[Gmsh] File size limit in gmsh?

[Christophe Geuzaine]

Christophe Trophime wrote:
> On Mon, 2006-10-09 at 19:21 -0400, Christophe Geuzaine wrote:
>> 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 use the source version of 1.65 and "limit" do not report limiation on
> the file size.

Maybe you have to pass special flags to the compiler to produce a 64 bit 
executable?

> 
>>> 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.
>>
>>
> 
> I have manage to produce BAMG mesh for freefem++ and it should also work
> for dolfyn. The only problem in this case is that you have to generate a
> file for the vertices, one for the "cells" and one for the boundaries.
> 

Don't hesitate to send a patch.




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