How to generate large number of grain

[Parthasarathi9105]

I want to generate a large number of grains approx 70000, so i am using this command "neper -T -n from_morpho -dim 2 -domain "square(12,300)" -morpho voronoi -morpho "diameq:lognormal(0.25,0.03),1-circularity:lognormal(0.1,0.03)" -morphooptiini "coo:packing" -morphooptiobjective "diameq:ad,1-circularity:ad" -crysym cubic -orisampling uniform -oridescriptor euler-bunge -oriformat geof -regularization 1 -sel 0.00022 -format tess,ori -o can".........but after completing the seed setting 100% it shows the core dumped, and also seeds setting takes more time......so any one plese guide me how can I optimize it so that I can generate the required numbers of grains?