> On 7 Dec 2017, at 18:41, Pablo Antolin <pablo.anto...@epfl.ch> wrote: > > Hello everybody, > > I am using Gmsh inside my own code, through the API, to mesh a lot of very > small geometries that are independent one from the other. My goal is to > produce for every geometry the coarsest mesh possible. > > In order to speedup the process, I've tried to create a single GModel for > every geometry and to process them in parallel (using openmp). However, due > to certain runtime errors I am getting, it seems that either I am doing > something wrong in my code or it is not thread-safe to create multiple > instances of the GModel class and to work with them in parallel.
GModel is not yet thread-safe. It might be eventually, but it's best for now to use multi-threading *inside* GModel - you can test by enabling OpenMP support and setting e.g. "-nt 8" on the command line. More comprehensive multi-threading support will arrive after we release the first stable API in Gmsh 4.0. PS : you should probably not use the internal classes directly. Have a look at the new API instead (see gmsh/api and gmsh/demos/api). > > On the other hand, I've seen that Gmsh offers multithreading parallelization. > My question is: can I benefit from that? > If different regions (corresponding to different geometries) are meshed in > parallel, my code would speedup; if the parallelism is perform inside the > mesh process of every region/geometry, probably the code would remain mostly > serial. > > After meshing all the geometries, I check them, looking for possible negative > jacobians. For the ones that present negative jacobians I either refined them > or use the high-order optimization algorithm. But this process is only > executed for the geometries presenting negative jacobians. > > So, my second question is: after meshing the first GModel (hopefully in > parallel), can I remove or deactivate some of the regions / elements (present > in the first GModel) that are already valid (their jacobians are positive > everywhere)? Then, I would refine/optimize only the ones that present > negative jacobians. > > > Thanks for the support. > Best regards, > > > -- > > Pablo Antolin > Researcher > Chair of Numerical Modelling and Simulation > Institute of Mathematics > Ecole polytechnique fédérale de Lausanne > > > _______________________________________________ > gmsh mailing list > gmsh@onelab.info > http://onelab.info/mailman/listinfo/gmsh -- Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine Free software: http://gmsh.info | http://getdp.info | http://onelab.info _______________________________________________ gmsh mailing list gmsh@onelab.info http://onelab.info/mailman/listinfo/gmsh
