[Gmsh] Meshing is slow because Netgen is too verbose

[Christophe Geuzaine]

Hi Serban - Use "-v 3" ?

On 01 Aug 2012, at 14:39, Serban Georgescu <serbange at 09.alumni.u-tokyo.ac.jp> wrote:

> Hi guys,
> 
> I am have been using Gmsh for an year or so with very good results (and I am very grateful to the developers for the wonderful work).
> Recently, I switched to version 2.6 (from 2.5) and I found that for some of the models the meshing time is much increased.
> 
> The main reason for this is the large amount of output that Netgen generates.
> Basically, Netgen outputs loads of the following Info:
> 
> …
> Info    : Freezone:
> Info    : (0, 0, 0)
> Info    : (1.2, -5.5e-17, -3.1e-17)
> Info    : (-0.45, 1, 2.9e-18)
> Info    : (-2.3, 1.2, -0.31)
> Info    : (-0.54, 0.74, -0.1)
> Info    : (-0.96, 0.74, -0.1)
> Info    : (-0.38, 0.38, -0.1)
> Info    : Mapping found!!: Rule Tetrahedron Vis a Vis Point with 3 edges (1)
> Info    : 3 1 2 7
> Info    : 3 = 3
> …
> 
> Here are some results for one of the models:
> Gmsh 2.5 -> ~ 6 sec
> Gmsh 2.6 with output redirected to file à ~ 11 sec
> Gmsh 2.6 with output redirected to /dev/nullà ~ 8 sec
> Gmsh 2.6 with manually editingcontrib/Netgen/nglib_gmsh.cpp  by commenting line 75 (//testout = new ostream(new mystreambuf());) and un-commenting  line 66 (testout = new ofstream ("test.out");) à ~ 5 sec
> 
> So basically, in this case, the extra verbosity from netgen makes the mesher take twice as much.
> I have other cases where the increase is much larger.
> 
> My question (and wish) is:  would it be possible to connect this output to the Gmsh verbosity argument (-v)?
> I would be quite happy to (at least try to) add this functionality myself should somebody tell me how could I get access the verbosity value from contrib/Netgen/nglib_gmsh.cpp .
> 
> Thanks in advance,
> Serban
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine