[Gmsh] File size limit in gmsh?

[Christophe Geuzaine]

Christophe Trophime wrote:
> Hi,
> trying to create a mesh from a "template" geo file I append to notice
> that I cannot create mesh file larger than 2 Gb. As I run gmsh (1.65) on
> Linux FC5 I think that this limit is no longer due to the system (kernel
> 2.6.xx). Is this limitation really specific of gmsh?
> 

No. Do you run into this limit with a version you compiled on that 
machine, or with the stock pre-compiled version from the web site?

> I also wish to make gmsh able to write some other mesh file format
> (especially for freefem++ and some cfd codes like Dolfyn, gerris, ...) .
> Is there a simple way to tell 2D and 3D meshes when it comes to write
> the mesh data to file (the only way I find so far is to look for
> volumes). 

That's reasonable: Gmsh does not distinguish between 1D, 2D or 3D meshes.

> I also need to write the vertices nodes list as follows :
> 
> x y bc_id
> 
> How can I simply retrieve the boundary id (bc_id) for the vertices?

You'll have to write a new output routine. I would strongly encourage 
you to code it in the new code base if you actually do it: the whole 
output layer from 1.65 has been replaced in the upcoming Gmsh 2.0.




> 
> 
> Best regards
> 
> 
> 
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-- 
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine