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I have recently found that modern TeX Live 2014 distribution has new LuaTeX engine luajittex. As far as I know this is just experimental however if we consider that luatex is beta version, almost everything about LuaTeX is still experimental. I compile my documents with lualatex using TeXstudio editor and it uses luatex engine by default, the compilation command line in Windows is:

lualatex.exe -synctex=1 -interaction=nonstopmode -shell-escape %.tex

Up to now the lualatex works perfectly and reliably for all my documents (usually I compile tex files to pdf).

I know that some people have reported that the luajittex has faster compilation time comparing to luatex. I would like to try new luajittex engine but I could not find any information how to change the default compilation engine.

What is a compilation command line if I want to use the luajittex engine in typical TeX-to-Pdf scenario?

Vladimir S.
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    luajittex --fmt=lualatex test.tex works for me in the sense that there is a resulting PDF. My installation keeps on regenerating the format file, I don't know why. – topskip May 21 '15 at 05:56
  • @topskip Thank you for your comment. I tried to compile the sample document but at the first attempt I got no pdf and the following message at the end of log: I can't find the format file `lualatex.fmt' but that was problem from my side with zero-length sample file, then after fixing the problem, the 2nd attempt was successful and I got the PDF file! – Vladimir S. May 21 '15 at 06:40
  • The problem I mentioned in my previous comment was not related to zero-length sample file. It seems that is the problem with TeX paths because the first attempt I did under Windows 7, and the second one - under Ubuntu 14.04. – Vladimir S. May 21 '15 at 07:00
  • @topskip: The default setting in TL15 disables the luajitlatex format in fmtutil.cnf, but you can enable it e.g. by creating a local fmtutil.cnf see http://www.preining.info/blog/2015/04/tex-live-the-new-multi-fmtutil/. Worked fine for me. – Ulrike Fischer May 21 '15 at 07:57
  • @UlrikeFischer: I am observing the same behaviour - each compilation with luajittex, it is regenerating the format file. How to stop it? I use TL2014 frozen. – Vladimir S. May 21 '15 at 08:54
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    Find your fmtutil.cnf with kpsewhich fmtutil.cnf. Open it and enable the luajitlatex format by removing the #!. Then create the format with fmtutil-sys --byfmt luajitlatex. Then you should be able to use luajitlatex test. – Ulrike Fischer May 21 '15 at 09:28
  • @UlrikeFischer: Thank you very much for your detailed instruction. I have a partial success. After completion of all of those commands, now I can compile a document with luajittex --fmt=luajitlatex test.tex command line so that the process is normal and no regeneration of format. However luajitlatex command is not found and I could not find any binary or script with such name, so I cannot do luajitlatex test right now. – Vladimir S. May 21 '15 at 14:51
  • @VladimirS.: add a link from luajittex to luajitlatex –  Sep 08 '15 at 14:32
  • It seems I'm missing luajitlatex in my Fedora repos of TL. Which version of TL started including luajitlatex? Sounds interesting to try it out sometime. – polemon Nov 24 '15 at 00:21
  • @polemon Linux TL distributions do not have the luajitlatex executable script by default. I have created myself something like exec luajittex --fmt=luajitlatex "$@" in bash script placed in TL binary path and made it executable. – Vladimir S. Nov 24 '15 at 04:17

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