Adapted gnu3d.dem file for iozone to generate png files instead of postscript files. They are FullHD in size because it's 2017 and we don't like pixels anymore.

gnu3d.dem

#
# $Id: 3D plot of performance
#
# Processes files that were created by Generate_Graphs
# and displays the results. Also, saves a postscript copy.
#
# Don Capps

dirs = "write rewrite read reread randread randwrite bkwdread recrewrite strideread fwrite frewrite fread freread"
titles = "Write ReWrite Read Reread Random_read Random_write Read_Backwards Record_rewrite Stride_read Fwrite Frewrite Fread Freread"

file(n) = sprintf("%s/iozone_gen_out.gnuplot", word(dirs,n))
outfile(n) = sprintf("%s/%s.png size 1920,1080", word(dirs,n), word(dirs,n))
title(n) = word(titles,n)

set title "Iozone performance"
set grid lt 2 lw 1
set surface
set parametric
set xtics
set ytics
set logscale x 2
set logscale y 2
set xlabel "File size in 2^n KBytes"
set ylabel "Record size in 2^n Kbytes"
set zlabel "Kbytes/sec"
set style data lines
set dgrid3d 80,80,3

i = 1
set terminal x11
set output
splot file(i) title title(i)
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 2
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 3
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 4
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 5
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 6
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 7
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 8
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 9
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 10
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 11
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 12
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot

i = 13
set terminal x11
set output
replot
pause -1 "Hit return to continue"
set terminal png size 1920,1080
set output outfile(i)
replot