Microtype causes error in combination with system call LuaLaTeX

Question

I'm trying to plot some figures based on measurements with tikz because the number of data points is to large for LaTeX I'm using a 'system call' to use LuaLaTeX for them.

As long I do not load microtype everything works pretty well but for some reason microtype seems to cause an error. Any ideas?

TeX capacity exceeded, sorry [main memory size=3000000]. \end{axis}

\documentclass[fontsize=12pt]{scrreprt}

\usepackage[english,ngerman]{babel}% neue deutsche Rechtschreibung verwenden
\usepackage[T1]{fontenc}            % Wahl des Fonts, bzw.
\usepackage[utf8]{inputenc} % Zeichkodierung , Umlaute \usepackage{}


%\usepackage[activate={true,nocompatibility},final,tracking=true,kerning=true,spacing=true,factor=1100,stretch=10,shrink=10]{microtype}

\usepackage[activate={true,nocompatibility},
            final,
            tracking=true,
            kerning=true,
            spacing=true,
            factor=1200,
            stretch=50,
            shrink=0]{microtype}

      \usepackage{tikz,pgfplots}
      \pgfplotsset{compat=newest}
      \pgfplotsset{plot coordinates/math parser=false}
      \pgfplotsset{every axis/.append style={
            /pgf/number format/.cd,
            use comma,
            1000 sep={},
            set decimal separator={,},
            clip marker paths=true,
            grid style={densely dotted, draw=black},
            x tick style={color=black},
            y tick style={color=black},
        }}
        \usetikzlibrary{plotmarks}
        \usetikzlibrary{patterns}      

        \newlength\figureheight
        \newlength\figurewidth

        \usetikzlibrary{external}
        \tikzexternalize[prefix=tikztmp/,figure name=tikztmp_sec\thesubsection_no,]
        \tikzset{external/system call={lualatex \tikzexternalcheckshellescape -halt-on-error -interaction=batchmode -jobname "\image" "\texsource"}}
        \tikzexternalize[shell escape=-enable-write18]


\begin{document}

\begin{figure}
\microtypesetup{kerning=false}
\microtypesetup{spacing=false}
\microtypesetup{expansion=false}
\microtypesetup{protrusion=false}
\microtypesetup{activate=false}
\microtypesetup{disable}    
\begin{tikzpicture}
\begin{axis}[%
width=5cm,
height=10cm,
at={(0.790898in,0.967508in)},
scale only axis,
xlabel={$x~\rightarrow$},
ylabel={$y~\rightarrow$},
legend style={legend cell align=left,align=left,draw=black}
]
\addplot [color=gray,line width=.45pt,mark size=.45pt,only marks,mark=*,mark options={solid}]
table [ x expr=\thisrow{tmess}*1e6, y=uoutmess, col sep=comma] {tmessuoutmess.csv};
\addlegendentry{Messung};

\addplot [color=black,solid,line width=1.5pt]
table [x expr=\thisrow{tapprox}*1e6, y=uoutapprox, col sep=comma] {tapproxuoutapprox.csv};
\addlegendentry{Approximation};

\addplot [color=black,loosely dotted,line width=1.5pt]
table [x expr=\thisrow{tsim}*1e6,y=uoutsim, col sep=comma] {tsimuoutsim.csv};
\addlegendentry{Simulation};
\end{axis}
\end{tikzpicture}
\microtypesetup{enable}
\microtypesetup{activate=true}
\microtypesetup{protrusion=true}
\microtypesetup{expansion=true}
\microtypesetup{spacing=true}
\microtypesetup{kerning=true}
\end{figure}

\end{document}  

Values: enter link description here

Furthermore, I'm using:

MiKTeX 2.9 64-bit
pdfTeX, Version 3.14159265-2.6-1.40.15
LuaTeX, Version beta-0.76.0-2013062821

---

edit: Because LuaLateX does not support spacing and kerning I tried to disable this features for the tikzpicture environment but it seems not to work any ideas?

\microtypesetup{kerning=false}
\microtypesetup{spacing=false}
\begin{tikzpicture}
...
\end{tikzpicture}
\microtypesetup{spacing=true}
\microtypesetup{kerning=true}

Answer 1

Load the ifluatex-package and use it to deactivate settings not allowed or useful for lualatex:

\usepackage{ifluatex}
\usepackage[activate={true,nocompatibility},
            final,
            tracking=true,
            %kerning=true,
            %spacing=true,
            factor=1200,
            stretch=50,
            shrink=0, 
            ]{microtype}
\ifluatex \else \microtypesetup{kerning=true,spacing=true}\fi 

Answer 2

The manual of microtype says that kerning and spacing work only with pdfTeX. So try with

...,kerning=false,spacing=false,...

I have confirmed that

pdflatex --shell-escape filename.tex

works.