[Scilab-users] Headless graphics in scilab: time & memory issues

[Stéphane Mottelet]

The xmllab is actually still working, try e.g.

http://marguerite.lmac.utc.fr/~xmllab/cgi-bin/XMLlabServer.cgi?timing=no&lang=english&simulation=/home/xmllab/scilab-5.5.2/share/scilab/contrib/xmllab/1.7.6//examples/Image-Processing/clown.xml&action=launch

S.

Le 03/12/2020 à 11:20, Stéphane Mottelet a écrit :
>
> Le 03/12/2020 à 11:01, Antoine Monmayrant a écrit :
>>
>> On 03/12/2020 10:46, Stéphane Mottelet wrote:
>>> 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) :
>>
>>
>> OK thanks for the clarification.
>> That's a weird and unexpected limitation, no?
>
> No. In fact fast offscreen rendering is possible in joGL. In my 
> previous answer I should have said "In headless mode the rendering 
> *does not* use joGL". The pity is that the main author of Scilab 
> Graphics Java backend has left the team long time ago. It would have 
> been an easy task for him.
>
> If your project is hosted on a Linux server, I would advise you to 
> redirect the display of your Scilab instance to a virtual frame buffer 
> by using any flavor of VNC (TurboVNC is nice as the server can use the 
> hardware GPU capabilities of the server). In this case you can stick 
> to the Rec driver and j xs2png (or any bitmap variant) will be fast. 
> That's what I used with xmllab many years ago...
>
> S.
>
>> I would not have guessed that going headless and using a bitmap 
>> format would result in facing this limitation.
>> Moreover, there is still a memory issue as I can crash scilab when 
>> pushing things a bit further.
>>
>> 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