以前已经提过多次gnuplot的简便快捷了。不过大多是最基本的单图上画条线之类的。这次碰到需求，稍微help了一下在一个图上画多个区域。主要需要注意的就是set size的定位点到底从什么角度算，说实话蛮麻烦的。
上文件：
result=$1
begin=`head -n 1 $result.txt | awk '{print $1}'`
end=`tail -n 1 $result.txt | awk '{print $1}'`
cat > conf/$result.conf <<EOF
set terminal png
set output "png/$result.png"
set multiplot
set xdata time
set timefmt "%H:%M:%S"
set format x "%M:%S"
set size 1.0,0.5
set origin 0.0,0.5
set ylabel "KRps"
unset xtics
plot "res/$result.txt" using 1:($2/1000) with points linewidth 2 title ""
set origin 0.0,0.0
set size 1.0,0.35
set xtics
set xrange ["$begin":"$end"]
set ylabel "%usr:sys:irq"
plot "res/$result.csv" using 2:($3+$4+$8) with boxes fs solid 1.0 title "",
"res/$result.csv" using 2:($3+$4) with boxes fs solid 1.0 title "",
"res/$result.csv" using 2:3 with boxes fs solid 1.0 title ""
set origin 0.0,0.3
set size 1.0,0.25
unset xtics
set ylabel "MBps"
plot "res/$result.csv" using 2:($11/1024/1024) with boxes fs solid 0.7 linecolor rgb "green" title "",
"res/$result.csv" using 2:($12/1024/1024) with lines linewidth 2 linecolor rgb "blue" title ""
EOF
cat conf/$result.conf | gnuplot
注意：新增了一行xrange配置，如果不指定这个几张小图的xtics会不统一，而上面两张图的xtics又已经被unset了，结果看起来就跟不同步似的。
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