Hello Antoine,
Exporting in headless mode (all drivers but the default "Rec") is
fundamentally different from the default "Rec" mode where graphics are
actually rendered on screen on a joGL Canvas. In this case there is
virtually no overhead when exporting this Canvas to a bitmap image
format (png,jpeg,gif,...). In headless mode the rendering cannot use
joGL and there is the same overhead as when you try to export a figure
to a vectorial format (svg,pdf,eps) :
nx=4000;
ny=300;
nc=100;
x=1:nx;
y=[1:ny].';
z=(y*x);
driver Rec
h=scf();
h.color_map=hotcolormap(nc);
Sgrayplot(x,y,z.');
xs2pdf(h,"screen.pdf")
at line 13 of executed file /Users/mottelet/Desktop/xend_test.sce
xs2pdf: Unable to create export file, not enough memory. Decreasing the
number of elements or the size of the figure should fix this error.
S.
Le 03/12/2020 à 09:48, Antoine Monmayrant a écrit :
Hello all,
In these days of remote working, I need to use again scilab in
headless mode to generate graphics.
In other words, I connect in command line only to a remote server
where scilab is installed and I want it to generate graphics using a
combination of driver, xinit and xend.
There seems to be some issues with driver/xinit/xend: huge memory
overhead and long computation time that makes it impossible to
generate some plots in headless mode.
For example, a simple Sgrayplot that takes ~1 second to plot and save
to a png in normal mode takes more than 200 seconds and huge amount of
ram in headless mode (see attached test script).
I also have some plots that works without a problem in normal mode,
but fail in headless mode because of some memory limitation:
xend: An error occurred: Unable to create export file, not enough
memory. Decreasing the number of elements or the size of the
figure should fix this error.
Is there a way to get around these problems?
Thanks for your help,
Antoine
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--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet
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