CGAL users discussion list

["Laurent Rineau (GeometryFactory)" <>]

Le jeudi 03 février 2011 16:48:16, Samuel Hornus a écrit :

> Hi all,

>

> I'm using the CGAL surface mesher for meshing the surface of proteins.

> The results are excellent (see image), but I have a speed issue:

>

> - Linux, CGAL 3.7 : I get a surface with ~3600 vertices in ~2.1 seconds.

> - Windows 7, CGAL 3.7, exact same source code : exact same surface

> computed in between 30 and 53 seconds !!

>

> The code uses:

>

> // kernel and cells

> typedef

> CGAL::Robust_circumcenter_traits_3<CGAL::Exact_predicates_inexact_construct

> ions_kernel> K; typedef CGAL::Surface_mesh_vertex_base_3<K> Vb; typedef

> CGAL::Surface_mesh_cell_base_3<K> Cb; typedef

> CGAL::Triangulation_cell_base_with_circumcenter_3<K, Cb>

> Cb_with_circumcenter; typedef

> CGAL::Triangulation_cell_base_with_info_3<int, K, Cb_with_circumcenter>

> Cb_with_info;

>

> // triangulation

> typedef CGAL::Triangulation_data_structure_3<Vb, Cb_with_info> Tds;

> typedef CGAL::Delaunay_triangulation_3<K, Tds> Tr;

>

> // c2t3

> typedef CGAL::Surface_mesh_complex_2_in_triangulation_3<Tr> C2t3;

>

>

> Both are compiled with -DNDEBUG and -O2 (/O2).

What about the other compiler flags? On Linux, -O2 is not a flag used by CMake by default (it uses -O3 in Release mode), and maybe you have not used CMake to setup the compilation. Can you give us the exact compiler flags that were used on Linux and on Windows?

--

Laurent Rineau, PhD

R&D Engineer at GeometryFactory http://www.geometryfactory.com/

Release Manager of the CGAL Project http://www.cgal.org/