" using 0:1 every 10::4 title "user" with lines